Sampling of gold ores for commercial purposes

Low-grade, finely disseminated refractory sulfide gold ores associated with high arsenic are ubiquitous resources all over the world. Since heap bio-oxidation is an economic and promising biotechnology to recover gold, low grade, high organic carbon and arsenic bearing gold ores from Zhesang Mines in China were chosen for this purpose to study the key factors that would affect biooxidation. Pyrite and arsenopyrite (particle size 0.002-0.22 mm) were the main minerals from Mineral Liberation Analysis (MLA). Column biooxidation and cyanidation of mineral size < 10 mm were evaluated for its potential for gold extraction. Results showed that temperature was the main factor influencing sulfide oxidation. 58-67 % of sulfide was oxidized at 35-45°C after > 240 days of biooxidation with mixed mesophiles, while higher sulfide-S dissolution (77%) was obtained at 60°C. Sulfide-S fraction distribution revealed higher mineral decomposition, finer fractions and eventually higher sulfide oxidation at 60°C. Jarosite and scorodite were found from the residues at 60°C by SEM and EDX, which implies higher temperature accelerated arsenic precipitation. No elemental sulfur was detected during the biooxidation at 35-60°C. After bio-oxidation, column cyanidation was successfully demonstrated recovery of gold from the residues, with gold extraction rate reaching 66%.

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Joint Processing and Interpretation of UAV-Geophysical and Geochemical Data in Prospecting for Gold Ores

10.3997/2214-4609.202052069 ◽

2020 ◽

Author(s):

S.V. Gachenko ◽

A.V. Parshin ◽

A.E. Budyak

Keyword(s):

Geochemical Data ◽

Joint Processing ◽

Gold Ores

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Liberation of different pyrite types in refractory gold ores

10.14264/b8c9a43 ◽

2021 ◽

Author(s):

◽

Ditend Tesh

Keyword(s):

Gold Ores ◽

Refractory Gold Ores ◽

Refractory Gold

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Types, structure and location of fractured gold pockets

Domestic geology ◽

10.47765/0869-7175-2021-10006 ◽

2021 ◽

pp. 62-75

Author(s):

Evgeny Nekrasov ◽

Alexander Nekrasov

Keyword(s):

Baikal Region ◽

Western Siberia ◽

South Urals ◽

High Grade ◽

Gold Ores ◽

Gold Ore

Fractured gold ore pockets of various types are classified and their structure is described in detail. This will allow explorationists to confirm high-grade gold ores, which is especially important in underground deposit mining. Gold pockets were mapped and analyzed by the author at deposits in Uzbekistan (Muruntau, Daugyz, Charmitan, Kokpatas), eastern Trans-Baikal region (Darasun, Balei, etc.) and Kochkarskoye (South Urals). Also, the paper describes the material collected by the author at gold pockets in Natalkinskoye, Nezhdaninskoye, Pavlik and Kyuchus deposits in Yakutia, Berikul in Western Siberia, Bakyrchik in Kazakhstan as well as deposits from Australia (Kalgoorlie, Northman, etc.), USA (Comstock, etc.), Canada (Porcupine), among others.

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