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Journal articles on the topic 'Central Gawler Gold Province'

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Published: 10 December 2022
Last updated: 28 January 2023

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1

BUDD, A. R., and G. L. FRASER. "Geological relationships and 40Ar/39Ar age constraints on gold mineralisation at Tarcoola, central Gawler gold province, South Australia." Australian Journal of Earth Sciences 51, no. 5 (October 2004): 685–99. http://dx.doi.org/10.1111/j.1400-0952.2004.01084.x.

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2

Budd, A. R., and R. G. Skirrow. "The Nature and Origin of Gold Deposits of the Tarcoola Goldfield and Implications for the Central Gawler Gold Province, South Australia." Economic Geology 102, no. 8 (December 1, 2007): 1541–63. http://dx.doi.org/10.2113/gsecongeo.102.8.1541.

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3

Pankhurst, M. J., B. F. Schaefer, P. G. Betts, N. Phillips, and M. Hand. "A mesoproterozoic continental flood rhyolite province, the Gawler Ranges, Australia: the end member example of the Large Igneous Province clan." Solid Earth Discussions 2, no. 2 (September 9, 2010): 251–74. http://dx.doi.org/10.5194/sed-2-251-2010.

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Abstract. Rhyolite and dacite lavas of the Mesoproterozoic upper Gawler Range Volcanics (GRV) (>30 000 km3 preserved), South Australia, represent the remnants of one of the most voluminous felsic magmatic events preserved on Earth. Geophysical interpretation suggests eruption from a central cluster of feeder vents which supplied large-scale lobate flows >100 km in length. Pigeonite inversion thermometers indicate eruption temperatures of 950–1100 °C. The lavas are A-type in composition (e.g. high Ga/Al ratios) and characterised by elevated primary halogen concentrations (~1600 ppm Fluorine, ~400 ppm Chlorine). These depolymerised the magma such that temperature-composition-volatile non-Arrhenian melt viscosity modelling suggests they had viscosities of <3.5 log η (Pa s). These physicochemical properties have led to the emplacement of a Large Rhyolite Province, which has affinities in emplacement style to Large Basaltic Provinces. The low viscosity of these felsic magmas has produced a unique igneous system on a scale which is either not present or poorly preserved elsewhere on the planet. The Gawler Range Volcanic Province represents the erupted portion of the felsic end member of the family of voluminous, rapidly emplaced terrestrial magmatic provinces.
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4

Pankhurst, M. J., B. F. Schaefer, P. G. Betts, N. Phillips, and M. Hand. "A Mesoproterozoic continental flood rhyolite province, the Gawler Ranges, Australia: the end member example of the Large Igneous Province clan." Solid Earth 2, no. 1 (March 31, 2011): 25–33. http://dx.doi.org/10.5194/se-2-25-2011.

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Abstract. Rhyolite and dacite lavas of the Mesoproterozoic upper Gawler Range Volcanics (GRV) (>30 000 km3 preserved), South Australia, represent the remnants of one of the most voluminous felsic magmatic events preserved on Earth. Geophysical interpretation suggests eruption from a central cluster of feeder vents which supplied large-scale lobate flows >100 km in length. Pigeonite inversion thermometers indicate eruption temperatures of 950–1100 °C. The lavas are A-type in composition (e.g. high Ga/Al ratios) and characterised by elevated primary halogen concentrations (~1600 ppm fluorine, ~400 ppm chlorine). These depolymerised the magma such that temperature-composition-volatile non-Arrhenian melt viscosity modelling suggests they had viscosities of <3.5 log η (Pa s). These physicochemical properties have led to the emplacement of a Large Rhyolite Province, which has affinities in emplacement style to Large Basaltic Provinces. The low viscosity of these felsic magmas has produced a unique igneous system on a scale which is either not present or poorly preserved elsewhere on the planet. The Gawler Range Volcanic Province represents the erupted portion of the felsic end member of the family of voluminous, rapidly emplaced terrestrial magmatic provinces.
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5

Fraser, G. L., R. G. Skirrow, A. Schmidt-Mumm, and O. Holm. "Mesoproterozoic Gold in the Central Gawler Craton, South Australia: Geology, Alteration, Fluids, and Timing." Economic Geology 102, no. 8 (December 1, 2007): 1511–39. http://dx.doi.org/10.2113/gsecongeo.102.8.1511.

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6

Reid, Anthony. "The Olympic Cu-Au Province, Gawler Craton: A Review of the Lithospheric Architecture, Geodynamic Setting, Alteration Systems, Cover Successions and Prospectivity." Minerals 9, no. 6 (June 20, 2019): 371. http://dx.doi.org/10.3390/min9060371.

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The Olympic Cu-Au Province is a metallogenic province in South Australia that contains one of the world’s most significant Cu-Au-U resources in the Olympic Dam deposit. The Olympic Cu-Au Province also hosts a range of other iron oxide-copper-gold (IOCG) deposits including Prominent Hill and Carrapateena. This paper reviews the geology of the Olympic Cu-Au Province by investigating the lithospheric architecture, geodynamic setting and alteration systematics. In addition, since the province is almost entirely buried by post-mineral cover, the sedimentary cover sequences are also reviewed. The Olympic Cu-Au Province formed during the early Mesoproterozoic, ca. 1.6 Ga and is co-located with a fundamental lithospheric boundary in the eastern Gawler Craton. This metallogenic event was driven in part by melting of a fertile, metasomatized sub-continental lithospheric mantle during a major regional tectonothermal event. Fluid evolution and multiple fluid mixing resulted in alteration assemblages that range from albite, magnetite and other higher temperature minerals to lower temperature assemblages such as hematite, sericite and chlorite. IOCG mineralisation is associated with both high and low temperature assemblages, however, hematite-rich IOCGs are the most economically significant. Burial by Mesoproterzoic and Neoproterozoic-Cambrian sedimentary successions preserved the Olympic Cu-Au Province from erosion, while also providing a challenge for mineral exploration in the region. Mineral potential modelling identifies regions within the Olympic Cu-Au Province and adjacent Curnamona Province that have high prospects for future IOCG discoveries. Exploration success will rely on improvements in existing potential field and geochemical data, and be bolstered by new 3D magnetotelluric surveys. However, drilling remains the final method for discovery of new mineral resources.
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7

LÝ, NGỌC-SÂM, and HANS-JUERGEN TILLICH. "Aspidistra cadamensis (Asparagaceae), a new species from Central Vietnam." Phytotaxa 303, no. 1 (April 7, 2017): 84. http://dx.doi.org/10.11646/phytotaxa.303.1.8.

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The genus Aspidistra Ker Gawler (1822: 628) is represented in tropical and subtropical SE Asia by more than 160 species. It has the highest diversity in southern China and northern Vietnam (Tillich 2005, 2014, Tillich & Averyanov 2012, Vislobokov et al. 2013). In Vietnam, more than 50 species are known: many species have been discovered from the limestone regions in North Vietnam, while about 21 species are found from sandstone forests in Central and South Vietnam (Gagnepain 1934, Bogner & Arnautov 2004, Bräuchler & Ngoc 2005, Averyanov & Tillich 2012, 2013, 2016a, 2016b, Averyanov et al. 2016, Tillich 2005, 2014, Tillich & Averyanov 2008, Tillich et al. 2007, Leong-Škorničková et al. 2014, Vislobokov 2015, Vislobokov et al. 2013, 2014b, 2014c, 2016a, 2016b, Lý & Tillich 2016). During extensive floristic surveys in Central Vietnam in 2016, several interesting specimens of Aspidistra were collected by the first author. The critical examination of these specimens and study of literature for Aspidistra in Vietnam and neighbouring countries allowed to evidence several new taxa, two of which have been recently described: A. averyanovii Lý & Tillich (2016: 54) and A. parviflora Lý & Tillich (2016: 56). In the present paper, we describe a further new species from Cà Đam mountains, Quảng Ngãi Province, namely Aspidistra cadamensis.
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8

van der Hoek, B. G., S. M. Hill, and Robert C. Dart. "Calcrete and plant inter-relationships for the expression of concealed mineralization at the Tunkillia gold prospect, central Gawler Craton, Australia." Geochemistry: Exploration, Environment, Analysis 12, no. 4 (November 2012): 361–72. http://dx.doi.org/10.1144/geochem2011-115.

