Journal articles on the topic 'Wairakei'

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1

GRANT, MALCOLM A. "MATHEMATICAL MODELLING OF WAIRAKEI GEOTHERMAL FIELD." ANZIAM Journal 50, no. 3 (January 2009): 426–34. http://dx.doi.org/10.1017/s1446181109000212.

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AbstractMathematical modelling of Wairakei geothermal field is reviewed, both lumped-parameter and distributed-parameter models. In both cases it is found that reliable predictions require five to ten years of history for calibration. With such calibration distributed-parameter models are now used for field management. A prudent model of Wairakei, constructed without such historical data, would underestimate field capacity and provide only general projections of the type of changes in surface activity and subsidence.
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2

Lichiti,, Keith A., and Lewis G. Bacon,. "Corrosion in Wairakei Steam Pipelines." Corrosion Reviews 17, no. 3-4 (August 1999): 219–36. http://dx.doi.org/10.1515/corrrev.1999.17.3-4.219.

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3

Herzer, Richard H. "Editorial." Energy Exploration & Exploitation 6, no. 2 (April 1988): i—iv. http://dx.doi.org/10.1177/014459878800600201.

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4

Esteva, Luis. "Earthquake engineering research and practice in Mexico after the 1985 earthquakes." Bulletin of the New Zealand Society for Earthquake Engineering 20, no. 3 (September 30, 1987): 159–200. http://dx.doi.org/10.5459/bnzsee.20.3.159-200.

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5

Glynn-Morris, Trystan, Tom King, and Ralph Winmill. "Drilling history and evolution at Wairakei." Geothermics 38, no. 1 (March 2009): 30–39. http://dx.doi.org/10.1016/j.geothermics.2008.11.001.

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6

Hunt, Trevor M., Chris J. Bromley, George F. Risk, Steve Sherburn, and Suprijadi Soengkono. "Geophysical investigations of the Wairakei Field." Geothermics 38, no. 1 (March 2009): 85–97. http://dx.doi.org/10.1016/j.geothermics.2008.11.002.

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7

Bibby, H. M., and A. W. Hurst. "Tilt monitoring at wairakei geothermal field." Geothermics 19, no. 4 (January 1990): 385–96. http://dx.doi.org/10.1016/0375-6505(90)90040-i.

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8

Self, Stephen, and James Healy. "Wairakei Formation, New Zealand: Stratigraphy and correlation." New Zealand Journal of Geology and Geophysics 30, no. 1 (January 1987): 73–86. http://dx.doi.org/10.1080/00288306.1987.10422194.

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9

Froggatt, Paul, Russell Howorth, Colin Vucetich, James Healy, C. J. N. Wilson, and Stephen Self. "Wairakei Formation, New Zealand: Stratigraphy and correlation." New Zealand Journal of Geology and Geophysics 31, no. 3 (July 1988): 391–96. http://dx.doi.org/10.1080/00288306.1988.10417786.

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10

Brown, Kevin L., and Lew G. Bacon. "Pilot plant experiments at Wairakei Power Station." Geothermics 38, no. 1 (March 2009): 64–71. http://dx.doi.org/10.1016/j.geothermics.2008.11.004.

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11

Bromley, Chris, Kerin Brockbank, Trystan Glynn-Morris, Michael Rosenberg, Michael Pender, Michael O'Sullivan, and Steve Currie. "Geothermal subsidence study at Wairakei–Tauhara, New Zealand." Proceedings of the Institution of Civil Engineers - Geotechnical Engineering 166, no. 2 (April 2013): 211–23. http://dx.doi.org/10.1680/geng.12.00040.

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12

Daysh, Stephen, and Mark Chrisp. "Environmental planning and consenting for Wairakei: 1953–2008." Geothermics 38, no. 1 (March 2009): 192–99. http://dx.doi.org/10.1016/j.geothermics.2008.08.002.

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13

Bromley, Chris J. "Groundwater changes in the Wairakei–Tauhara geothermal system." Geothermics 38, no. 1 (March 2009): 134–44. http://dx.doi.org/10.1016/j.geothermics.2008.11.007.

