Relevant bibliographies by topics / Drill core

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Drill core'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

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Journal articles on the topic "Drill core"

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Tsao, Chung Chen, Kei Lin Kuo, I. Chien Hsu, and G. T. Chern. "Analysis of Core-Candlestick Drill in Drilling Composite Materials." Key Engineering Materials 419-420 (October 2009): 337–40. http://dx.doi.org/10.4028/www.scientific.net/kem.419-420.337.

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Unlike ductile metals cutting mechanism, the interfaces between fiber and matrix as a transitional layer experience mismatched deformation in machining process. In general, the most frequent operation performed on composite materials is drilling with a twist drill to generate a hole owing to their versatility and low production cost. However, delamination is one of the most common defects in drilling laminated fiber-reinforced composites and can cause a significant reduction in the load-carrying capacity of a structure. At the periphery, using such special drills as saw drill, candlestick drill and core drill, reducible to causing delamination damage than the twist drill. Experimental results indicated that the diameter ratio and feed rate have statistical and physical significance on the thrust force obtained with a core-candlestick drill.
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Kojima, Yuto, Ryutaro Tanaka, Yasuo Yamane, Katsuhiko Sekiya, and Keiji Yamada. "Drilling of CFRP with an Electrodeposited Diamond Core Drill – Effects of Air Assistance and Tool Shape –." International Journal of Automation Technology 10, no. 3 (May 2, 2016): 310–17. http://dx.doi.org/10.20965/ijat.2016.p0310.

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This research was conducted to investigate the characteristics of electrodeposited diamond core drills when used to cut CFRP.An eccentric core drill was usedto improve cutting characteristics. First of all, the cutting characteristics of a normal core drill were investigated at a few different feed rates and compared with those of a diamond coated twist drill. The effect of air assistance on chip evacuation were also investigated. The cutting forces, surface roughness profile of the hole, and tool appearance were used for evaluation. At the same feed rate, more cutting force was necessary for the normal core drill than for the twist drill. When air was blown in, the cutting forces required by the core drill decreased drastically, but delamination was evident. When air was drawn out, the cutting forces of the normal core drill were almost the same as when there was no air assistance. On the other hand, when an eccentric core drill was used, the cutting force required was lower when air was drawn out than when it was blown in. Additionally, the surface quality of the hole when air was drawn out was greater than when it was blown in. When the eccentric core drill with slits was used while air was drawn out, the cutting forces, surface quality of the hole, and tool appearance were the same as when an eccentric core drill without slits was used. However, there was little core jamming. Therefore, the eccentric core drill with slits had the longest tool life.
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Popp, Trevor J., Steffen B. Hansen, Simon G. Sheldon, and Christian Panton. "Deep ice-core drilling performance and experience at NEEM, Greenland." Annals of Glaciology 55, no. 68 (2014): 53–64. http://dx.doi.org/10.3189/2014aog68a042.

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AbstractThe NEEM deep ice-core drilling in northwest Greenland was completed in summer 2010 after three seasons, which included establishing all drilling infrastructure. Normal drilling operations in the main borehole were declared terminated at 2537.36 m below the surface, when further penetration was stopped by a stone embedded in the ice in the path of the drill head. The design and implementation of the drilling operation strongly resembled the NGRIP drilling program. The NEEM drill was an extended version of the Hans Tausen (HT) drill, with specific modifications to optimize its use with the highly viscous Estisol-240/Coasol drill fluid used at NEEM. Modification to the drill and its performance in the new drilling fluid was largely satisfactory and successful. Throughout the drilling, special consideration was given to the way chips were transported and collected in a new chip chamber, including the consequences of drilling a larger borehole diameter than with previous drill operations that used the HT family of drills. The problems normally associated with warm ice drilling near the base of an ice sheet were largely absent at NEEM.
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Kojima, Yuto, Ryutaro Tanaka, Yasuo Yamane, Katsuhiko Sekiya, and Keiji Yamada. "Wet Core Drilling of CFRP with an Electrodeposited Diamond Core Drill - Effects of Cutting Conditions on Chip Evacuation and Core Jamming." Key Engineering Materials 749 (August 2017): 58–64. http://dx.doi.org/10.4028/www.scientific.net/kem.749.58.

