Arsenic minerals commonly occurring in Carlin-type gold deposits include orpiment and realgar and, more rarely, native arsenic and arsenopyrite. Other arsenic-bearing phases present include arsenian pyrite and stibnite and a number of thallium and mercury sulfides. Under conditions of constant temperature and pressure, the relative stability of arsenic minerals is a function of
Apr 26, 2007 The processing of gold bearing sulphide minerals which contain arsenopyrite and other complex arsenic sulphide minerals results in arsenic containing emissions and effluents which must be given careful consideration in relation to clean air and clean water standards. The sources of arsenic and the various process options for treating arsenical gold ores and
Sep 01, 1999 Arsenic as an indicator element for gold exploration in the region of the Xiangxi AuSbW deposit, NW Hunan, PR China. Author links open overlay panel. S.XYanga NBlumb. https//doi.org/10.1016/S0375-6742 (99)00044-8 Get rights and content.
May 01, 2019 Arsenic indicates gold deposits Similar to the natural ore system, the authors used iron-rich carbonates and sulfur-rich solutions to synthesize their fools gold crystals.
Arsenic sources to the biosphere associated with gold mining include waste soil and rocks, residual water from ore concentrations, roasting of some types of gold-containing ores to remove sulfur and sulfur oxides, and bacterially enhanced leaching. Arsenic concentrations near gold mining operations
Arsenic may be obtained from copper, gold, and lead smelter flue dust, as well as from roasting arsenopyrite, the most abundant ore mineral of arsenic. Arsenic has been recovered from orpiment and realgar in China, Peru, and the Philippines and from copper-gold ores in Chile, and arsenic was associated with gold occurrences in Canada.
The ore has been mined for arsenic and gold between 1900 and 1928, producing about 700 t As and 55 kg Au, and leaving mine dumps of several hundred m3, situated on a
proposed by Sill (13) in the late 1950s for treating arsenic sulfide ores and was used commercially for treating a cobalt-nickel arsenic ore (14). Alkaline pressure oxidation was also used to treat high-acid-consuming mercury gold ore
Abundance of gold, mercury, arsenic, and antimony in fresh limestones and unmineralized carbonate host rocks and unoxi-dized gold ores at the Carlin deposit -----8 Mean values and standard deviations for gold, mercury, arsenic, and antimony in the West, Main, and East ore bodies at the ...
The bio-oxidation of arsenic-bearing gold ore from tianli gold mine was investigated by comparing the dissolution of the sample ore in four different media, in a mix bacterial medium, mix bacterial medium after centrifugation, acidic medium and in a pure sterile medium. The experimental results showed typical oxidation characteristics for the ...
Arsenic ores are divided into several known types according to the commercial classification of ore deposits arsenic (arsenopyrite and realgar-orpiment), gold-arsenic, complex-metal-arsenic, copper-arsenic, arsenic-cobalt, and arsenictin ores. Commercial ores contain a maximum of 2 percent As, but ores with a 510 percent As content are ...
industrial jigging circuit, leading to an improvement in arsenopyrite (and gold) recovery for some of the arsenic rich ores. The main change in operating parameters was the removal of the steel shot previously being used as ragging to create the jig dense media bed.
May 01, 2010 Under these conditions, several roasting campaigns with high-arsenic-containing ores were conducted, which resulted in a significant decrease in gold recovery. The reduced gold recovery was caused by the loss of surface area (e.g., porosity) of the calcine as the arsenic content of the roaster feed increased.
Jul 15, 2021 Arsenic minerals such as arsenopyrite, cobaltite, realgar and pyrite as well as iron ore are known to contain the valuable metal. These minerals play the role of a sponge, which collects and absorbs gold in small amounts. Compared to other minerals, arsenic minerals and iron ore concentrate gold in significantly higher quantities.
Arsenopyrite is the most common mineral containing arsenic. Found in veins in crystalline rocks, associated with ores of tin, silver, lead and with various sulfides, including pyrite, chalcopyrite, sphalerite, galena, etc. Sometimes it is auriferous and serves as a
The gold ore-stage assemblage consists of gold- and arsenic-enriched pyrite and marcasite encompassed by jasperoid and drusy quartz, and local late fluorite, orpiment, and galkhaite. The consistent spatial association of jasperoid and ore pyrite reflects their near-contemporaneous formation. The ore pyrite occurs as either fine, irregularly ...