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14

Thain, Ian A., and Brian Carey. "Fifty years of geothermal power generation at Wairakei." Geothermics 38, no. 1 (March 2009): 48–63. http://dx.doi.org/10.1016/j.geothermics.2008.12.004.

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15

Allis, Rick G. "Review of subsidence at Wairakei field, New Zealand." Geothermics 29, no. 4-5 (August 2000): 455–78. http://dx.doi.org/10.1016/s0375-6505(00)00016-x.

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16

Tokeley, A. H., and D. P. Brown. "Ohaaki Power Station: Geothermal Development in New Zealand." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 206, no. 1 (February 1992): 41–51. http://dx.doi.org/10.1243/pime_proc_1992_206_006_02.

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The recent geothermal power station development at Ohaaki, New Zealand, is discussed, highlighting the advances in both the technology and environmental acceptability of such plant since the pioneering development at nearby Wairakei. Development strategies for the geothermal field and major design decisions relating to the power station and steamfield systems are outlined and the systems themselves are briefly described.
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17

Glover, Richard B., Edward K. Mroczek, and J. Bruce Finlayson. "Fumarolic gas chemistry at Wairakei, New Zealand, 1936–1998." Geothermics 30, no. 5 (October 2001): 511–25. http://dx.doi.org/10.1016/s0375-6505(01)00006-2.

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18

Pender, Michael, Graham Ramsay, Trystan Glynn-Morris, Bridget Lynne, and Chris Bromley. "Rock compressibility at the Wairakei–Tauhara geothermal field, New Zealand." Proceedings of the Institution of Civil Engineers - Geotechnical Engineering 166, no. 2 (April 2013): 224–34. http://dx.doi.org/10.1680/geng.12.00034.

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19

Allis, Richard G., and Trevor M. Hunt. "Analysis of exploitation‐induced gravity changes at Wairakei Geothermal Field." GEOPHYSICS 51, no. 8 (August 1986): 1647–60. http://dx.doi.org/10.1190/1.1442214.

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Gravity changes (corrected for subsidence) of up to -1 000 (±300) μGal have occurred in the [Formula: see text] area of the production bore field at Wairakei, and smaller decreases extend over a [Formula: see text] surrounding area. The largest part of these decreases occurred during the 1960s; since then the net gravity change for the whole field has been zero, indicating mass flow equilibrium. The principal causes of gravity change have been deep liquid pressure drawdown which resulted in formation of a steam zone, subsequent saturation changes in the steam zone, liquid temperature decline, and groundwater level changes. Gravity models suggest saturation of the steam zone was 0.7 (±0.1) in 1962 and decreased to 0.6 by 1972. Gravity increases in the northern and eastern bore field since the early 1970s are attributed to cool water invading the steam zone.
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20

Mannington, Warren, Michael O’Sullivan, and David Bullivant. "Computer modelling of the Wairakei–Tauhara geothermal system, New Zealand." Geothermics 33, no. 4 (August 2004): 401–19. http://dx.doi.org/10.1016/j.geothermics.2003.09.009.

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21

Bibby, Hugh M., George F. Risk, T. Grant Caldwell, and Wiebke Heise. "Investigations of deep resistivity structures at the Wairakei geothermal field." Geothermics 38, no. 1 (March 2009): 98–107. http://dx.doi.org/10.1016/j.geothermics.2008.07.002.

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22

O'Sullivan, Michael J., Angus Yeh, and Warren I. Mannington. "A history of numerical modelling of the Wairakei geothermal field." Geothermics 38, no. 1 (March 2009): 155–68. http://dx.doi.org/10.1016/j.geothermics.2008.12.001.

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23

Bolton, Richard S., Trevor M. Hunt, Tom R. King, and Geoffrey E. K. Thompson. "Dramatic incidents during drilling at Wairakei Geothermal Field, New Zealand." Geothermics 38, no. 1 (March 2009): 40–47. http://dx.doi.org/10.1016/j.geothermics.2008.12.002.

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24

Allis, Rick G., and Xiaoyong Zhan. "Predicting subsidence at Wairakei and Ohaaki geothermal fields, New Zealand." Geothermics 29, no. 4-5 (August 2000): 479–97. http://dx.doi.org/10.1016/s0375-6505(00)00017-1.