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9

Mel’nikov, A. V., V. A. Stepanov, and V. G. Moiseenko. "Metallogenic zones in the central segment of the Amur gold-bearing province." Doklady Earth Sciences 458, no. 1 (September 2014): 1058–62. http://dx.doi.org/10.1134/s1028334x14090190.

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10

Reid, Anthony J., and Adrian Fabris. "Influence of Preexisting Low Metamorphic Grade Sedimentary Successions on the Distribution of Iron Oxide Copper-Gold Mineralization in the Olympic Cu-Au Province, Gawler Craton." Economic Geology 110, no. 8 (November 9, 2015): 2147–57. http://dx.doi.org/10.2113/econgeo.110.8.2147.

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11

Scarpelli, Wilson, and Élio Hiromi Horikava. "Gold, iron and manganese in central Amapá, Brazil." Brazilian Journal of Geology 47, no. 4 (December 2017): 703–21. http://dx.doi.org/10.1590/2317-4889201720170114.

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ABSTRACT: Greenstone belts with deposits of gold, iron and manganese are common in the Paleoproterozoic Maroni-Itacaiunas Tectonic Province of the Guiana Shield. In Brazil, in the State of Amapá and northwest of Pará, they are represented by the Vila Nova Group, constituted by a basal unit of metabasalts, covered by metasediments of clastic and chemical origin. The basal metasediments, the Serra do Navio Formation, are made of a cyclothem with lenses of manganese marbles at the top of each cycle. Under the intense weathering of the Amazon, these lenses were oxidized to large deposits of high-grade manganese oxides. The exploitation of these oxides left behind the manganese carbonates and low-grade oxides. The overlaying Serra da Canga Formation presents a calcium and magnesium domain grading to an iron domain with banded silicate and oxide iron formations, mined for iron ores. Overlapping structures and superposed metamorphic crystallizations indicate two phases of dynamothermal metamorphism, the first one with axis to north-northeast and the second one to northwest, with an intermediate phase of thermal metamorphism related to syntectonic granitic intrusions. Shears oriented north-south, possibly formed during the first dynamothermal metamorphism and reactivated in the second, are ideal sites for hydrothermalism and gold mineralization, which is greater when occurs in iron formation and carbonate-bearing rocks, as it happened at the Tucano mine. Layered mafic-ultramafic intrusions in the greenstones represent a potential for chromite and platinum group elements. Pegmatites are source of cassiterite and tantalite exploited from alluvial deposits.
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12

Lugra, I. Wayan, and Udaya Kamiludin. "INDICATION OF GOLD AND SILVER OCCURRENCE AT SAMPIT BAY, KOTA WARINGIN TIMUR DISTRICT, CENTRAL KALIMANTAN PROVINCE." BULLETIN OF THE MARINE GEOLOGY 28, no. 1 (February 15, 2016): 1. http://dx.doi.org/10.32693/bomg.28.1.2013.50.

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The study area is fluviatile deposit which consists of yellow to light gray loose sand, iron oxide, and kaoline spreading from the land shallowing to sea direction. Concentration grade for determining of gold and silver content used a total analysis of the hot mixture HF-HNO3-HClO4 with measurements "Atomic Absorption Spectrofotometry".(AAS). Highest concentration of gold and silver found at sample GCTS-31 that gold 0.096 ppm and silver 2.284 ppm, in muddy sand type sediment, at 3.1 meters depth and arround 1,250 meter length from coast line. While the lowest concentration of the gold was 0.025 ppm found at sample GBTS 14 in very fine sand type sediment located at 1.07 meter depth and approximately 320 meters length from coast line. The lowest concentration of the silver was founded at sample GBTS 25 that is 0.860 ppm in sandy mud sediment type located at 2.49 meters depth and approximately 3,000 meters length from the coast line. The gold placer is may derived from weathering of Pambuang Formation which spreads in the west and north of Sampit Bay, and transported by Mentaya River and longshore current system. Key word : sediment samples, laboratory analyses, gold, silver and Sampit Bay. Daerah penelitian merupakan endapan fluviatil terdiri dari pasir lepas berwarna kuning muda sampai abu-abu pucat, oksida besi, dan kaolin yang memiliki sebaran makin mendangkal ke arah laut. Kadar konsentrasi untuk menentukan kandungan emas dan perak menggunakan analisis total campuran HF-HNO3-HClO4 dengan metoda AAS. Analisa besar butir digunakan untuk memisahkan sedimen fraksi kasar sedangkan analisa pipet dilakukan terhadap sediment fraksi halus. Kadar emas dan perak tertinggi terdapat pada contoh GCTS -31, yaitu emas 0,096 ppm dan perak 2,284 ppm, pada jenis sedimen lumpur pasiran, di kedalaman 3,1 meter dan sekitar 1.250 meter dari garis pantai. Sedangkan kadar emas terendah yaitu 0,025 ppm terdapat pada contoh GBTS 14 pada jenis sedimen pasir sangat halus di kedalaman 1,07 meter dan sekitar 320 meter dari garis pantai. Kadar perak terendah dijumpai pada contoh GBTS 25 yaitu 0,860 ppm dengan jenis sedimen pasir lumpuran pada kedalaman 2,49 meter dan sekitar 3.000 meter dari garis pantai. Sumber emas plaser diperkirakan dari lapukan Formasi Pembuang yang memiliki sebaran cukup luas di sebelah barat dan utara Teluk Sampit dan ditransportasi oleh Sungai Mentaya dengan anak-anak sungainya, serta sistem arus memanjang pantai. Kata kunci : contoh sedimen, analisis laboratorium, emas, perak dan Perairan Teluk Sampit.
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13

Bierlein, F. P., D. C. Arne, S. M. Keay, and N. J. McNaughton. "Timing relationships between felsic magmatism and mineralisation in the central Victorian gold province, southeast Australia." Australian Journal of Earth Sciences 48, no. 6 (December 2001): 883–99. http://dx.doi.org/10.1046/j.1440-0952.2001.00907.x.

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14

Wade, C. E., J. L. Payne, K. Barovich, S. Gilbert, B. P. Wade, J. L. Crowley, A. Reid, and E. A. Jagodzinski. "ZIRCON TRACE ELEMENT GEOCHEMISTRY AS AN INDICATOR OF MAGMA FERTILITY IN IRON OXIDE COPPER-GOLD PROVINCES." Economic Geology 117, no. 3 (May 1, 2022): 703–18. http://dx.doi.org/10.5382/econgeo.4886.