Mar 27, 2009 The extraction process of gold and silver from the gold clay ore containing arsenic and manganese was investigated. With the conventional technique, the leaching rates of gold and silver are 78.23% and 49.02%, respectively. To eliminate the negative effects of arsenic and manganese on cyanidation and increase the gold and silver leaching rates, a novel
gold in arsenopyrite and pyrite occupies iron sites in their lat-tices. In this configuration, gold with an unknown oxidation state would be coordinated by six sulfur atoms in pyrite and by three sulfur and three arsenic atoms in arsenopyrite. Tossell et al. (1981) suggested that sulfur and arsenic form pairs of at-oms, occurring as S2
arsenic-bearing ores in a broad context and related this to the specific operations at the Giant mine, Yellowknife, NWT, Can - ada, which roasted arsenopyrite (FeAsS)-rich gold ore concentrates during 50 years of operations. A large portion of the As was collected and stored in underground vaults as As 2 O 3
Most arsenic is obtained not from an ore mineral of arsenic, but as a by-product in the treatment of gold, silver, copper, and other metal ores. Environmental laws require that arsenic be removed from ores, so that it does not enter the environment in effluent gases, fluids, or solids.
Arsenic sources to the biosphere associated with gold mining include waste soil and rocks, residual water from ore concentrations, roasting of some types of gold-containing ores to remove sulfur and sulfur oxides, and bacterially-enhanced leaching. Arsenic concentrations near gold mining operations were elevated in abiotic materials and biota maximum total arsenic
Arsenic (As) and gold (Au) are closely associated in many gold deposits, both being hosted in Fe-sulfide minerals (pyrite, marcasite, and arsenopyrite), partly because As geochemistry controls Au accumulation. Yet, the partitioning behavior of As between pyrite, arsenopyrite, and hydrothermal fluids remains poorly understood.
Arsenic is an element of concern in mined gold deposits around the world Don Pedro Harvard/Jamestown Kelly/Rand (Au/Ag) Ruth Mine (Cu) Spenceville (Cu-Au-Ag) Lava Cap (Nevada) Empire Mine (Nevada) low-sulfide, qtzAu Argonaut Mine (Au) Ketza River (Au) sulfide and oxide ore bodies Goldenville, Caribou, and Montague (Au)
Jul 04, 2021 This arsenic-driven gold pump explains how these iron sulfides can massively capture and then release gold, so controlling ore deposit formation and distribution. In practical terms, it means that ...
Thus, it is increasingly necessary to process ores of lower grade to meet demand, especially on arsenic-rich gold concentrates 1, 2. In arsenic-rich gold concentrates, gold grain is always occluded by sulfide minerals such as arsenopyrite (FeAsS), pyrite (FeS 2 ), realgar (As 2 S 2 ), or orpiment (As 2 S 3 ), which severely cut off the ...
Aug 04, 2014 Arsenic trioxide has been recovered from realgar and orpiment which are found in low-temperature environments such as volcanic sublimations, low-temperature hydrothermal veins and hot springs. It has also been recovered from enargite, a copper mineral, from copper-gold ores, and has been associated with gold occurrences.
Ore was roasted to liberate gold, producing arsenic trioxide (As 2O 3) originally released to the surrounding area from the stack. Later, arsenic trioxide was captured and stored underground 237,000 tons underground Remediation plan includes in situ freezing of roaster waste 1949-1951 7400kg As/day 1958 1500 kg/day 1999 200 kg/day 20,000 ...
An ore 39 ppm gold 429 ppm silver 398 ppm copper 494 ppm of arsenic 447 of iron oxide fe 2 o 3 was mixed with 13 of sodium chloride and 65 of calcium hydroxide and heated to 1050 c in a stream of air under slightly reduced pressure the released metal chloride fumes were absorbed onto several alumina sorbent beds.