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25

Whitehead, N. E., B. J. Barry, R. G. Ditchburn, C. J. Morris, and M. K. Stewart. "Systematics of radon at the Wairakei geothermal region, New Zealand." Journal of Environmental Radioactivity 92, no. 1 (January 2007): 16–29. http://dx.doi.org/10.1016/j.jenvrad.2006.09.003.

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26

Kissling, Warwick M., Kevin L. Brown, Michael J. O'Sullivan, Stephen P. White, and David P. Bullivant. "Modelling chloride and CO2 chemistry in the wairakei geothermal reservoir." Geothermics 25, no. 3 (June 1996): 285–305. http://dx.doi.org/10.1016/0375-6505(96)00009-0.

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27

Taksavasu, Tadsuda, Thomas Monecke, and T. Reynolds. "Textural Characteristics of Noncrystalline Silica in Sinters and Quartz Veins: Implications for the Formation of Bonanza Veins in Low-Sulfidation Epithermal Deposits." Minerals 8, no. 8 (August 2, 2018): 331. http://dx.doi.org/10.3390/min8080331.

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Silica sinters forming at the Wairakei geothermal power plant in New Zealand are composed of noncrystalline opal-A that deposited rapidly from cooling geothermal liquids flashed to atmosphere. The sinter is laminated with alternating layers of variably compacted silicified filamentous microbes encased by chains of fused silica microspheres. Microscopic inspection of bonanza quartz vein samples from the Buckskin National low-sulfidation epithermal precious metal deposit in Nevada showed that colloform bands in these veins exhibit relic microsphere textures similar to those observed in the silica sinters from the Wairakei power plant. The textural similarity suggests that the colloform bands were originally composed of noncrystalline opal-A that subsequently recrystallized to quartz. The colloform bands contain dendrites of electrum and naumannite that must have grown in a yielding matrix of silica microspheres deposited at the same time as the ore minerals, implying that the noncrystalline silica exhibited a gel-like behavior. Quartz bands having other textural characteristics in the crustiform veins lack ore minerals. This suggests that ore deposition and the formation of the colloform bands originally composed of compacted microspheres of noncrystalline silica are genetically linked and that ore deposition within the bonanza veins was only episodic. Supersaturation of silica and precious metals leading to the formation of the colloform bands may have occurred in response to transient flashing of the hydrothermal liquids. Flashing of geothermal liquids may thus represent a key mechanism in the formation of bonanza precious metal grades in low-sulfidation epithermal deposits.
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28

Harvey, Colin Charles. "Mixed-Layer Clay Geothermometry in the Wairakei Geothermal Field, New Zealand." Clays and Clay Minerals 39, no. 6 (1991): 614–21. http://dx.doi.org/10.1346/ccmn.1991.0390607.

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29

van Manen, Saskia M., and Erin Wallin. "Ground temperature profiles and thermal rock properties at Wairakei, New Zealand." Renewable Energy 43 (July 2012): 313–21. http://dx.doi.org/10.1016/j.renene.2011.11.032.

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30

Allis, Rick, Chris Bromley, and Steve Currie. "Update on subsidence at the Wairakei–Tauhara geothermal system, New Zealand." Geothermics 38, no. 1 (March 2009): 169–80. http://dx.doi.org/10.1016/j.geothermics.2008.12.006.

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31

Bixley, Paul F., Alan W. Clotworthy, and Warren I. Mannington. "Evolution of the Wairakei geothermal reservoir during 50 years of production." Geothermics 38, no. 1 (March 2009): 145–54. http://dx.doi.org/10.1016/j.geothermics.2008.12.007.

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32

Rosenberg, Michael D., Greg Bignall, and Andrew J. Rae. "The geological framework of the Wairakei–Tauhara Geothermal System, New Zealand." Geothermics 38, no. 1 (March 2009): 72–84. http://dx.doi.org/10.1016/j.geothermics.2009.01.001.

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33

Wilson, C. J. N., V. R. Switsur, and A. P. Ward. "A new 14C age for the Oruanui (Wairakei) eruption, New Zealand." Geological Magazine 125, no. 3 (May 1988): 297–300. http://dx.doi.org/10.1017/s0016756800010232.

