Gold-Bearing Arsenian Pyrite Determined by Microprobe Analysis, Cortez and Carlin Gold mines, Nevada

Wells, John D.; Mullens, Thomas E.

doi:10.2113/gsecongeo.68.2.187

Cited by 116 publications

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“…A guess on "average" con tent is made here because gold ore has epigenetic pyrite (Wells and Mullens, 1973;Radtke and others, 1972), and a background value of syngenetic pyrite is needed for comparison. I estimate the syngenetic pyrite content of laminated limestone to be about 0.25 percent and the epigenetic pyrite to be about 0.25 per cent.…”

Section: Petrography Of the Eaminated Limestonementioning

confidence: 99%

Stratigraphy, petrology, and some fossil data of the Roberts Mountains Formation, north-central Nevada

Mullens¹

1980

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Section: Petrography Of the Eaminated Limestonementioning

confidence: 99%

Stratigraphy, petrology, and some fossil data of the Roberts Mountains Formation, north-central Nevada

Mullens¹

1980

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“…In China, some of the SHDG deposits were found within or near former As and/or Hg mine areas (as in the Lannigou and Danzhai deposits). Most of the gold in the SHDG deposits is extremely finegrained (Wells and Mullens, 1973;Arehart et al, 1993a;Arehart, 1996) and occurs in hydrothermal arsenian pyrite, and less commonly in quartz, carbonaceous matter and finegrained phyllosilicates.…”

Section: Main Geochemical Characteristics Of Shdg Mineralizationmentioning

confidence: 99%

Geochemistry of the sediment-hosted disseminated gold deposits in Southwestern Guizhou Province, China /

Bao¹

2001

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“…The majority of the gold at Carlin is within or on pyrite. Wells and Mullens (1973) examined the occurrence of gold at the Carlin and Cortez Mines and found it mainly within arsenian pyrite and in arsenian rims around pyrite grains. Tafuri (1987) observed gold in the Mercur deposit in two forms, as free gold surrounded by quartz and calcite in disseminated ores, and as inclusions in marcasite.…”

Section: Occurrence Of Goldmentioning

confidence: 99%

“…Based on chemical analysis as well as Neutron Activation Analysis, gold shows positive correlation with arsenic, which may suggest that gold occurs in one or more of arsenopyrite, realgar, orpiment as well as arsenian pyrite. Wells and Mullens (1973) examined the occurrence of gold at the Carlin and Cortez Mines and found it mainly within arsenian pyrite and in arsenian rims around pyrite grains. § 3.…”

Section: Occurrence Of Goldmentioning

confidence: 99%

“…%, there was a significant percentage of the gold with the organic material, and concluded that organic carbon played an important role in the deposition of gold at Carlin. Wells and Mullens (1973) studied the distribution of gold in the Carlin and Cortez mines and found that most of the gold was within or on pyrite, and little, if any, gold was contained in carbonaceous material. Hausen and Park (1986) also examined the carbonaceous ore at Carlin and found that most of the gold was on and within pyrite and to a much lesser degree in the carbonaceous matter.…”

Section: Chapter Iv: Solid Hydrocarbon Concentrations and Their Relatmentioning

confidence: 99%

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Le lien genetique entre la mineralisation en or et en mercure et l evolution petrolifere

Lu¹

1994

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The Danzhai gold-mercury deposit is situated in the eastern region of Guizhou province, southwest of P. R. China.The Danzhai deposit is one of the gold-mercury-antimony-barite deposits in the Sandou-Danzhai ore belt, which is controlled by regional fault system Fi. The host rocks are Upper Cambrian and Lower Ordovician carbonates. Wall rock alteration is dominated by silicification and carbonatization. The major mineral assemblages consist of cinnabar, arsenopyrite, stibnite, pyrite and realgar, orpiment as well as barite. Chemical analyses show that gold is positively correlated with arsenic so that the gold may be mainly associated with arsenic minerals. The Au/Ag ratio is always greater than 1 in the gold ore. Hydrocarbons, particularly bitumen, are abundant in both the host rocks and the ore. The geological characteristics of the Danzhai gold-mercury deposit is quite similar to that of Carlin gold deposit in the western U.S.A except the Danzhai deposit is rich in organic matter and not associated with igneous rocks.A number of gold-mercury-antimony-barite deposits are distributed in or around the Majiang-Danzhai oil trap, and all of these deposits are present under the ancient interface between petroleum and oilfield brine (-500 m). Field observation shows that a variety of forms of hydrocarbon occur not only in the host carbonates but in the ore deposit as well. Patch-like bitumen, veinlet bitumen as well as stylolite-like bitumen host sulfide minerals such as arsenopyrite and cinnabar while metal sulfides such as cinnabar and gangue minerals also host bitumen. Besides bitumen, paraffin wax is also found in the deposit. An organic petrography study demonstrates that the bitumen in the minerals from the deposit is identical to the bitumen in the former Majiang-Danzhai oil trap. The bitumen is actually pyrobitumen, with a high reflectance, a mosaic texture, and an anisotropic nature but without fluorescence. The reflectance of bitumen from the deposit is high, varying from 2 to 3.8%, and the temperature calculated from this reflectance ranges from 150 to 210°C, indicating that the petroleum in the Majiang-Danzhai oil trap reached the thermal natural gas stage.

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Gold-Bearing Arsenian Pyrite Determined by Microprobe Analysis, Cortez and Carlin Gold mines, Nevada

Cited by 116 publications

References 0 publications

Stratigraphy, petrology, and some fossil data of the Roberts Mountains Formation, north-central Nevada

Stratigraphy, petrology, and some fossil data of the Roberts Mountains Formation, north-central Nevada

Geochemistry of the sediment-hosted disseminated gold deposits in Southwestern Guizhou Province, China /

Le lien genetique entre la mineralisation en or et en mercure et l evolution petrolifere

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