Epithermal Au-Ag and Related Deposits of the Hauraki Goldfield, Coromandel Volcanic Zone, New Zealand

Christie, Anthony B.; Simpson, Mark P.; Brathwaite, Robert L.; Mauk, Jeffrey L.; Simmons, S. W.

doi:10.2113/gsecongeo.102.5.785

Cited by 71 publications

(45 citation statements)

References 60 publications

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“…These types are based on their mineralogy and host rock associations as follows: (1) low sulphidation and andesite-hosted; and (2) low sulphidation and rhyolite-hosted. Low-sulphidation deposits are the focus of this study as most production is from low sulphidation andesite-hosted deposits (Christie & Brathwaite 2003;Christie et al 2007). These are predominantly quartz veins carrying electrum and sulphides in andesite and dacite lava, for example at Martha Mine in Waihi.…”

Section: New Zealand Epithermal Gold Depositsmentioning

confidence: 99%

Geochemistry in prospectivity modelling: investigating gold mineralization in the Taupo Volcanic Zone, New Zealand

Payne¹,

Peters²

2015

GEEA

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Prospectivity modelling of epithermal gold mineralization has been completed over the Taupo Volcanic Zone (TVZ), North Island, New Zealand. The TVZ is unique in that it is a present-day analogue of the environment in which many epithermal ore deposits, such as in the adjacent Hauraki Goldfield in the Coromandel Volcanic Zone, are formed. The model utilizes compiled digital data including: historical exploration data; geological data from the Institute of Geological and Nuclear Sciences Quarter Million Mapping Programme over Rotorua, Hawkes Bay and Taranaki; recent Glass Earth Gold Ltd geophysical data; and historic exploration geochemical data from rock-chip and stream sediment samples. The weights of evidence modelling technique was used to determine spatial correlations between known gold prospects and predictive maps, created from the available data, representing each component of the currently accepted mineral system model for epithermal gold. Despite the limited coverage of several data-sets, the resulting prospectivity model over the TVZ confirms potential for gold mineralization. The most prospective areas are those associated with active and inactive hydrothermal systems represented by areas of hydrothermal alteration. The Rotokawa and Waiotapu hydrothermal centres have been identified as particularly prospective, suggesting these systems may represent modern analogues of epithermal gold mineralization.

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Section: New Zealand Epithermal Gold Depositsmentioning

confidence: 99%

Geochemistry in prospectivity modelling: investigating gold mineralization in the Taupo Volcanic Zone, New Zealand

Payne¹,

Peters²

2015

GEEA

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“…The majority of production is from low sulphidation andesite-hosted deposits (Christie and Brathwaite, 2003;Christie et al, 2007). These are predominantly quartz veins carrying electrum and sulphides in andesite and dacite lava, for example at Martha Mine in Waihi.…”

Section: New Zealand Epithermal Gold Depositsmentioning

confidence: 99%

“…These are predominantly quartz veins carrying electrum and sulphides in andesite and dacite lava, for example at Martha Mine in Waihi. There has been minor production from rhyolite-hosted deposits that consist of electrum acanthite and pyrite in chalcedonic and vuggy quartz veins (Brathwaite and Christie, 2000;Christie et al, 2007). Ore-grade gold-silver mineralisation is currently being deposited in several active geothermal fields of the TVZ and extinct geothermal systems occur on the western side of the zone (Hedenquist, 1985;Christie and Brathwaite, 2003;Simmons and Brown, 2007).…”

Section: New Zealand Epithermal Gold Depositsmentioning

confidence: 99%

From 2D to 3D: Prospectivity modelling in the Taupo Volcanic Zone, New Zealand

Payne¹,

Cunningham²,

Peters³

et al. 2015

Ore Geology Reviews

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“…The Coromandel Peninsula contains a sequence of late Miocene to early Quaternary subaerial, andesitic to rhyolitic volcanic rocks of the Coromandel Volcanic Zone (Skinner 1986;Christie et al 2007) (Fig. 1).…”

Section: Geology and History Of Martha Minementioning

confidence: 99%

Effects of mine expansion on geochemical predictions of pit lake water quality: an example from Martha Mine, Waihi, New Zealand

Castendyk

Webster-Brown

2010

New Zealand Journal of Geology and Geophysics

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The expansion of open pit mines beyond initial size estimates is a common occurrence in the mining industry, particularly where ore values unexpectedly increase, and where new areas of high-grade ore are identified during mining. The decision to expand a pit should be based not only on expected profits, but also on updated predictions of pit lake water quality based upon the proposed mine geometry. The shape of the pit affects several variables used to generate these predictions, including pit hydrology, wall-rock mineralogy, lake water balance, and physical limnology. A review of pre-expansion geochemical models of the Martha Mine illustrates that changes in the wall-rock composition alone may increase the predicted pH of the pit lake from B5.0 to 6.5. This example underscores the need to update pit lake water quality predictions before open pit mines are expanded in order to best manage environmental risks.

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Epithermal Au-Ag and Related Deposits of the Hauraki Goldfield, Coromandel Volcanic Zone, New Zealand

Cited by 71 publications

References 60 publications

Geochemistry in prospectivity modelling: investigating gold mineralization in the Taupo Volcanic Zone, New Zealand

Geochemistry in prospectivity modelling: investigating gold mineralization in the Taupo Volcanic Zone, New Zealand

From 2D to 3D: Prospectivity modelling in the Taupo Volcanic Zone, New Zealand

Effects of mine expansion on geochemical predictions of pit lake water quality: an example from Martha Mine, Waihi, New Zealand

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