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Abstract Extrusive and intrusive felsic magmas occur throughout the evolution of silicic-dominated large igneous province magmatism that is temporally related to numerous economically significant iron oxide copper-gold (IOCG) deposits in southern Australia. We investigate zircon trace element signatures of the felsic magmas to assess whether zircon composition can be related to fertility of the volcanic and intrusive suites within IOCG-hosted mineral provinces. Consistent with zircon forming in oxidizing magmatic conditions, the rare earth element (REE) patterns of zircon sourced from both extrusive and intrusive magmatic rocks are characterized by light REE depletions and a range of positive Ce and negative Eu anomalies. The timing of the major phase of IOCG mineralization overlaps with the early part of the first phase of Lower Gawler Range Volcanics magmatism (1593.6–1590.4 Ma) and older intrusive magmatism of the Hiltaba Suite (1593.06–1590.50 Ma). Zircon in these mineralization-related intrusives and extrusives is distinguished from zircon in younger, mineralization-absent rocks by higher Eu/Eu*, Ce/Ce*, and Ti values and separate magma evolution paths with respect to Hf. These zircon characteristics correspond to lower degrees of fractionation and/or crustal assimilation, more oxidizing magmatic conditions, and higher magmatic temperatures, respectively, in magmas coeval with mineralization. In this respect, we consider higher oxidation state, lower degrees of fractionation, and higher magmatic temperatures to be features of fertile magmas in southern Australian IOCG terrains. Similar zircon REE characteristics are shared between magmas associated with southern Australian IOCG and iron oxide-apatite (IOA) rhyolites from the St. Francois Mountains, Missouri, namely high Ce/Ce* and high Dy/Yb, indicative of oxidized and dry magmas, respectively. The dry and more fractionated nature of the IOCG- and IOA-associated magmas contrasts with the hydrous and unfractionated nature of fertile porphyry Cu deposit magmas. As indicated by high Ce/Ce* ratios, the oxidized nature is considered a key element in magma fertility in IOCG-IOA terrains. In both IOCG and IOA terrains, the trace element compositions of zircon are able to broadly differentiate fertile from nonfertile magmatic rocks.
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15

CARPENTER, R. L., and N. A. DUKE. "Geological Setting of the West Meliadine Gold Deposits, Western Churchill Province, Nunavut, Canada." Exploration and Mining Geology 13, no. 1-4 (January 1, 2004): 49–65. http://dx.doi.org/10.2113/gsemg.13.1-4.49.

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Abstract The West Meliadine area is underlain by structurally interleaved panels of mafic and minor ultramafic metavolcanic rocks and metasedimentary rocks that occur along the northern margin of the Neoarchean Rankin Inlet greenstone belt. Three structural and metamorphic domains are recognized: (1) the easterly Wesmeg domain; (2) the central Barracuda-Ridge domain; and (3) the westerly Peter Lake domain. The Wesmeg domain is characterized by a series of southeast-trending, north-dipping, foliation-parallel panels of greenschist facies mafic metavolcanic and metasedimentary rocks. The Barracuda-Ridge domain is comprised of greenschist to amphibolite facies mafic metavolcanic rocks that define an east-northeast-trending structural grain. The Peter Lake domain consists of amphibolite facies mafic metavolcanic rocks and minor metasedimentary rocks intruded by a monzonite pluton. West Meliadine hosts the economically significant Wesmeg gold deposits, as well as other important gold showings across the Barracuda-Ridge and Peter Lake domains. The geological setting of the Wesmeg gold deposits resembles that of a break or fault zone. The Pyke Break is a major geophysical discontinuity (>65-km strike length) and is the first-order structural control on gold mineralization at West Meliadine. It is several kilometers wide and characterized by polyphase deformation and shear zone development accompanied by lode-gold mineralization. In general, gold concentration is related to quartz and iron-carbonate veining, iron sulfides (mainly arsenopyrite and pyrrhotite), and accompanying silicate alteration minerals that overprint favorable chemical and structural traps late in the history of deformation.
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16

Li, Yongquan, Dehui Zhang, Nan Yang, Tao Zhang, and Wenquan Shi. "Primary geochemical haloes study of the possibly Carlin-like Dashui gold deposit for gold exploration in southern Gansu Province, central China." Geochemistry: Exploration, Environment, Analysis 19, no. 1 (June 12, 2018): 6–23. http://dx.doi.org/10.1144/geochem2017-064.

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17

Kelka, Ulrich, Cericia Martinez, Carmen Krapf, Stefan Westerlund, Ignacio Gonzalez-Alvarez, Mark Pawley, and Clive Foss. "Establishing an integrated workflow identifying and linking surface and subsurface lineaments for mineral exploration under cover: example from the Gawler Craton, South Australia." Solid Earth 13, no. 4 (April 29, 2022): 827–47. http://dx.doi.org/10.5194/se-13-827-2022.

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Abstract. Mineral exploration in areas comprising thick and complex cover represents an intrinsic challenge. Cost- and time-efficient methods that help to narrow down exploration areas are therefore of particular interest to the Australian mining industry and for mineral exploration worldwide. Based on a case study around the Tarcoola gold mine in the regolith-dominated South Australian central Gawler Craton, we suggest an exploration targeting workflow based on the joint analysis of surface and subsurface lineaments. The datasets utilised in this study are a digital elevation model and radiometric data that represent surface signals and total magnetic intensity and gravity attributed to subsurface signals. We compare automatically and manually mapped lineament sets derived from remotely sensed data. In order to establish an integrated concept for exploration through cover based on the best-suited lineament data, we will point out the most striking differences between the automatically and manually detected lineaments and compare the datasets that represent surficial in contrast to subsurface structures. We further show how lineaments derived from surface and subsurface datasets can be combined to obtain targeting maps that help to narrow down areas for mineral exploration. We propose that target areas are represented by high lineament densities which are adjacent to regions comprising high density of lineament intersections.
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18

FERNANDES, CARLOS JOSÉ, GÊNOVA MARIA PULZ, RAUL MINAS KUYUMJIAN, and FRANCISCO EGÍDIO CAVALCANTE PINHO. "Diferenças Entre os Depósitos Auríferos do Grupo Aguapei (Estado de Mato Grosso) e os Clássicos Exemplos de Ouro em Conglomerados." Pesquisas em Geociências 32, no. 1 (June 30, 2005): 17. http://dx.doi.org/10.22456/1807-9806.19534.

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Gold prospects in the Aguapeí Folded Belt are situated in the southwestern portion of the Amazon Craton, within the Alto Guaporé Province, southwestern state of Mato Grosso. The mineralizations are mainly concentrated in the Pau-a-Pique Deposit (south), Lavrinha Region (central), and São Vicente Mine (north). Gold ore comprises quartz veins and disseminations in the low-grade metamorphic metassedimentary rocks from the Aguapeí Group. This stratigraphic unit was strongly deformed by the Sunsás-Aguapeí Orogeny (1.28-0.95 Ga). The Aguapeí gold deposits differ in their petrography, chemistry, structural aspects and age from world classic gold deposits associated with coarse clastic sedimentary sequences (Witwatersrand, Jacobina, Tarkwa, etc.). This study discusses the main differences between Aguapeí gold deposits and the classic worldwide deposits hosted by conglomerates.
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19

Bahdar, Bahdar. "KINERJA BADAN AMIL ZAKAT PROVINSI SULAWESI TENGAH (Mengumpul dan Mendistribusikan Zakat)." ISTIQRA 5, no. 2 (February 13, 2018): 299–327. http://dx.doi.org/10.24239/ist.v5i2.263.