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This study investigated the cutting characteristics of electrodeposited diamond core drill when used to drill a CFRP under wet condition. The effects of different tool shapes, grain sizes and feed rates were examined. A normal core drill, an eccentric with slits core drill (E.S.), and an eccentric with slits and chamfers core drill (E.S.C.) were used. The normal core drill had the shape of a hollow cylinder. The E.S. core drill had the inner cylinder shifted from the center of this tool and slits in the bottom of this tool. The E.S.C. core drill had chamfers on the periphery of this tool. The normal core drill caused severe workpiece core jamming even at 1st hole drilling, and its electro-deposited area was covered entirely by adhered chips. In the case of the E.S. core drill and E.S.C. core drill, the workpiece core did not jam and the thrust force was smaller than that of the normal core drill. The effect of chamfers was little. The E.S.C. core drill with #200 caused smaller surface roughness than that with #100. However, the thrust force was two times larger, and the delamination was observed at the exit point of the hole. In the lower feed rate per revolution the better surface roughness and the lower thrust force were obtained irrespective of the tool shape while the cutting speed showed little effect.
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Hong, J., P. Talalay, M. Sysoev, and X. Fan. "DEM modeling of ice cuttings transportation by electromechanical auger core drills." Annals of Glaciology 55, no. 68 (2014): 65–71. http://dx.doi.org/10.3189/2014aog68a002.

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AbstractElectromechanical auger core drills are widely used in shallow ice-coring practice on mountain glaciers and polar ice caps and sheets. Generally, these drills are lightweight, can be readily transported to remote drilling sites, are easily installed there and drill with relatively high rates of penetration and low power consumption. During the past few decades, dozens of electromechanical auger drills have been designed. However, the auger options were usually determined by experience, and the main parameters (auger angle and rotation speed) are varied in a wide range from drill to drill. In order to choose the optimal auger parameters, the discrete element method (DEM) is used to analyze the performance of cuttings transportation for different rotation speeds in the range 50–200 rpm and auger angles in the range 15–45°. To improve the efficiency of cuttings transportation, many factors have to be considered (e.g. particle sizes and their variability, ice temperature, material of the core barrel and jacket, and availability of needed driven motor-gears). For the conditions assumed in the present studies, the recommended rotation speed is 100 rpm at auger angles of 35–40°.
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Schwikowski, Margit, Theo M. Jenk, Dieter Stampfli, and Felix Stampfli. "A new thermal drilling system for high-altitude or temperate glaciers." Annals of Glaciology 55, no. 68 (2014): 131–36. http://dx.doi.org/10.3189/2014aog68a024.

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AbstractFor ice-core drilling on high-elevation glaciers, lightweight and modular electromechanical (EM) drills are used to allow for transportation by porters or pack animals. However, application of EM drills is constrained to glaciers with temperatures well below the ice melting point. When drilling into temperate ice, liquid water accumulates in the borehole, hindering chip transport, filling the chip barrel and finally blocking the drill. Drilling into near-temperate ice is also problematic as pressure-induced melting can cause refreezing of meltwater on the drill which then easily gets stuck in the borehole. We developed a thermal drill compatible with the Fast Electromechanical Lightweight Ice Coring System (FELICS). The melting element consists of a coil heater, molded in an aluminum crown. Using the combined mechanical and thermal drill we obtained a 101 m surface-to-bedrock ice core from temperate Silvrettagletscher, Swiss Alps. The borehole with temperatures around 0°C was filled with meltwater. Power was supplied by two 2kW gasoline generators consuming a total of 70 L of alkylate fuel. Ice-core production rate was 1.8 mh−1. The drill produced non-fractured ice cores of excellent quality with a length of 70 cm and a diameter of 75–80 mm.
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Liu, Qiong, Guoqin Huang, and Yongchao Xu. "Investigation of drilling 2D C<sub>f</sub>∕C–SiC composites with brazed diamond core drills." Mechanical Sciences 11, no. 2 (October 12, 2020): 349–56. http://dx.doi.org/10.5194/ms-11-349-2020.

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Abstract. Drilling carbon fiber reinforced silicon carbide composites still forms a big challenge for machining because of their special braided structure and anisotropy. In this study, through the drilling of 2D Cf∕C–SiC composites, two kinds of brazed diamond core drills with different abrasive distributions were compared. The results showed that the drilling force and torque of the two drills decreased with the increase in the spindle speed and increased with the increase in the feed speed. Under the same drilling conditions, the drilling force and torque of the brazed diamond drill with the ordered abrasive distribution were far lower than those of the brazed diamond drill with the random abrasive distribution. Also, the quality of the holes drilled by the drill with the ordered abrasive distribution was better than that of the holes drilled by the drill with the random abrasive distribution, which is attributed to the uniform abrasive spacing provided by the drill with the ordered abrasive distribution.
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Lopez-Diaz, Fernando, and Fernando Bastida. "Structural data from drill core." Geological Magazine 131, no. 5 (September 1994): 619–23. http://dx.doi.org/10.1017/s0016756800012401.