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AbstractThe Oruanui eruption was the largest known outburst of Taupo volcano, New Zealand, and is among the larger Quaternary eruptions documented. The eruption deposits are variously known as the Oruanui, Wairakei, Kawakawa Tephra, or Aokautere Ash formations, and represent a bulk volume probably exceeding 500 km3. Four new 14C age determinations on carbonized vegetation in the non-welded Oruanui ignimbrite are combined to give a conventional age of 22590±230 yr b.p. Compared with the previously accepted figure of 20000 yr b.p., this new age resolves the anomaly of apparently older 14C ages being obtained from a demonstrably younger New Zealand deposit, and strengthens correlation of this eruption with an Antarctic ice-core acid anomaly. The trace of this eruption has great potential as a time-plane marker in the Antarctic just prior to the last glacial maximum. The close similarity in ages between the Oruanui and a comparable sized eruption (Ito/Aira-Tn) in Japan suggests that this period of activity may represent the best chance of resolving any linkages between large-scale explosive silicic volcanism and climate changes.
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34

Bolton, Richard S. "The early history of Wairakei (with brief notes on some unforeseen outcomes)." Geothermics 38, no. 1 (March 2009): 11–29. http://dx.doi.org/10.1016/j.geothermics.2008.02.004.

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35

Hunt, Trevor M., and Warwick M. Kissling. "Determination of reservoir properties at Wairakei Geothermal Field using gravity change measurements." Journal of Volcanology and Geothermal Research 63, no. 3-4 (November 1994): 129–43. http://dx.doi.org/10.1016/0377-0273(94)90070-1.

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36

Sparling, G. P., R. Lewis, L. A. Schipper, P. Mudge, and M. Balks. "Changes in soil total C and N contents at three chronosequences after conversion from plantation pine forest to dairy pasture on a New Zealand Pumice soil." Soil Research 52, no. 1 (2014): 38. http://dx.doi.org/10.1071/sr13102.

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The large amounts of carbon (C) and nitrogen (N) sequestered as organic matter in soils have implications for global and national C and N balances and greenhouse gas emissions. Changes in soil management can affect the amount of C and N stored in soil. We investigated the change in land use from radiata pine plantation to ryegrass–white clover dairy pasture on the total C and N content of Taupo Pumice Soil. Samples were taken at three study sites (Atiamuri, Tokoroa and Wairakei) in North Island, New Zealand. Soils were cored to 60 cm depth and subsampled by soil horizon, and bulk density cores were taken from soil pits. A chronosequence of sites was obtained after conversion from pines to pasture. Long-term pastures (40–80 years) and mature pine plantations were included for further comparison. Regression analyses were completed after logarithmic transformation of the time data. The data were highly variable, but significant (P < 0.05) increases in total C and N were found at the Atiamuri and Wairakei sites. However, there was no significant change in the total C content of the profile at the Tokoroa site. Increases in total C and N were greatest in the Ap horizon and were most rapid 1–5 years after conversion. Overall rates of increase in the first 10 years after conversion were 0.167 kg C m–2 year–1 for total C and 0.032 kg N m–2 year–1 for total N, dropping to 0.027 kg C and 0.005 kg N m–2 year–1 for the 10–50-year period. The change in land use from plantation forest to dairy pasture has resulted in a moderate increase or no change in soil storage of C. Compared with total C, increases in total N storage were proportionately greater in all three examples of this Taupo Pumice Soil.
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37

Smith, B. Y., S. J. Turner, and K. A. Rodgers. "Opal-A and associated microbes from Wairakei, New Zealand: the first 300 days." Mineralogical Magazine 67, no. 3 (June 2003): 563–79. http://dx.doi.org/10.1180/0026461036730118.