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This research was conducted at Badan Amil Zakat National Central Sulawesi Province (BAZNAS) to know the collection of zakat and infak fund and its distribution. In this study data collection using survey sample method that only records a small part of the object of research and for each element is investigated in depth which operations. Through this research it is known that: National Amil Zakat Agency of Central Sulawesi Province collects zakat funds limited to Civil Servants and Officials in Provinsi environment. Excluding Civil Servants and Officials in Town and Regency in Parovinsi Central Sulawesi. Also excluding entrepreneurs and the general public. Zakat issued by Civil Servants and Officials is Zakah on Income, not zakat mal or zakat treasure. So that collected by the Amil Body is zakat based on the amount of salary and other income for one year. So the treasures of vehicles, gardens, houses, jewelry and others are not subject to zakat.Besarnya earnings collected 2.5 percent equivalent to 85 grams of gold. Zakat is collected through the collecting unit of zakat (UPZ) in each institution. DPD and SKPD in Central Sulawesi Province. Zakat is channeled to mustahik with the consideration of fulfilling basic necessities mustahik
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20

Muhammad Muhsin Al Hakim, Arifudin Idrus, and Wiwit Suryanto. "GEOLOGY AND ORE CHARACTERISTICS OF LOW SULFIDATION EPITHERMAL GOLD MINERALIZATION AT TAMBANG SAWAH, LEBONG, BENGKULU PROVINCE." KURVATEK 7, no. 2 (November 18, 2022): 81–92. http://dx.doi.org/10.33579/krvtk.v7i2.3185.

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Abstract –– Tambang Sawah Area, Lebong Regency, Bengkulu Province, is geologically located in the Barisan mountains and Sumatra fault zone. The prospect of Tambang Sawah area lies in the physiography of the central Sumatran mountains ranges composed by the igneous rocks of the Sunda – Banda magmatic arc. This study is aimed to understand the deposit geology and ore characteristics of the gold deposit at the study area. Quartz vein mineralization of Tambang Sawah occurred in granite rock intruded into andesitic breccia rocks, with the geological structure of mineralization control in the form of joint, breccia, dike, and fault, namely the Ketahun fault that forms extentional fracture zones which were filled by hydrothermal fluid in form of quartz veins. Hydrothermal alterations that appear at the study site are typical types of alterations found in epithermal gold deposits, namely, argillic, silicified and propylitic. Sulfide minerals markers of low sulfidation epithermal type gold deposits found, namely, pyrite, calcopyrite, covelite, sphalerite and galena with colloform vein texture, cockade-crustiform, moss, and brecciated texture. Gold is interpreted to be derived from the deposition of sulfide minerals and the deposition of quartz veins, the level of gold in rocks and veins varies greatly with an average 4,8 ppm. Based on the results of ore geochemical analysis of positively correlated gold with elements Ag, Cu, Pb and Zn. Keywords: Mineralization, low sulfidation epithermal gold, Tambang Sawah, Lebong, Bengkulu.
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21

Meng, Ling-qiang, Guang-zhou Mao, Xiao-tong Liu, Peng-rui An, Ming-ping Cao, Xiang-jun Wang, Tie-liang He, Li-guo Song, and Yi-xin Dou. "Geochemical studies of the Nanxiaoyao gold deposit in central Yishu fault zone, Shandong province, Eastern China." Solid Earth Sciences 5, no. 1 (March 2020): 69–80. http://dx.doi.org/10.1016/j.sesci.2019.12.004.

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22

Liu, Chuanpeng, Wenjie Shi, Junhao Wei, Huan Li, Aiping Feng, Jun Deng, Yonglin Yao, Jiantai Zhang, and Jun Tan. "Genesis of the Late Cretaceous Longquanzhan Gold Deposit in the Central Tan-Lu Fault Zone, Shandong Province, China: Constraints from Noble Gas and Sulfur Isotopes." Minerals 11, no. 3 (February 28, 2021): 250. http://dx.doi.org/10.3390/min11030250.

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The Longquanzhan deposit is one of the largest gold deposits in the Yi-Shu fault zone (central section of the Tan-Lu fault zone) in Shandong Province, China. It is an altered-rock type gold deposit in which ore bodies mainly occur at the contact zone between the overlying Cretaceous rocks and the underlying Neoarchean gneissic monzogranite. Shi et al. reported that this deposit formed at 96 ± 2 Ma using pyrite Rb–Sr dating method and represents a new gold mineralization event in the Shandong Province in 2014. In this paper, we present new He–Ar–S isotopic compositions to further decipher the sources of fluids responsible for the Longquanzhan gold mineralization. The results show that the δ34S values of pyrites vary between 0.9‰ and 4.4‰ with an average of 2.3‰. Inclusion-trapped fluids in ore sulfides have 3He/4He and 40Ar/36Ar ratios of 0.14–0.78 Ra and 482–1811, respectively. These isotopic data indicate that the ore fluids are derived from a magmatic source, which is dominated by crustal components with minor mantle contribution. Air-saturated water may be also involved in the hydrothermal system during the magmatic fluids ascending or at the shallow deposit site. We suggest that the crust-mantle mixing signature of the Longquanzhan gold deposit is genetically related to the Late Cretaceous lithospheric thinning along the Tan-Lu fault zone, which triggers constantly uplifting of the asthenosphere surface and persistent ascending of the isotherm plane to form the gold mineralization-related crustal level magma sources. This genetic model can be applied, to some extent, to explain the ore genesis of other deposits near or within the Tan-Lu fault belt.
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Li, Jingmou, Yunsheng Ren, Qun Yang, and Xinhao Sun. "Ore Genesis of the Toudaochuan Gold Deposit in Central Jilin Province, NE China: Constraints from Fluid Inclusions and C–H–O–S–Pb Isotopes." Minerals 12, no. 8 (July 29, 2022): 964. http://dx.doi.org/10.3390/min12080964.

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The Toudaochuan gold deposit is a recently discovered lode gold deposit in Central Jilin Province. Gold ore bodies are dominantly controlled by NE-trending fault. The major hydrothermal period can be further divided into the quartz–pyrite stage (stage I), quartz–gold–polymetallic sulfides stage (stage II, major gold mineralization stage), and quartz–carbonate stage (stage III). Primary fluid inclusions (FIs) identified in quartz at different hydrothermal stages include liquid-rich aqueous FIs (L-type), CO2 FIs (C-type, including CO2-bearing C1-type FIs and CO2-rich C2-type FIs), and minor vapor-rich aqueous FIs (V-type). Microthermometry studies on different fluid inclusions indicate that the original ore-forming fluids belonged to the CO2–H2O–NaCl system characterized by a moderate–low temperature and low salinity in stages I and II, and they finally evolved into a H2O–NaCl system characterized by low temperature and low salinity in stage III. Fluid immiscibility is considered to be the key ore-forming mechanism. The initial ore-forming fluid was originated from magmatic water and was mixed with meteoric water in the later stage. The S and Pb isotope data suggest that the ore metal materials were derived from the mixed source of mantle and crust. Based on all the above data, therefore, it can be proposed that the Toudaochuan gold deposit is a mesothermal magmatic–hydrothermal gold deposit.
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Stepanov, V. A. "О коренных источниках палеороссыпей Витватерсранда (Южная Африка)." Bulletin of the North-East Science Center, no. 2 (June 28, 2022): 14–25. http://dx.doi.org/10.34078/1814-0998-2022-2-14-25.