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AbstractA graphical method for the analysis of the orientation of planar and linear structural elements in drill core is presented. Simple computation and projection operations applied to data taken from elements traced on the cylindrical surface of the core are required. To know a structural element(s) of reference, the method requires detailed structural analysis of the surface geology around the drill hole.
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Vasil’yev, N. I., B. B. Kudryashov, P. G. Talalay, and V. K. Chistyakov. "Core drilling by electromechanical drill." Polar Record 29, no. 170 (July 1993): 235–37. http://dx.doi.org/10.1017/s0032247400018556.

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Lackie, M. A., and P. W. Schmidt. "Drill Core Orientation using Palaeomagnetism." Exploration Geophysics 24, no. 3-4 (September 1993): 609–13. http://dx.doi.org/10.1071/eg993609.

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Dissertations / Theses on the topic "Drill core"

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Heiskari, H. (Hannu). "Development of comminution test method for small drill core sample." Master's thesis, University of Oulu, 2017. http://urn.fi/URN:NBN:fi:oulu-201710112973.

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Grinding circuits are an essential part of a mineral processing plant. Grinding is very energy intensive, and can have major effects on the following separation stages of mineral processing. This sets high requirements for the design and operation of grinding circuits. Early on in the resource evaluation, ore samples used in metallurgical testing tend to be composited samples from drill cores. These composited samples can have broad mineralogical variations in them. Geometallurgy aims to create a predictive model to improve plant operation and design, based on the inherent variability of ore blocks in an ore deposit. Thus to apply geometallurgy, mineralogical information and data about the variability in ore blocks is essential. This creates a need for variability testing, where test methods are fast, inexpensive and require low volumes of sample. In this thesis the common Bond ball mill grindability test is conducted on three different sample materials. The samples show good variability in terms of mineralogy and grindability. Along with the Bond test, the Mergan ball mill grindability test is also conducted on the same sample materials. The Mergan test is faster than the Bond test, and uses less sample material than the Bond test. The aim of the testwork is to analyze the differences between the two test methods, and see if there is a correlation between them. This correlation can then be used to create a new grindability test method, where the test is done with the Outotec Mergan mill, but the test results can be scaled to estimate Bond work index for the sample. Results show that there is indeed a correlation between the two grindability test methods. Using a linear model, an experimental model is presented, where the Mergan mill can be used to approximate the Bond work index for an ore with good correlation. To validate and improve the experimental model presented, more testing should be conducted in the future
Jauhatuspiirit ovat tärkeä osa rikastamoa. Jauhatus vaatii erittäin paljon energiaa, ja sillä voi olla merkittäviä vaikutuksia rikastuksen seuraaviin osaprosesseihin. Tämä asettaa korkeat vaatimukset jauhatuspiirien suunnittelulle ja käytölle. Malmiesiintymän tutkimuksen varhaisissa vaiheissa metallurgiseen tutkimukseen saatavat näytteet ovat yleensä komposiittinäytteitä kairasydämistä, joissa voi olla suuria mineralogisia eroja. Geometallurgian tarkoituksena on luoda ennustava malli, joka perustuu malmiesiintymässä olevien eri malmioiden eroavaisuuksiin. Tätä mallia voidaan käyttää kaivoksien suunnittelun ja toiminnan optimoimiseen. Geometallurgian hyödyntämiseen tieto malmioiden eroavaisuuksista ja mineralogiasta on siis välttämätöntä. Tämä on saanut aikaan tarpeen testimenetelmille, joilla tätä vaihtelevuutta voidaan testata, ja näiden testimenetelmien tulee olla nopeita, halpoja, ja testien käyttämien näytemäärien täytyy olla pieniä. Tämän työn kokeellisessa osuudessa yleistä Bondin kuulamyllyjauhautuvuustestiä käytetään kolmen eri malminäytteen jauhautuvuuden testaamiseen. Työssä käytettävät malminäytteet eroavat toisistaan paljon niin mineralogian kuin jauhautuvuudenkin puolesta. Samojen näytteiden jauhautuvuutta testataan myös Mergan kuulamyllyjauhautuvuustestillä. Mergan menetelmän etuja ovat Bondin testiin verrattuna se että Mergan on nopeampi tehdä, ja sen näytevaatimus on Bondin testiä pienempi. Koetoiminnan tarkoituksena on verrata näiden kahden jauhautuvuustestien tuloksia ja eroavaisuuksia, ja analysoida löytyykö näiden testimenetelmien väliltä korrelaatiota. Tätä korrelaatiota voidaan sitten käyttää uuden jauhautuvuustestin kehittämiseen, jossa näytteen jauhautuvuuden testaamiseen käytetään Outotecin Merganmyllyä, ja saatu tulos skaalataan Bondin ”työindeksiin”. Koetulosteen perusteella jauhautuvuustestien väliltä löytyi korrelaatio. Tätä korrelaatiota käytetään kokeellisen lineaarisen mallin luomiseen, jossa malmin jauhautuvuutta voidaan testata Merganmyllyllä ja arvioida siitä Bondin ”työindeksi” hyvällä korrelaatiolla. Kokeellisen mallin toimivuuden vahvistamiseen ja parantamiseen tarvitaan kuitenkin vielä lisää testejä tulevaisuudessa
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Pillière, Henry, Thomas Lefevre, Dominique Harang, Beate Orberger, Thanh Bui, Cédric Duée, Nicolas Maubec, et al. "3D Imaging on heterogeneous surfaces on laterite drill core materials." TU Bergakademie Freiberg, 2017. https://tubaf.qucosa.de/id/qucosa%3A23183.