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AbstractAll samples of silica sinter, <2 y old taken from the discharge drain of the Wairakei geothermal power station and the Rainbow Terrace of Orakei Korako, consist of non-crystalline opal-A. This silica phase deposits directly upon the concrete drain wall and filamentous templets, extending from this wall, afforded by the microbial community present in the drain, whose nature was determined by a culture- independent strategy that entailed construction, fingerprinting and sequencing of a 16S clone library. The bacterial community is dominated by five major groups of organisms, present in approximately equal proportions, and which account for ∼50% of the community. None of the 16S sequences from these dominant groups yielded a perfect match with 16S sequences for named organisms in the international databases. However one dominant group clusters withHydrogenophilus thermoluteus,a thermophilic filamentous bacterium, and two cluster with putatively thermophilic members of theCyanobacteriaand green non-sulphur bacteria respectively. Initial opal-A deposits rapidly as agglomerations of silica nanospheres that, in turn, form chains of coalesced, oblate, microspheres <0.4 x 0.2 mm about the barbicel-like filaments, to produce a mat of fine woven strands. The majority of individual filaments are <8 μm long and 0.8 mm wide but may be up to 55 mm long by 1 mm wide. Where laminar flow dominates, most strands develop parallel to the drain current but some strands crisscross while others protrude above the mat surface. Where flow is turbulent, strands lack preferred orientation and some adopt a helical form. In general, following deposition, the values of the scattering broadband at half (FWHM) and three quarters (FWTM) of the maximum intensity decrease with increasing sample age. The behaviour of the band at one quarter maximum intensity (FWQM) is less consistent, but, in general, the youngest sinters possess the highest FWQM, FWHM and FWTM values that prove independent of fabric type. Opal-A silica matures following its removal from the parent fluid, especially where the sinter surface is filmed by water. A continual movement of silica is shown by a second generation of microspheres formed on the silica mat surface, by an increase in size of the initial microspheres, and by an increase in maximum intensity of the X-ray scattering broadbands. Similar silica aging behaviour occurs among young sinters developed upon microbial mats at Orakei Korako. The deposition and aging processes accord with the known behaviour of juvenile opaline silica in both natural and artificial systems whose pH, temperature and dissolved salt content are similar to Wairakei and Rainbow terrace: gelling of silica is favoured by the high pH (∼8.3) and temperature (∼60°C) of the Wairakei discharge fluid but the high dissolved salt content of the water (Na+= 930 μg/g, Ca2+= 12 μg/g, Cl = 1500 μg/g) and abundant microbial community facilitate rapid and copious flocculation of solid silica within the drain, in contrast to the slower accumulation on the natural sinter terrace at lower temperature (30—45°C) from less saline dilute bicarbonate-chloride waters (Na+= 180 μg/g, Ca2+= 0.2 μg/g, Cl = 400 μg/g, pH = 8.1).
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38

Hunt, Trevor M., and Duncan J. Graham. "Gravity changes in the Tauhara sector of the Wairakei–Tauhara geothermal field, New Zealand." Geothermics 38, no. 1 (March 2009): 108–16. http://dx.doi.org/10.1016/j.geothermics.2008.12.003.

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39

Pound, BG, GA Wright, and RM Sharp. "Electrochemical Phase Diagrams for the Fe/S/H2O System under Geothermal Conditions." Australian Journal of Chemistry 38, no. 5 (1985): 643. http://dx.doi.org/10.1071/ch9850643.

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Previously published electrochemical phase (potential-pH) diagrams for the Fe/S/H2O system at elevated temperatures are assessed. It is concluded that the potential-pH equations derived by Biernat and Robins1 can be used to provide reliable diagrams over the temperature range 298-573 K. These equations were used to derive a set of diagrams relevant to geothermal fluids in general terms, so that the corrosion products of iron and ferrous alloys immersed in these fluids may be predicted. In addition, diagrams are presented for geothermal fluids in the Broadlands and Wairakei fields in New Zealand. The significant changes in the E-pH diagrams as the temperature increases over the range 298-573 K are that the region of stability for Fe(OH)3- widens and the regions of stability for FeS2 and Fe3O4 and, at higher temperatures, FeS, shrink in size.
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40

Timperley, M. H., and L. F. Hill. "Discharge of mercury from the Wairakei geothermal power station to the Waikato River, New Zealand." New Zealand Journal of Marine and Freshwater Research 31, no. 3 (September 1997): 327–36. http://dx.doi.org/10.1080/00288330.1997.9516770.