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The article discusses Witwatersrand paleoplacers as well as current high-mercury gold placers and sources of their formation in the Unya-Bom district of the Amur province. The Witwatersrand deposits contain fine gold with significant mercury content. The original sources are unknown there. In the Unya-Bom district, during the destruction of ore bodies and the transition of high-grade mercuric gold into placers, its composition is preserved, with the exception of the high-grade shell formed in placers: silver and mercury are removed from it due to electrochemical corrosion. When transported in placers up to 25 km, the high content of mercury in the central part of gold particles corresponds to ore gold. An attempt was made to typify one of the possible sources of clastogenic gold in Witwatersrand paleoplacers. It might have been gold-quartz mineralization with high- mercury gold, similar to that common in the Unya-Bom district of the Amur region.
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Polin, V. F., N. M. Zvereva, A. V. Travin, and A. V. Ponomarchuk. "THE AGE OF GOLD MINERALIZATION IN THE KETKAP-YUNA IGNEOUS PROVINCE, FORMATIONAL TYPES OF GOLD-BEARING COMPLEXES, AND TIME DIFFERENCES IN THE OCCURRENCE OF LATE MESOZOIC MAGMATISM IN DIFFERENT PARTS OF THE ALDAN SHIELD." Tikhookeanskaya Geologiya 41, no. 5 (2022): 3–19. http://dx.doi.org/10.30911/0207-4028-2022-41-5-3-19.

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The first 40Ar/39Ar isotopic age data for hydrothermal vein gold mineralization in the late Mesozoic Ketkap-Yuna igneous province of the Aldan shield confirm the correlation between this style of mineralization and the Early Cretaceous sub-alkali magmatism, which was established by geological observations. The combination of geological characteristics and U-Pb data on magmatites enabled us to indirectly determine the age of the highly productive bimetasomatic «massif-skarn» type of mineralization associated with sub-alkali magmatogenic formations of the province. The isotopic dating of magmatites and gold mineralization in the Ketkap-Yuna igneous province and other late Mesozoic igneous provinces of the Aldan shield shows consistency in the ages of ore-bearing magmatites and associated ores. The delay in time of the Late Mesozoic magmatism manifestations in the Ketkap-Yuna igneous province and the associated gold mineralization relative to the intensification of tectonomagmatic processes in the Western and Central Aldan, as well as differences in the correlations of different types of igneous formations in the provinces, are explained by the characteristics of the regional tectonic structure and, as a consequence, the specific nature of the Late Mesozoic magmatism development in different parts of the Aldan shield. Two large areas of the late Mesozoic intensification of tectonomagmatic processes are identified in the Aldan shield that differ both in the time of the onset of polyformational magmatism and the accompanying different-type mineralization, and in the dominant formational type of magmatites: West-Central Aldan, on the one hand, and East Aldan, on the other. The former is characterized by continuous magmatic activity from the Berriasian to the early Albian (≈ 30 Ma) and predominance of the leucitite–alkali-(foid)-syenite formation, and the latter by manifestations of magmatism over a timeframe half of the above period (≈ 15 Ma) and predominance of the subalkaline diorite-granodiorite-granite formation. The termination of the late Mesozoic magmatism in both areas was subsynchronous. A «set» of magmatogenic formations in them is also similar: leucite-alkaline-(foid)-syenite with alkali granites, monzonite (shonkinite)-syenite and subalkaline diorite-granodiorite-granite. The Coniacian–Santonian outbreak of alkali volcano-plutonism during the intensification of tectonomagmatic processes is characteristic of the East Aldan region, which manifested itself in the Ketkap-Yuna igneous province after a long (about 30 Ma) period of amagmatism.
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Tian, Yongfei, Huishou Ye, Jingwen Mao, Xiaoxia Wang, Wei Jian, Peng Wang, Changhui Ke, and Xingkang Zhang. "Geochronology and geochemistry of the Dianfang gold deposit, western Henan Province, central China: Implications for mineral exploration." Ore Geology Reviews 111 (August 2019): 102967. http://dx.doi.org/10.1016/j.oregeorev.2019.102967.

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Niroomand, Shojaeddin, Jamshid Hassanzadeh, Hossein Ali Tajeddin, and Sina Asadi. "Hydrothermal evolution and isotope studies of the Baghu intrusion-related gold deposit, Semnan province, north-central Iran." Ore Geology Reviews 95 (April 2018): 1028–48. http://dx.doi.org/10.1016/j.oregeorev.2018.01.015.

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Ciobanu, Cristiana L., William D. Birch, Nigel J. Cook, Allan Pring, and Pascal V. Grundler. "Petrogenetic significance of Au–Bi–Te–S associations: The example of Maldon, Central Victorian gold province, Australia." Lithos 116, no. 1-2 (April 2010): 1–17. http://dx.doi.org/10.1016/j.lithos.2009.12.004.

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Vivatpinyo, Jensarin, Punya Charusiri, and Chakkaphan Sutthirat. "Volcanic Rocks from Q-Prospect, Chatree Gold Deposit, Phichit Province, North Central Thailand: Indicators of Ancient Subduction." Arabian Journal for Science and Engineering 39, no. 1 (November 12, 2013): 325–38. http://dx.doi.org/10.1007/s13369-013-0839-z.

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Wu, Meng, Liang Li, Jing-gui Sun, and Rui Yang. "Geology, geochemistry, and geochronology of the Laozuoshan gold deposit, Heilongjiang Province, Northeast China: implications for multiple gold mineralization events and geodynamic setting." Canadian Journal of Earth Sciences 55, no. 6 (June 2018): 604–19. http://dx.doi.org/10.1139/cjes-2018-0038.

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The Laozuoshan gold deposit, located in the central part of the Jiamusi Massif, is hosted by the contact zone between granitic complex and Proterzoic strata. In this study, we present the results of geochronology and geochemistry of ore-related granodiorite and diorite porphyry, and hydrothermal sericite 40Ar/39Ar dating. The granodiorite and diorite porphyry in the Laozuoshan gold deposit are calc-alkaline and high-K (calc-alkaline) series, which are enriched in LREE and LILE and depleted in HFSE, with no depletion of Eu. The geochronology data show that zircon U–Pb ages of the granodiorite and diorite porphyry are ∼262 Ma and ∼105 Ma, respectively. The sericite 40Ar/39Ar ages are ∼194 Ma and ∼108 Ma. On the basis of previous researches, ore geology and geochronology studies show that the Laozuoshan gold deposit underwent at least two gold mineralization events. We suggest that the first one, which was related to skarnization, resulted from the collision between the Jiamusi and Songnen Massifs in Late Permian. The subsequent gold mineralization resulted from the subduction of the paleo-Pacific Plate in Early Cretaceous.
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Pradhan, Biswajeet, Ratiranjan Jena, Debojit Talukdar, Manoranjan Mohanty, Bijay Kumar Sahu, Ashish Kumar Raul, and Khairul Nizam Abdul Maulud. "A New Method to Evaluate Gold Mineralisation-Potential Mapping Using Deep Learning and an Explainable Artificial Intelligence (XAI) Model." Remote Sensing 14, no. 18 (September 8, 2022): 4486. http://dx.doi.org/10.3390/rs14184486.