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The SOLSA project aims to construct an analytical expert system for on-line-on-mine-real-time mineralogical and geochemical analyses on sonic drilled cores. A profilometer is indispensable to obtain reliable and quantitative data from RGB and hyperspectral cameras, and to get 3D definition of close-to-surface objects such as rheology (grain shape, grain size, fractures and vein systems), material hardness and porosities. Optical properties of minerals can be analyzed by focusing on the reflectance. Preliminary analyses were performed with the commercial scan control profilometer MI-CRO-EPSILON equipped with a blue 405 nm laser on a conveyor belt (depth resolution: 10 μm; surface resolution: 30x30 μm2 (maximum resolution; 1m drill core/4 min). Drill core parts and rocks with 4 different surface roughness states: (1) sonic drilled, (2) diamond saw-cut, polished at (3) 6 mm and (4) 0.25 μm were measured (see also abstract Duée et al. this volume). The ΜICRO- EPSILON scanning does not detect such small differences of surface roughness states. Profilometer data can also be used to access rough mineralogical identification of some mineral groups like Fe-Mg silicates, quartz and feldspars). Drill core parts from a siliceous mineralized breccia and laterite with high and deep porosity and fractures were analyzed. The determination of holes’ convexity and fractures) is limited by the surface/depth ratio. Depending on end-user’s needs, parameters such as fracture densities and mineral content should be combined, and depth and surface resolutions should be optimized, to speed up “on-line-on-mine-real- time” mineral and chemical analyses in order to reach the target of about 80 m/day of drilled core.
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Pillière, Henry, Thomas Lefevre, Dominique Harang, Beate Orberger, Thanh Bui, Cédric Duée, Nicolas Maubec, et al. "3D Imaging on heterogeneous surfaces on laterite drill core materials." Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2018. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-231235.

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The SOLSA project aims to construct an analytical expert system for on-line-on-mine-real-time mineralogical and geochemical analyses on sonic drilled cores. A profilometer is indispensable to obtain reliable and quantitative data from RGB and hyperspectral cameras, and to get 3D definition of close-to-surface objects such as rheology (grain shape, grain size, fractures and vein systems), material hardness and porosities. Optical properties of minerals can be analyzed by focusing on the reflectance. Preliminary analyses were performed with the commercial scan control profilometer MI-CRO-EPSILON equipped with a blue 405 nm laser on a conveyor belt (depth resolution: 10 μm; surface resolution: 30x30 μm2 (maximum resolution; 1m drill core/4 min). Drill core parts and rocks with 4 different surface roughness states: (1) sonic drilled, (2) diamond saw-cut, polished at (3) 6 mm and (4) 0.25 μm were measured (see also abstract Duée et al. this volume). The ΜICRO- EPSILON scanning does not detect such small differences of surface roughness states. Profilometer data can also be used to access rough mineralogical identification of some mineral groups like Fe-Mg silicates, quartz and feldspars). Drill core parts from a siliceous mineralized breccia and laterite with high and deep porosity and fractures were analyzed. The determination of holes’ convexity and fractures) is limited by the surface/depth ratio. Depending on end-user’s needs, parameters such as fracture densities and mineral content should be combined, and depth and surface resolutions should be optimized, to speed up “on-line-on-mine-real- time” mineral and chemical analyses in order to reach the target of about 80 m/day of drilled core.
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Hardy, Andrew John 1965. "Fragment size distribution of in situ rock masses from drill core." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/278324.

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The success of rock fragmentation by blasting and subsurface fluid flow depends on many variables, including in-situ fragmentation. This study presents select data from a review of over 13000 feet of core samples drilled at seven different mine properties in the United States and Chile. Two-dimensional computer simulations of fractures can be used to quantify the volume of rock required to calculate a stable estimate of mean fragment size. Spatial periodicity of fragment size measurements is indicated through vertical variograms and is used as the basis for a statistical analysis for the zoning of rock masses. A more reliable quantitative method to characterize the size distribution of in-situ rock using digital image processing of drill core photographs is also included. Furthermore, a complete experimental analysis is provided for the comparison of currently used correction methods used to develop the full volumetric fragment size distribution curve.
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Gao, Shanshan, and 高珊珊. "Coring process monitoring for strength of grout, concrete and rock in laboratory testing." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B45530361.