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41

Dodd, M. B., G. W. Sheath, and S. Richardson. "Development of subterranean clover(Trifolium subterraneumL.) genotypes for New Zealand pastures 2. Wairakei persistence evaluation." New Zealand Journal of Agricultural Research 38, no. 1 (March 1995): 49–56. http://dx.doi.org/10.1080/00288233.1995.9513102.

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42

Sylvania, Marchellina S., Mike O’Sullivan, John O’Sullivan, and Kerin Brockbank. "Modelling of Completion Tests in Two Wells of the Wairakei – Tauhara Geothermal System, New Zealand." IOP Conference Series: Earth and Environmental Science 254 (April 29, 2019): 012025. http://dx.doi.org/10.1088/1755-1315/254/1/012025.

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43

White, Paul A., and Trevor M. Hunt. "Simple modelling of the effects of exploitation on hot springs, Geyser Valley, Wairakei, New Zealand." Geothermics 34, no. 2 (April 2005): 184–204. http://dx.doi.org/10.1016/j.geothermics.2004.07.003.

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44

Zarrouk, Sadiq, Michael O'Sullivan, Adrian Croucher, and Warren Mannington. "Numerical modelling of production from the Poihipi dry steam zone: Wairakei geothermal system, New Zealand." Geothermics 36, no. 4 (August 2007): 289–303. http://dx.doi.org/10.1016/j.geothermics.2007.03.006.

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45

McNamara, D. D., S. D. Milicich, C. Massiot, P. Villamor, K. McLean, F. Sépulveda, and W. F. Ries. "Tectonic Controls on Taupo Volcanic Zone Geothermal Expression: Insights From Te Mihi, Wairakei Geothermal Field." Tectonics 38, no. 8 (August 2019): 3011–33. http://dx.doi.org/10.1029/2018tc005296.

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46

Adlam, J. G. "Confronting Impediments to Enterprise: A Legal Perspective." Energy Exploration & Exploitation 6, no. 3 (June 1988): 173–88. http://dx.doi.org/10.1177/014459878800600301.

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This paper is an edited version of a paper presented to the New Zealand Oil Exploration Conference at Wairakei, New Zealand, 1–3 July, 1987. The paper is an overview of the New Zealand legal environment as it affects petroleum explorers and their operations in New Zealand. It includes a brief summary of the New Zealand legal system and identifies the business structures commonly used and recognised under New Zealand law. It continues with an outline of the significant legal requirements governing petroleum exploration, including the Petroleum Act and Regulations (rights and obligations of Licensees), environmental and conservation laws. Overseas Investment Act and Regulations, Commerce Act. Fair Trading Act. taxation aspects of operations in New Zealand, the no-fault Accident Compensation scheme and other operational requirements. The paper concludes with comment on government participation, current government policy, the legal and administrative framework in which that policy is implemented and some comment on prospects for the future.
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47

MacFarlane, M. J., G. W. Sheath, and M. A. Tucker. "Evaluation of clovers in dry hill country 6. Subterranean and white clovers at Wairakei, New Zealand." New Zealand Journal of Agricultural Research 33, no. 4 (October 1990): 557–64. http://dx.doi.org/10.1080/00288233.1990.10428457.

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48

Glover, Richard B., and Edward K. Mroczek. "Chemical changes in natural features and well discharges in response to production at Wairakei, New Zealand." Geothermics 38, no. 1 (March 2009): 117–33. http://dx.doi.org/10.1016/j.geothermics.2008.12.008.

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49

Mazor, Emanuel, Adi Bosch, Michael K. Stewart, and John R. Hulston. "The geothermal system of Wairakei, New Zealand: physical processes and age estimates inferred from noble gases." Applied Geochemistry 5, no. 5-6 (September 1990): 605–24. http://dx.doi.org/10.1016/0883-2927(90)90059-e.

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50

Ciriaco, Anthony E., Sadiq J. Zarrouk, Anthony Downward, Julian McDowell, and Warren Mannington. "Experimental design for estimating the power potential of the Wairakei geothermal field, New Zealand: A retrospective analysis." Geothermics 104 (September 2022): 102443. http://dx.doi.org/10.1016/j.geothermics.2022.102443.

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