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Geoscientists have extensively used machine learning for geological mapping and exploring the mineral prospect of a province. However, the interpretation of results becomes challenging due to the complexity of machine learning models. This study uses a convolutional neural network (CNN) and Shapley additive explanation (SHAP) to estimate potential locations for gold mineralisation in Rengali Province, a tectonised mosaic of volcano-sedimentary sequences juxtaposed at the interface of the Archaean cratonic segment in the north and the Proterozoic granulite provinces of the Eastern Ghats Belt in Eastern India. The objective is to integrate multi-thematic data involving geological, geophysical, mineralogical and geochemical surveys on a 1:50 K scale with the aim of prognosticating gold mineralisation. The available data utilised during the integration include aero-geophysical (aeromagnetic and aerospectrometric), geochemical (national geochemical mapping), ground geophysical (gravity), satellite gravity, remote sensing (multispectral) and National Geomorphology and Lineament Project structural lineament maps obtained from the Geological Survey of India Database. The CNN model has an overall accuracy of 90%. The SHAP values demonstrate that the major contributing factors are, in sequential order, antimony, clay, lead, arsenic content and a magnetic anomaly in CNN modelling. Geochemical pathfinders, including geophysical factors, have high importance, followed by the shear zones in mineralisation mapping. According to the results, the central parts of the study area, including the river valley, have higher gold prospects than the surrounding areas. Gold mineralisation is possibly associated with intermediate metavolcanics along the shear zone, which is later intruded by quartz veins in the northern part of the Rengali Province. This work intends to model known occurrences with respect to multiple themes so that the results can be replicated in surrounding areas.
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Zhao, W. y., X. w. Liu, Q. y. Wang, and Q. j. Zhang. "Space symmetry of prehnite，Ca2AI[6](Si3AIO10)(OH)2, from the Tieshan iron mineral deposit, Central China." Mineralogical Magazine 67, no. 1 (February 2003): 73–77. http://dx.doi.org/10.1180/0026461036710085.

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AbstractThe space symmetry of prehnite, a mineral which occurs in cavities and veins within skarn from the Tieshan iron mineral deposit, Daye, Hubei province, central China, has been determined using selected area electron diffraction (SAED) and convergent-beam electron diffraction (CBED) on the submicrometer scale. Our results confirm that natural prehnite may belong to space group Pncm. The unit-cell parameters of the prehnite investigated ( a = 0.458 nm, b = 0.555 nm and c = 1.853 nm) have been calculated using the multicrystal diffraction rings of gold, the internal standard.
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Ramadhani, Sriyati, Ahamd Rifa’i, Kabul Basah Suryolelono, and Wahyu Wilopo. "Slope Stability of Metamorphic Rocks Based on Rock Mass Classification at Poboya Gold Mine, Central of Sulawesi Province." International Review of Civil Engineering (IRECE) 9, no. 3 (May 31, 2018): 91. http://dx.doi.org/10.15866/irece.v9i3.13889.

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Ramadhani, Sriyati, Ahmad Rifa’i, Kabul Basah Suryolelono, and Wahyu Wilopo. "Slope Stability of Metamorphic Rocks Based on Rock Mass Classification at Poboya Gold Mine, Central of Sulawesi Province." International Review of Civil Engineering (IRECE) 10, no. 1 (January 31, 2019): 55. http://dx.doi.org/10.15866/irece.v10i1.17373.

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35

Taylor, D. H., R. A. Cayley, A. H. M. VandenBerg, V. J. Morand, F. P. Bierlein, D. C. Arne, S. M. Keay, and N. J. Mc Naughton. "Discussion and Reply Timing relationships between felsic magmatism and mineralisation in the central Victorian gold province, southeast Australia." Australian Journal of Earth Sciences 49, no. 3 (June 2002): 587–91. http://dx.doi.org/10.1046/j.0812-0099.2002.00940.x.

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36

Bierlein, F. P., H. J. Northover, D. I. Groves, R. J. Goldfarb, and E. E. Marsh. "Controls on mineralisation in the Sierra Foothills gold province, central California, USA: a GIS-based reconnaissance prospectivity analysis." Australian Journal of Earth Sciences 55, no. 1 (February 2008): 61–78. http://dx.doi.org/10.1080/08120090701581398.

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Martins-Ferreira, Marco Antonio Caçador, José Eloi Guimarães Campos, and Augusto Cesar Bittencourt Pires. "Near-mine exploration via soil geochemistry multivariate analysis at the Almas gold province, Central Brazil: A study case." Journal of Geochemical Exploration 173 (February 2017): 52–63. http://dx.doi.org/10.1016/j.gexplo.2016.11.011.

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38

Lombah, Roberto Adriano, Adi Jaya, Kembarawati, Eka Noor Taufik, Emmy Uthanya Antang, and Zafrullah Damanik. "Kebijakan Pemerintah Kabupaten Gunung Mas Dalam Pengendalian Kerusakan Lingkungan Pertambangan Emas Skala Kecil." Jurnal Penelitian UPR 1, no. 2 (January 1, 2022): 40–54. http://dx.doi.org/10.52850/jptupr.v1i2.4096.

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This study is to determine the policies of the Gunung Mas Regency Government regarding Small-Scale Gold Mining in Tanjung Riu Village, to know the factors that cause small-scale gold mining activities, knowing the social impacts that occur, knowing the policies of the Gunung Mas Regency Government. This research is a qualitative descriptive study using the purposive sampling technique. The research was conducted in Tanjung Riu Village, Kurun District, Gunung Mas Regency, Central Kalimantan Province, from August to September 2019. The variables observed included (1) Economic Factors, (2) Social and Cultural Factors, (3) Government policy in implementing Community Mining Areas (WPR). The results showed that the factors causing small-scale gold mining (ASGM) in Tanjung Riu Village were economic factors with a percentage of 92.7%. The social impact resulting from Small Scale Gold Mining (ASGM) activities is the circulation of illegal drugs by 64.23%. The Gunung Mas Regency government policy regarding Small-Scale Gold Mining (PESK) is granting People's Mining Permits (IPR) and managed through the Gunung Mas Perkasa Regional Company. The community obeys government regulations by not working illegally.
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39

Idrus, Arifudin, Fahmi Hakim, I. Wayan Warmada, Mochammad Aziz, Jochen Kolb, and Franz Michael Meyer. "GEOLOGY AND ORE MINERALISATION OF NEOGENE SEDIMENTARY ROCK HOSTED LS EPITHERMAL GOLD DEPOSIT AT PANINGKABAN, BANYUMAS REGENCY, CENTRAL JAVA, INDONESIA." Journal of Applied Geology 7, no. 2 (July 27, 2015): 75. http://dx.doi.org/10.22146/jag.26981.

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Low suphidation (LS) epithermal gold deposits were recently found in the Paningkaban area, Central Java province, Indonesia, with more than five hundred artisanal gold miners currently operating in the area. This study is aimed to understand the geological factors controlling the gold mineralization and to characterize the alteration and ore mineralogy of the deposit. Several epithermal veins/veinlets trending N–S, NW–SE, and NE–SW are hosted by Tertiary turbiditic volcanoclastic sedimentary rocks of the Halang formation. This formation is composed of looping gradation of sandstone and siltstone units. Pre- and syn-mineralization structures such as extension joints, normal sinitral fault and sinitral fault control the gold mineralization. Fault movements formed dilational jogs manifested by NW-SE-trending en-echelon tension gash veins. Four main alteration zones are identified: (a) phyllic, (b) argillic, (c) sub propylitic and (d) weak subpropylitic. Ore minerals consist of native gold, electrum, native silver, pyrite, chalcopyrite, sphalerite, galena, arsenopyrite, cubanite, marcasite, covellite and tennantite, which are commonly associated withargillic alteration. Vein structures such as massive, swarm and low angle veins, stockwork and veins dispersed in diatreme breccia are present. Normal banded, cockade, crustiform, bladed carbonates as well as, comb and saccharoidal features are the typical vein textures. It is noteworthy that the veins are basically composed of carbonate with minor quartz at gold grades of up to 83 g/t Au. Based on the vein structures and textures, four stages of ore mineralization were developed consisting of (a) early stage (fluidized breccia and quartz vein), (b) middle stage (carbonate base metal), (c) late stage (late carbonate), and supergene stage. Gold mineralization originated mainly during middle and late stages, particularly in association with cockade, crustiform, bladed carbonate base metal veins. Based on those various features, the LS epithermal deposit in the study area is categorized as carbonate-base metalgold mineralization type.
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Ali, Khaled, Qiuming Cheng, Wenchang Li, and Yongqing Chen. "Multi-element association analysis of stream sediment geochemistry data for predicting gold deposits in south-central Yunnan Province, China." Geochemistry: Exploration, Environment, Analysis 6, no. 4 (October 24, 2006): 341–48. http://dx.doi.org/10.1144/1467-7873/06-109.