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Guttenkunst, Emy. "Study of the wear mechanisms for drill bits used in core drilling." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355399.

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The thesis work was made in cooperation with the I-EDDA project who evaluates the drill equipment used in core drilling. The aim of this work was to determine how and why the drill bits are worn. The work consisted of two parts; investigate drill bits used in field tests and develop a lab scale method to be able to change one drill parameter at a time and see how it affects the wear. During the field tests the rotational speed and the pressure on the drill bits were changed between the three boreholes drilled. In the lab test one parameter at a time was changed; the rotational speed, the water flow and the load. The lab test was developed to attempt to replicate the core drilling and was performed by pressing a piece of a drill bit against a rotating stone cylinder. The drill bits from the field tests and lab test were analysed with the same methods on both macro- and microscale for easier comparison. The results indicate that the lab scale test can be used to evaluate the wear of drill bits. The analyses show rock present on the matrix of all the drill bits, in various amounts. The load has the largest impact on the wear of the drill bits and cause a change in mechanism. A high pressure leads to a higher amount of damaged diamonds and three body abrasive wear on the matrix. Lower pressure leads to polished diamonds and erosive wear on the matrix.
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Larsson, Corominas Miquel Sven. "Unsupervised Feature Extraction from CT Images for Clustering of Geological Drill Core Samples." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265543.

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Computed tomography (CT) scanned drill cores provide a high resolution view of the internal structure and composition of the rock, which is interesting for many analysis purposes. Although, this data is very high dimensional and difficult to analyze in an automatic way. In this work, a study of how to reduce the dimensionality of these samples is done, with the objective of being able to find low dimensional representations, which then can be clustered into distinct geologically meaningful groups. Due to the complex nature of the data, a high degree of preprocessing is required - involving thresholding, normalization, cropping, etc. First, in order to obtain a baseline for the clusters, a clustering of the chemical compositions of the samples is done, which results in overly simplistic clusters - separating ore from the rest, due to the continuous nature of the data. For the CT data, two approaches are tested - IPCA and convolutional autoencoders, which are able to successfully reduce the dimensions of the scanned samples. For the latter, different bottleneck dimensions are tested in order to evaluate its effect in the resulting reconstruction errors. Nevertheless, when attempting to cluster the low dimensional embeddings, the algorithms only manage to separate the ore from the rest of the samples, as in the chemical clustering, which is too simplistic. An alternative approach is tested in order to obtain an insight of the holes - using UMAP 3D projections as RGB color coordinates, which provide colored maps of the holes that make more geological sense and provide more information than the previous approach. To finalize, an experiment is performed by creating eight distinct classes of synthetic volumetric data with different textures and grain sizes, which resemble rock material, in order to validate the approach of clustering the convolutional autoencoder latent representations. For a sufficient number of channels, all synthetic classes are able to be clearly separated. Interestingly, latent representations of classes with bad reconstructions are still able to be clustered satisfactorily.
Datortomografi (DT) av borrkärnor ger en högupplöst bild av den interna strukturen och sammansättningen av berget, vilket är intressant ur flera analyssynpunkter. Den här typen av data är dock av mycket hög dimensionalitet, och är därför svår att analysera automatiskt. I detta arbete görs en studie av hur dimensionaliteten kan reduceras, med syfte att hitta representationer av låg dimensionalitet, vilka sedan kan samlas i geologiskt meningsfulla, distinkta grupper. På grund av datats komplexa natur behövs en hög grad av förbearbetning så som tröskelvärden, normalisering, klippning, etc. I utgångspunkten, för att erhålla en baslinje för klustern, gjordes en gruppering av den kemiska kompositionen av proverna, vilket resulterade i alltför simplistiska klusters med endast en separation av malmen från resten av bergartsprovet, på grund av den kontinuerliga karakteristiken av datat. För DT datat prövades olika angreppssätt - IPCA och faltningsankodare, vilka successivt kan reducera dimensionen hos datat. För det senare fallet provas olika flaskhalsdimensioner för att utvärdera deras effekt på de resulterande rekonstruktionsfelen. Vid försök att gruppera den lågdimensionella representationen däremot, så visar sig bergets egen kontinuerliga natur vara ett hinder, eftersom algoritmen bara lyckas skilja malm från resten, vilket är alltför förenklat. Ett alternativt angreppssätt provas för att få en insikt om borrhålen - genom UMAP 3D-projektioner som RGB-färgkoordinater, vilket resulterade i en geologiskt relevant färgkartläggning av borrhålet och gav en bättre information än den tidigare metoden. Avslutninsvis utfördes ett experiment genom att skapa åtta distinkta klasser av syntetiska volumetriska data med olika texturer och kornstorlek, liknande berggrundsmaterial, för att utvärdera riktigheten hos grupperingen från den faltande autoankodarens latenta representation. Med tillräckligt antal kanaler är alla syntetiska klasser tydligt separerbara. Intressant nog: latent representation av klasser med dålig rekonstruktion är fortfarande möjliga att gruppera tillfredsställande.
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Tiu, Glacialle. "Classification of Drill Core Textures for Process Simulation in Geometallurgy : Aitik Mine, Sweden." Thesis, Luleå tekniska universitet, Mineralteknik och metallurgi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65207.

