black carbonaceous shale and gold mining

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  Preg-robbing gold ores - ScienceDirect

  200511 · Publisher Summary Preg-robbing is an important phenomenon that inhibits gold recovery due to the presence of naturally occurring carbonaceous matter. In case of certain ores, gold recovery by cyanidation is limited by the presence of naturally occurring carbonaceous material that adsorbs gold from alkaline cyanide solution unless steps are …

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  Review of the extraction of key metallic values from black …

  2021121 · A gold (Au) concentrate was created from a 500 kg sample by gravimetric separation from Baltic basin black shale (Maardu phosphorite mine area). Initial Au concentration was 0.4 mg/kg, and the concentrate contained 29.74 mg/kg Au.

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  Environmental impact of mineralised black shales

  201951 · The black shale database is actively used in regional planning and by environmental authorities, research institutes and consulting companies. In the case of the historical black shale mining areas like in the Kupferschiefer in Germany, restoration measures have been applied to prevent further acid mine drainage.

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  The separation of gold and vanadium in carbonaceous gold ore …

  2019101 · Based on the strong oxidation of chlorine gas, the gold in the refractory gold ore can react with chlorine gas at high roasting temperature to generate gold chloride which has high volatility and low melting point, thereby realizing the effective non-cyanide extraction of gold from the refractory gold ore.

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  Petrographic Features and Carbonaceous Matter of the Black …

  4  · 4 Conclusions Thus, the study of black shale deposits of the Kumak ore field showed that the carbonaceous matter, represented by fine dispersed sedimentary organic matter and metamorphic graphite, is of a biogenic nature and experienced metamorphism under conditions of high-temperature subfacies of the greenschist facies.

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  A Carbonaceous Sedimentary Source-Rock Model for Carlin …

  2023526 · This paper presents evidence and arguments that carbonaceous sedimentary rocks were a source for Au and As in sediment-hosted orogenic and Carlin-type gold deposits and develops a corresponding genetic model. In this two-stage basin-scale model, gold and arsenic are introduced early into black shale and turbidite basins during …

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  (PDF) Spontaneous combustion of carbonaceous shale at an iron ore mine ...

  2023725 · In 2020, a premature detonation incident occurred at an iron ore mine where the waste material contains black carbonaceous shale units known to be associated with pyrite.

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  Multi-stage metal enrichment and formation of gold …

  2023328 · Black shales may serve as an important source of metals such as Co, Ni, or As, largely due to anoxic to euxinic conditions in association with high concentrations of sulfur leading to efficient scavenging and transport of metals from seawater into the seafloor sediment. We report on an unusual type of Au mineralization newly discovered in …

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  Synsedimentary to Early Diagenetic Gold in Black Shale …

  The Kopylovsky and Kavkaz gold deposits in the Artemovskiy ore cluster, Bodaybo district, hosted in terrigenous carbonaceous sequence of the Dogaldyn formation of the Upper Proterozoic Bodaybo group, are localized in cores of high-order anticlines. These deposits contain gold–sulfide and gold–sulfide–quartz ore types. Pyrite is the predominant ore …

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  gold ore in carbonaceous black shales – Grinding Mill China

  Local prediction of large-volume gold deposits in black shales …. MRD-13 Ore deposits associated with black shales: …Local prediction of large-volume gold deposits in black shales strata … within Lower Cambrian carbonaceous … » More detailed A Carbonaceous Sedimentary Source-Rock Model for Carlin-Type …. These processes produce regionally …

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