Gold-silver ore-grade precipitates from New Zealand thermal waters

Weissberg, B. G.

doi:10.2113/gsecongeo.64.1.95

Cited by 176 publications

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“…Grange (1937) reported 2 ppm gold and 120 ppm silver in the sinter from Whakarewarewa. The metal content of precipitates in some hot springs and boreholes in New Zealand ranged from < 1 to 85 ppm gold and from < 5 to 500 ppm silver (Weissberg, 1969). One of these springs, the Champagne Pool at W aiotapu, whose source is possibly as deep as 1.5 to 3 kilometers, has an areal extent of 7,000 square meters, a surface temperature of 70° to 75° C, and a pH ranging from 4.9 to 6.5.…”

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confidence: 99%

Gold content of water, plants, and animals

Jones¹

1970

Circular

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mentioning

confidence: 99%

Gold content of water, plants, and animals

Jones¹

1970

Circular

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“…Even if mineralisation occurred at slightly greater depths, a local geothermal gradient between 50 and lOO°C/km is implied. Deposition of metals such as As, Sb, and Au commonly occurs in nearsurface portions of active geothermal systems (Weissberg 1969;Ewers & Keays 1977) as a response to boiling and cooling; the Consolidated Lode may therefore represent a similar zone. Another similar Sb locality at Hindon, eastern Otago (grid ref.…”

Section: Discussionmentioning

confidence: 99%

Near-surface hydrothermal activity in the eastern Otago schist (Note)

Craw

McKeag

1987

New Zealand Journal of Geology and Geophysics

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The quartz-gold-stibnite-bearing Consolidated Lode at Nenthorn, eastern Otago, contains abundant prismatic quartz crystals and hydrothermal breccia. Fluid inclusion data imply that boiling occurred during mineral deposition at about 190°C at very shallow levels, possibly within 120 m of the surface. This type of vein system may be common in eastern Otago. Gold may be found beneath Sb and/or Hg deposits formed by similar near-surface hydrothermal activity.

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“…The high concentrations of Sb in the veins with the Au suggests that this may be one mechanism by which the Au in the Wind River veins was precipitated 97 from solution. The low amounts of As in the veins compared to the wallrocks may be related to its much greater solubility and ability to form stable colloidal dispersions (Weissberg, 1969), and it was not precipitated in the veins but was carried out into the wallrocks where it precipitated.…”

Section: Deep Geothermal Waters In Systems Such As Broadlands Steamboatmentioning

confidence: 99%

Geochemistry of alteration and mineralization of the Wind River gold prospect, Skamania County, Washington

McGowan¹

2000

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Differing degrees of alteration of the dikes relative to the most intensely altered pyroclastic rocks which they cut indicates a complex history of overlapping hydrothermal and volcanic activity at the prospect.Three associations of hydrothermal alteration have been recognized in the study area and represent expression of the hydrothermal system at differing lateral and vertical distances from the center of activity.The lava flow sequences overlying the pyroclastic rocks acted as a limited permeability barrier on the system, and hydrothermal activity was controlled mainly by structures.The main system alteration, Type 3, is found at the Wind River prospect, and is controlled by the northeast-trending No. 5 structure.The alteration is zoned and grades from a chlorite-smectite zone as the least altered to a smectite zone with decreasing chlorite and increasing illite toward a more intensely altered zone of calcite-Fe-carbonateillite-kaolinite-quartz. The inner zone is of illite-kaolinite-quartz, and includes the No. 5 structure, which consists of discontinuous stringers of fine-grained, sulfide-rich quartz in a clay matrix. Restricted "leaks" from the system produced Type 1 "rootless zone" alteration peripheral to the main system. These zones are characterized by localized, quartz-cemented breccias which may contain calcite, and which lack obvious structural controls. Alteration of wallrock and breccia clasts is weak to moderate. Geochemical anomalies of Sb were detected in these zones.

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Gold-silver ore-grade precipitates from New Zealand thermal waters

Cited by 176 publications

References 0 publications

Gold content of water, plants, and animals

Gold content of water, plants, and animals

Near-surface hydrothermal activity in the eastern Otago schist (Note)

Geochemistry of alteration and mineralization of the Wind River gold prospect, Skamania County, Washington

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