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This thesis study employs textural classification techniques applied to four different data groups: (1) visible light photography, (2) high-resolution drill core line scan imaging (3) scanning electron microscopy backscattered electron (SEM-BSE) images, and (4) 3D data from X-ray microtomography (μXCT). Eleven textural classes from Aitik ores were identified and characterized. The distinguishing characteristics of each class were determined such as modal mineralogy, sulphide occurrence and Bond work indices (BWI). The textural classes served as a basis for machine learning classification using Random Forest classifier and different feature extraction schemes. Trainable Weka Segmentation was utilized to produce mineral maps for the different image datasets. Quantified textural information for each mineral phase such as modal mineralogy, mineral association index and grain size was extracted from each mineral map.  Efficient line local binary patterns provide the best discriminating features for textural classification of mineral texture images in terms of classification accuracy. Gray Level Co-occurrence Matrix (GLCM) statistics from discrete approximation of Meyer wavelets decomposition with basic image statistical features[PK1]  (e.g. mean, standard deviation, entropy and histogram derived values) give the best classification result in terms of accuracy and feature extraction time. Differences in the extracted modal mineralogy were observed between the drill core photographs and SEM images which can be attributed to different sample size[PK2] . Comparison of SEM images and 2D μXCT image slice shows minimal difference giving confidence to the segmentation process. However, chalcopyrite is highly underestimated in 2D μXCT image slice, with the volume percentage amounting to only half of the calculated value for the whole 3D sample. This is accounted as stereological error. Textural classification and mineral map production from basic drill core photographs has a huge potential to be used as an inexpensive ore characterization tool. However, it should be noted that this technique requires experienced operators to generate an accurate training data especially for mineral identification and thus, detailed mineralogical studies beforehand is required.
Primary Resource Efficiency by Enhanced Prediction (PREP)
Center for Advanced Mining and Metallurgy (CAMM)
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Hull, Angela Lynn. "Geochronology and thermochronology of Precambrian basement drill core samples in Nebraska and southeastern South Dakota." Kent State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=kent1385078311.

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Manthri, Sandeep. "EXPERIMENTAL INVESTIGATION OF PCD COMPACT CORE DRILL PERFORMANCE ON BASALT SIMULATING SUSTAINABLE DRY DRILLING ON MARS." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/495.

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Missions to Mars aim to characterize rock and subsurface soil samples and possibly bring some back to Earth for more thorough and sophisticated examination. The Martian surface is covered with basalt which has high compressive strength (andamp;gt;130 MPa), and is more difficult to drill than the much softer sedimentary formations that are presently being drilled using diamond core drills. The main objective of this thesis work is to provide the requisite groundwork towards the development of improved and sustainable drills for subsurface drilling applications on Mars, when their goals are obtaining samples. Since progressive drill-wear is substantial in sustained drilling, the experiments were designed and conducted to study the tool-wear mechanisms and understand the associated effects on drilling performance in subsurface drilling of basalt. Core drilling experiments are conducted with different drill geometries and cutting conditions in a Martian simulant, basaltic rock; monitoring thrust force, torque and measuring tool-wear for a series of successive depth-increments. Based on the experimental results an optimization model has been developed for maximizing drilling depth with minimum tool-wear. This preliminary work will help the development of smart and sustainable drills for dry drilling applications for future NASA missions to Mars.
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Books on the topic "Drill core"

1

Cores and core logging for geologists. Caithness, Scotland: Whittles, 1990.

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Prouse, D. E. Manitoba's drill core libraries system. Winnipeg: Manitoba Energy and Mines, Mines Branch, 1989.

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Prouse, D. E. Manitoba's drill core libraries system. Winnipeg: Manitoba Energy and Mines, Mines Branch, 1989.

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Ashley, Roger P. Lithology, petrography, and geochemistry of three cores from the Goldfield mining district, Nevada. [Denver, Colo.?]: U.S. Dept. of the Interior, Geological Survey, 1990.