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Kimijima, Satomi, Masayuki Sakakibara, and Masahiko Nagai. "Characterizing Time-Series Roving Artisanal and Small-Scale Gold Mining Activities in Indonesia Using Sentinel-1 Data." International Journal of Environmental Research and Public Health 19, no. 10 (May 21, 2022): 6266. http://dx.doi.org/10.3390/ijerph19106266.

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The rapid growth of roving mining camps has negatively influenced their surrounding environment. Although artisanal and small-scale gold mining (ASGM) is a major source of gold production, the mining activities and their activeness are not well revealed owing to their informal, illegal, and unregulated characteristics. This study characterizes the transformations of roving camp-type ASGM (R-C-ASGM) activities in Central of Katingan Regency, Central Kalimantan Province, Indonesia, from 2015 to 2021 using remotely sensed data, such as the time-series Sentinel-1 dataset. The results show that the growth of active R-C-ASGM sites was identified at the center of the Galangan mining region with expansions to the northwest part along the Kalanaman River, especially in 2021. Hence, these approaches identify the transformations of roving mining activities and their active or nonactive status even in tropical regions experiencing frequent heavy traffic rainstorms. They provide significant information on the socioenvironmental risks possibly caused at local and regional levels. Our results also inform the design of timely interventions suited to local conditions for strengthening environmental governance.
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Órdenes, Javier, Norman Toro, Aldo Quelopana, and Alessandro Navarra. "Data-Driven Dynamic Simulations of Gold Extraction Which Incorporate Head Grade Distribution Statistics." Metals 12, no. 8 (August 18, 2022): 1372. http://dx.doi.org/10.3390/met12081372.

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The Alhué mining district, Chile, is an example of a high-grade Au-Ag-Zn(-Pb) deposit with mineralized veins that contain variable amounts of copper sulfides, which are detrimental to the cyanidation process. Similar deposits can be found in the central zone of Chile, with polymetallic veins (Au, Ag, Cu, Pb, and Zn) that are related to subvolcanic intrusive events, the development of collapse calderas, and extensive hydrothermal alteration, such as Bronces de Petorca, the Chancón mining district and Cerro Cantillana; areas of the world with similar formations include the western United States and the Henan Province in central China, for example. Mineralogical variation can be managed within the metallurgical process by alternating its operational modes. The decision to switch between modes is governed by current and forecasted stockpile levels feeding into the process, according to a discrete rate simulation (DRS) framework that has now been developed to incorporate head grade data for gold. Customized simulations that incorporate probability distribution models using head grade have now been developed, following a statistical analysis based on data from the Alhué district. This study applies data-driven simulation modeling to represent standardized operational modes and their impact on the operational performance of gold extraction.
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43

GEUSEBROEK, P. A., and N. A. DUKE. "An Update on the Geology of the Lupin Gold Mine, Nunavut, Canada." Exploration and Mining Geology 13, no. 1-4 (January 1, 2004): 1–13. http://dx.doi.org/10.2113/gsemg.13.1-4.1.

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Abstract The Lupin mine, located in the central Slave province just east of the western boundary of Nunavut Territory, is a world-class example of a Neoarchean-aged banded iron formation (BIF)-hosted lode-gold deposit. At the minesite the gold-mineralized Lupin BIF, separating stratigraphically underlying psammitic wacke and overlying argillaceous turbidite sequences, delineates the Lupin dome, a hammerhead-shaped F2/F3 interference fold structure occurring at the greenschist to amphibolite facies metamorphic transition within the thermal aureole of the Contwoyto batholith. Detailed paragenetic relationships indicate that peak thermal metamorphism coincided with the switch from regional D2 compression to rapid D3 unroofing of the Neoarchean orogenic infrastructure. Gold initially precipitated with pyrrhotite, replacing amphibolitic BIF at the apex of the Lupin deformation zone, separating the east and west lobes of the Contwoyto batholith. Over the course of associated prograde/retrograde metasomatic overprints, gold was further remobilized during garnet and loellingite/arsenopyrite growth in chlorite-altered selvages of late-forming ladder quartz veins. A metamorphic model of ore genesis, with gold being scavenged and transported by metamorphic fluid that was shed and structurally trapped at the amphibolite recrystallization front, is favored over the previously proposed syngenetic and exogenic models of gold concentration that have tended to polarize genetic interpretations to date.
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44

Muryani, Eni. "Sinergisitas Penegakan Hukum Pada Kasus Pertambangan Emas Tanpa Izin di Kabupaten Banyumas, Jawa Tengah." BESTUUR 7, no. 2 (December 31, 2019): 19. http://dx.doi.org/10.20961/bestuur.v7i2.40437.

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<p><em>Traditional unlicensed gold mining is found in various places in Indonesia. Mining is carried out by the people and processing gold using mercury, solely to make ends meet, they do not think the impact on environmental damage and pollution and legal aspects that can ensnare it. The purpose of this paper is to evaluate the synergy of the legal umbrella and law enforcement practices in unlicensed gold mining (PETI), especially in the case of gold mining in Banyumas Regency, Central Java Province. The research method used is juridical-normative. The research data used are primary and secondary legal materials. The results showed that gold mining carried out without permission in Banyumas District was prone to cause pollution to the environment and workplace accidents. The rise of unlicensed gold mining makes it difficult for government supervision. All existing regulations and laws in synergy regulate how the people's gold mining activities should not create problems for the environment. It's just that implementation in the field is still a lot of violations, especially licensing issues. Law enforcement against illegal gold mining is carried out with preventive and repressive measures.</em></p><p> </p><p><strong>Keywords</strong>: <em>Banyumas, Law Enforcement, Gold Mining.</em><em></em></p>
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Yatini, Y., Imam Suyanto, and Dwi Puspaningrum. "Application of Polarization Method (IP) to Delineate the Gold Mineralization Zones in Cihonje Areas, Banyumas Regency, Province of Central Java." IOP Conference Series: Materials Science and Engineering 546 (June 26, 2019): 072013. http://dx.doi.org/10.1088/1757-899x/546/7/072013.

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46

Cruz, C., F. Noronha, P. Santos, J. K. Mortensen, and A. Lima. "Supergene gold enrichment in the Castromil-Serra da Quinta gold deposit, NW Portugal." Mineralogical Magazine 82, S1 (February 28, 2018): S307—S320. http://dx.doi.org/10.1180/minmag.2017.081.063.