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Wrucke, Chester T. Lithology and geochemistry of core from U.S. Geological Survey deep drill hole at Indian Creek and discussion of core from a drill hole near Gold Acres, Shoshone Range, Nevada. [Reston, Va.?]: U.S. Geological Survey, 1991.

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Society of Core Analysts European Core Analysis Symposium (3rd 1992 Paris, France). Advances in core evaluation. [s.l.]: Gordon & Breach, 1993.

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Society of Core Analysts European Core Analysis Symposium (2nd 1991 London, England). Advances in core evaluation. Philadelphia: Gordon and Breach, 1991.

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R, Ege John. Core index: A numerical core-logging procedure for estimating rock quality. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1987.

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Ege, John R. Core index: A numerical core-logging procedure for estimating rock quality. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1987.

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Ege, John R. Core index: A numerical core-logging procedure for estimating rock quality. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1987.

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Book chapters on the topic "Drill core"

1

Wang, Da, Wei Zhang, Xiaoxi Zhang, Guolong Zhao, Ruqiang Zuo, Jialu Ni, Gansheng Yang, et al. "Diamond Core Drill Bit." In Springer Geology, 183–209. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46557-8_6.

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Parbhakar-Fox, Anita, Nathan Fox, Jake Moltzen, and Bernd Lottermoser. "Chemical Staining Techniques for Drill Core Characterization." In Environmental Indicators in Metal Mining, 97–114. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-42731-7_6.

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Gelfgat, M. Ya, R. S. Alikin, and Ya P. Stanko. "Technology of Ultradeep Core Drilling Without Pulling out Drill Pipes." In Super-Deep Continental Drilling and Deep Geophysical Sounding, 211–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-50143-2_20.

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Gundestrup, N. S., and S. J. Johnsen. "A battery powered, instrumented deep ice core drill for liquid filled holes." In Greenland Ice Core: Geophysics, Geochemistry, and the Environment, 19–22. Washington, D. C.: American Geophysical Union, 1985. http://dx.doi.org/10.1029/gm033p0019.

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Price, J. D., J. P. Hogan, J. Payne, and M. C. Gilbert. "Investigation of the Mount Scott Granite Drill Core, Wichita Mountains, Oklahoma." In Proceedings of the International Conferences on Basement Tectonics, 287–88. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5098-9_42.

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Hocheng, H., and C. C. Tsao. "Computerized Tomography and C-Scan for Measuring Drilling-Induced Delamination in Composite Material Using Twist Drill and Core Drill." In Progress of Precision Engineering and Nano Technology, 16–20. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-430-8.16.

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Khursevich, Galina K., Eugene B. Karabanov, Mikhail I. Kuzmin, Douglas F. Williams, Alexander A. Prokopenko, and Svetlana A. Fedenya. "Diatom Succession in Upper Miocene Sediments of Lake Baikal from the BDP-98 Drill Core." In Long Continental Records from Lake Baikal, 271–82. Tokyo: Springer Japan, 2003. http://dx.doi.org/10.1007/978-4-431-67859-5_17.

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Xu, Deyi, Bang Qin Feng, Changhai Tan, and Qiuming Cheng. "Distribution Study of Ore-Sourced Elements from a Long Drill-Core in a Loess-Covered Area." In Geostatistical and Geospatial Approaches for the Characterization of Natural Resources in the Environment, 491–95. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-18663-4_74.

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Ostertag, Rolf, and Wolfgang Gasse. "Continuous Deposits of the Ries Crater, Germany: Sedimentological and Micropaleontological Investigations of NASA Drill Core D." In Research in Terrestrial Impact Structures, 69–93. Wiesbaden: Vieweg+Teubner Verlag, 1987. http://dx.doi.org/10.1007/978-3-663-01889-6_4.

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Reimold, Wolf Uwe, and Christian Koeberl. "Petrography and Geochemistry of a Deep Drill Core from the Edge of the Morokweng Impact Structure, South Africa." In Impact Studies, 271–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55463-6_11.

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Conference papers on the topic "Drill core"

1

Wilner, Joel, and William H. Amidon. "PRELIMINARY RESULTS: DEEP DRILL CORE THERMOCHRONOLOGY, SOUTHEASTERN CONNECTICUT." In 53rd Annual GSA Northeastern Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018ne-311216.

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Gunther, Christian, Nils Jansson, Marcus Liwicki, and Foteini Simistira-Liwicki. "Towards a Machine Learning Framework for Drill Core Analysis." In 2021 Swedish Artificial Intelligence Society Workshop (SAIS). IEEE, 2021. http://dx.doi.org/10.1109/sais53221.2021.9484025.