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ABSTRACTSeveral gold deposits hosted mainly by Variscan granites and Precambrian to Palaeozoic metasediments occur in the northwestern part of Portugal. Most of these deposits were mined by the Romans (in the period I BC to II AD) as open pits and surface galleries. The Castromil-Serra da Quinta gold deposit is an important example of such a mined site; it occurs in the Dúrico-Beirã Au province located in the Central Iberian Zone (CIZ) in the western branch of European Variscan belt, mainly on the eastern flank of the Valongo anticline. Open pits and underground galleries at Castromil-Serra da Quinta exploited the gossan formed from the weathering of primary mineralization. The gossan is composed essentially of goethite, scorodite and clay minerals. A recent drilling campaign at Castromil-Serra da Quinta has provided samples of the primary mineralization below the oxidation level. Different modes of gold occurrence are defined based on metallographic studies of both the gossan and drill cores. Gold I occurs encapsulated in primary sulfide minerals, mainly arsenopyrite and pyrite; Gold II is also associated with the main primary sulfides, but occurs along grain boundaries and in microfractures of the sulfides or in associated quartz veins; and Gold III occurs as free gold particles in iron oxides within the gossan. In the gossan samples, it is difficult to distinguish whether the gold particles hosted in oxides correspond to Gold I, Gold II, or both, so these particles are described as Gold I–II and they are commonly surrounded by very much smaller particles of Gold III. Scanning electron microscope (SEM) and electron probe microanalysis (EPMA) data for the different gold particles reveal that Gold I is poorer in Ag (~15.5–39.76%) than Gold II (37.46–51.45%), whereas Gold III corresponds to native gold (<16.11% Ag). Gold III is thought to reflect gold enrichment in the upper level of the deposit, resulting from weathering processes that affected the primary Au (Bi) mineralization.
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Zhou, Xiaohui, Shoufa Lin, and Scott D. Anderson. "Stratigraphy, structure and lode gold system at the Central Manitoba mine trend, Rice Lake greenstone belt, Archean Superior Province, Manitoba, Canada." Precambrian Research 281 (August 2016): 80–100. http://dx.doi.org/10.1016/j.precamres.2016.05.020.

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Chao, Weiwei, Ken‐ichiro Hayashi, Huishou Ye, Jingwen Mao, Yanguang Geng, Minfeng Bi, Peng Wang, and Qiuming Pei. "Geology, Mineralogy, Geochronology, and Sulfur Isotope Constraints on the Genesis of the Luanling Gold Telluride Deposit, Western Henan Province, Central China." Resource Geology 69, no. 4 (May 13, 2019): 333–50. http://dx.doi.org/10.1111/rge.12204.

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49

Tegner, Christian, Sandra A. T. Michelis, Iain McDonald, Eric L. Brown, Nasrrddine Youbi, Sara Callegaro, Sofie Lindström, and Andrea Marzoli. "Mantle Dynamics of the Central Atlantic Magmatic Province (CAMP): Constraints from Platinum Group, Gold and Lithophile Elements in Flood Basalts of Morocco." Journal of Petrology 60, no. 8 (August 1, 2019): 1621–52. http://dx.doi.org/10.1093/petrology/egz041.

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Abstract Mantle melting dynamics of the Central Atlantic Magmatic Province (CAMP) is constrained from new platinum group element (PGE), gold (Au), rare earth element (REE), and high field strength element (HFSE) data and geochemical modelling of flood basalts in Morocco. The PGE are enriched similarly to flood basalts of other large igneous provinces. The magmas did not experience sulphide saturation during fractionation and were therefore fertile. The CAMP is thus prospective for PGE and gold mineralization. The Pt/Pd ratio of the Moroccan lavas indicates that they originated by partial melting of the asthenospheric mantle, not the subcontinental lithospheric mantle. Mantle melting modelling of PGE, REE and HFSE suggests the following: (1) the mantle source for all the lavas was dominated by primitive mantle and invariably included a small proportion of recycled continental crust (&lt;8%); (2) the mantle potential temperature was moderately elevated (c. 1430°C) relative to ambient mantle; (3) intra-lava unit compositional variations are probably a combined result of variable amounts of crust in the mantle source (heterogeneous source) and fractional crystallization; (4) mantle melting initially took place at depths between c. 110 and c. 55 km and became shallower with time (c. 110 to c. 32 km depth); (5) the melting region appears to have changed from triangular to columnar with time. These results are best explained by melting of asthenospheric mantle that was mixed with continental sediments during the assembly of Pangaea, then heated and further mixed by convection while insulated under the Pangaea supercontinent, and subsequently melted in multiple continental rift systems associated with the breakup of Pangaea. Most probably the CAMP volcanism was triggered by the arrival of a mantle plume, although plume material apparently was not contributing directly (chemically) to the magmas in Morocco, nor to many other areas of CAMP.
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Barbuena, Danilo, Carlos Roberto de Souza Filho, Emilson Pereira Leite, Emílio Miguel Junior, Rafael Rodrigues de Assis, Roberto Perez Xavier, Francisco José Fonseca Ferreira, and Antônio João Paes de Barros. "AIRBORNE GEOPHYSICAL DATA ANALYSIS APPLIED TO GEOLOGICAL INTERPRETATION IN THE ALTA FLORESTA GOLD PROVINCE, MT." Revista Brasileira de Geofísica 31, no. 1 (March 1, 2013): 169. http://dx.doi.org/10.22564/rbgf.v31i1.254.

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The Alta Floresta Gold Province (AFGP) is located in the central-southern portion of the Amazon Craton. In its eastern segment there are more than one hundred gold deposits hosted in volcanic and plutonic rocks of medium to high content of potassium. In many of these deposits the gold ore is correlated spatially and genetically hydrothermal systems and mainly hosted into the silicification potassic and sericitic. In this context, this work focuses on understanding the geological context of the region and the possibility of expanding new exploratory frontiers through techniques further traditional geological mapping. The processing and interpretation of airborne magnetic and gamma-ray spectrometry data of the Juruena-Teles Pires Project (Phase 1) allowed the production of a new regional geological map of the eastern portion of the AFGP. Additionally, theoretical models showed that despite the limitations of the reduction to the pole at low latitudes, the magnetic enhancements proposed can be applied to real data through the use of directional filtering to eliminate the features generated in the magnetic declination direction. The Total Horizontal Derivative of the Tilt Derivative (THDR-TDR) method proved the best enhancement for the interpretation of the structures, showing a structural complexity similar to that proposed for the evolution of the province. The interpretation of the products based on the gamma-ray spectrometry channels allowed the reinterpretation of different geological units, including the individualization of a new high-potassium intrusive unit, which in the context of AFGP may have metallogenetic potential. RESUMO: A Província Aurífera de Alta Floresta (PAAF) situa-se na porção centro-sul do cráton Amazônico. Em seu segmento leste, ocorrem mais de uma centena de depósitos auríferos hospedados em rochas plutônicas e vulcânicas de médio a alto potássio. Além disso, em muitos desses depósitos o minério aurífero apresenta relação espacial e genética com alterações hidrotermais, preferencialmente alterações do tipo potássica e sericítica. Nesse contexto, o trabalho enfoca o entendimento do contexto geológico dessa região e a possibilidade de expansão de novas fronteiras exploratórias por meio de técnicas que vão além do mapeamento geológico tradicional. Assim, através do processamento e interpretação de dados aeromagnetométricos e aerogamaespectrométricos do projeto Juruena-Teles Pires (Fase 1) gerou-se um novo mapa geológico regional da porção leste da PAAF. Adicionalmente, por meio de modelos teóricos observou-se que apesar das limitações da redução ao polo em baixas latitudes, os realces magnéticos propostos podem ser aplicados aos dados reais mediante o uso de filtros direcionais que eliminem os artefatos gerados na direção da declinação magnética. O método Inclinação do Sinal Analítico do Gradiente Horizontal Total (ISA-GHT) mostrou-se como o realce mais adequado para a interpretação de lineamentos, revelando uma complexidade estrutural similar àquela proposta para a evolução da província. A interpretação dos produtos gerados com base nos canais gamaespectrométricos permitiu a reinterpretação de diversas unidades geológicas, inclusive a individualização de uma nova unidade intrusiva de alto potássio, que nocontexto da PAAF pode possuir potencial metalogenético.Palavras-chave: Província Aurífera de Alta Floresta; dados aerogeofísicos; interpretação geológica
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