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Timoney, Ryan, Patrick Harkness, Xuan Li, Aleksandrs Bolhovitins, Andy Cheney, and Margaret Lucas. "The Development of the European UItrasonic Planetary Core Drill (UPCD)." In AIAA SPACE 2015 Conference and Exposition. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-4553.

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Contreras, Cecilia, Mahdi Khodadadzadeh, Laura Tusa, Pedram Ghamisi, and Richard Gloaguen. "A Machine Learning Technique for Drill Core Hyperspectral Data Analysis." In 2018 9th Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing (WHISPERS). IEEE, 2018. http://dx.doi.org/10.1109/whispers.2018.8747022.

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Contreras, Cecilia, Mahdi Khodadadzadeh, Laura Tusa, Christina Loidolt, Raimon Tolosana-Delgado, and Richard Gloaguen. "Geochemical And Hyperspectral Data Fusion For Drill-Core Mineral Mapping." In 2019 10th Workshop on Hyperspectral Imaging and Signal Processing: Evolution in Remote Sensing (WHISPERS). IEEE, 2019. http://dx.doi.org/10.1109/whispers.2019.8921163.

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HOCHENG, H., and C. C. TASO. "ANALYSIS OF DELAMINATION IN DRILLING COMPOSITE MATERIALS USING CORE DRILL." In Proceedings of the Third Australasian Congress on Applied Mechanics. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812777973_0046.

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Kruse, F. A., O. Weatherbee, W. Peppin, R. Bedell, W. Calvin, and J. V. Taranik. "HSI mineral mapping from airborne, outcrop, and drill-core perspectives." In SPIE Defense, Security, and Sensing, edited by G. Charmaine Gilbreath and Chadwick T. Hawley. SPIE, 2010. http://dx.doi.org/10.1117/12.855445.

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Calvin, Wendy M., and Brandon Rasmussen. "MINERALOGY IN DRILL CORE FROM HAWAII: AN ANALOG FOR MARS." In 113th Annual GSA Cordilleran Section Meeting - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017cd-292697.

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Tusa, Laura, Louis Andreani, Eric Pohl, I. Cecilia Contreras, Mahdi Khodadadzadeh, Richard Gloaguen, and Jens Gutzmer. "Extraction of Structural and Mineralogical Features from Hyperspectral Drill-Core Scans." In IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2018. http://dx.doi.org/10.1109/igarss.2018.8517786.

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Speta, Michelle, Benoit Rivard, Jilu Feng, Michael Lipsett, and Murray Gingras. "Hyperspectral imaging for the characterization of athabasca oil sands drill core." In IGARSS 2013 - 2013 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2013. http://dx.doi.org/10.1109/igarss.2013.6723248.

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Reports on the topic "Drill core"

1

Kjarsgaard, B. A., D. A. Leckie, D. J. McIntyre, D. H. McNeil, J W Haggart, L. Stasiuk, and J. Block. Smeaton kimberlite drill core, Fort à la Corne Field, Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/205737.

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Smith, S. L., and R. H. Rainbird. Soft - Sediment Deformation Structures in Overburden Drill Core, Quebec. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/122335.

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Francis, P. M. Test plan for core sampling drill bit temperature monitor. Office of Scientific and Technical Information (OSTI), October 1994. http://dx.doi.org/10.2172/10191533.

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Ziada, H. H. ,. Westinghouse Hanford. Buckling and dynamic analysis of drill strings for core sampling. Office of Scientific and Technical Information (OSTI), May 1996. http://dx.doi.org/10.2172/662035.

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Lindquist, B., D. Coker, and S. Lee. Three-dimensional imaging of drill core samples using synchrotron computed microtomography. Office of Scientific and Technical Information (OSTI), January 1993. http://dx.doi.org/10.2172/6878066.

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Witwer, K. S. Testing the propagation of flammable gasses in a core sampling drill string. Office of Scientific and Technical Information (OSTI), October 1996. http://dx.doi.org/10.2172/327499.

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Steele, K. G., C. L. Baker, and M. B. McClenaghan. Models of glacial stratigraphy determined from drill core, Matheson area, northeastern Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127368.

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Smith, S. Geochemical and lithological data from overburden drill cores, with descriptive core logs, Timmins to Smoky Falls, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/128164.

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Witwer, K. S. ,. Westinghouse Hanford. Report on ignitability testing of flammable gasses in a core sampling drill string. Office of Scientific and Technical Information (OSTI), December 1996. http://dx.doi.org/10.2172/325081.

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Chipera, S. J., D. T. Vaniman, B. A. Carlos, and D. L. Bish. Mineralogic variation in drill core UE-25 UZ{number_sign}16, Yucca Mountain, Nevada. Office of Scientific and Technical Information (OSTI), February 1995. http://dx.doi.org/10.2172/28334.

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