The ore, which is largely located in veins, is accompanied by a quartz-carbonate gangue with variable amounts of stibnite, and minor arsenopyrite and pyrite (FeS 2) (Němec and Zachariáš, 2018). Exploitation of Au in the Krásná Hora-Milešov deposits started during medieval times, with the Příčovy deposit exploited for a relatively …

The Black Angel deposit represents the most important base metal deposit in Greenland, having produced 11.2 million tons of Pb-Zn-Ag ore from 1973 to 1990. The deposit is hosted by a greenschist facies calcitic marble of the Mârmorilik Formation of the Paleoproterozoic Karrat Group. The ore consists of sphalerite, pyrite, and galena, with …

Idiomorphic arsenopyrite crystals frequently surround this pyrite, though they are also found inside it. ... In Salave, most of the gold is invisible one but minor amounts of free gold can be found.

minerals and phosphate minerals may be present in minor amounts. Greisen deposits consist of disseminated cassiterite and cassiterite-bearing veinlets, stockworks, lenses, pipes, and breccia (fig. 3) in gangue composed of ... chalcopyrite, bornite, arsenopyrite, enargite, stolzite, scheelite, zinnwaldite, topaz, tungstite, and native arsenic ...

The arsenopyrite, loellingite and pyrrhotite samples contain minor amounts of silicates that are inert in Ethaline. The α-sulfur sample was from Sigma Aldrich (99.9%). The mineral electrodes were made by two …

Minor amounts of galena (PbS), sphalerite (ZnS) and quartz (SiO 2) were detected in the ground arsenopyrite sample. After impurities removal, only the phase FeAsS (ICDD 42–1320) was detected in the sample, which means a content of impurities lower than about 3% wt., based on the detection limit of the diffractometer used in this …

Ore minerals in the Patricia ore deposit consist, in decreasing order of abundance, of: pyrite, sphalerite, galena and arsenopyrite, minor amounts of chalcopyrite, pyrrhotite and Ag-bearing ...

The Gutaishan deposit is a slate-hosted lode Au–Sb deposit in the Xiangzhong Sb–Au metallogenic province, South China. The deposit has a proven reserve of ca. 9 -t gold at an average grade of 13-g/t and contains 2500-t Sb. The deposit represents the product of a complex ore-forming process, comprising four different stages, of which …

Request PDF | Arsenopyrite oxidation – A review | Arsenopyrite (FeAsS) is the most common As-bearing sulfide mineral. ... such an oxidized overlayer consists of scorodite and minor amounts of ...

The arsenopyrite is commonly coarse-grained (typically 1 mm) and enclosed in quartz or impregnating schist breccia fragments within and adjacent to the quartz veins. The arsenopyrite is generally intimately intergrown with pyrite, and minor amounts of other sulphides: sphalerite, galena, chalcopyrite, and stibnite.

Primary sulfide minerals are dominated by pyrite (70 vol%) and arsenopyrite (25 vol%), with minor to trace amounts of stibnite, chalcopyrite, marcasite, and galena. Gold mainly occurs as invisible gold within pyrite and arsenopyrite. Quartz, calcite, sericite, and minor amounts of illite are the gangue minerals here.

General Arsenopyrite Information : Chemical Formula: FeAsS : Composition: Molecular Weight = 162.83 gm Iron 34.30 % Fe Arsenic 46.01 % As Sulfur 19.69 % S _____ 100.00 …

However, application of the arsenopyrite geothermometer has not been straightforward because of the widespread presence of other minor and trace elements in arsenopyrite and because in many ...

Arsenopyrite (FeAsS), orpiment (As 2 S 3), and realgar ... Arsenopyrite is the major source of arsenic, contains minor gold, and used as herbicide, alloys, wood preservatives, medicine, insecticide, and rat poison. ... Mine tailings can contain substantial amounts of arsenic, and the weathering of these deposits can liberate arsenic into the ...

the most frequent, although present in minor amounts (they are usually only accessory: arsenopyrite, pyrrhotite, lepidocrocite, etc.), or those of major economic importance, even if scarce (Au, Pt, other precious metal species, REE ‹Rare-earth element› minerals such as monazite, etc.) or

Measured invisible Au concentrations in arsenopyrite generally exceed those in pyrite by one or two orders of magnitude (Tables A2 and A3), which is consistent with the empirical evidence for incorporation of greater amounts of chemically bound Au in arsenopyrite than pyrite formed under identical conditions (Reich et al., 2005).

Metal extraction releases significant amounts of arsenopyrite (FeAsS) and other sulfide minerals (SM) containing potentially toxic elements (PTEs) including arsenic, lead, chromium, and cadmium into soils, surface and groundwater sources, and aquatic sediment. ... As observed, minor topographic modifications are identified on the …

The elemental composition of the arsenopyrite was 44.91% As, 33.30% Fe, 18.54% S, with minor amounts of Si (1.02%), Al (0.59%), Cu (0.47%), and Ca (0.28%). …

The sulfide layers are predominantly composed of pyrite and pyrrhotite, associated with minor amounts of chalcopyrite, magnetite and arsenopyrite (Figure …

The ore texture is typically finely banded to massive sulphide. The mineralogy includes pyrite, pyrrhotite, sphalerite and chalcopyrite. These are commonly intergrown with minor amounts of galena, stannite and arsenopyrite (Ellis, 2003). The pyrrhotite appears to be dominant over pyrite, unlike the Teutonic Bore deposit.

The XRD patterns obtained showed that the sample consisted of arsenopyrite as the main phase and a minor amount of quartz (approx. 5%). BSE image of the raw sample by Cameca SX-50 electron microprobe showed that arsenopyrite (AsFeS) was the dominant phase with minor amounts of quartz (SiO 2) (<3%), pyrite (FeS 2) …

At the end of the arsenopyrite-only control experiment, the amounts of As(III) and As(V) accounted for approximately 67% and 33% of the total dissolved As, ... (1:1) in the formula of arsenopyrite (FeAsS), although a minor deviation existed probably due to the underestimated sulfur species from the incomplete oxidation of sulfur …

Minor amounts of Au (0.027 ± 0.020 and 0.027 ± 0.020 wt%, respectively), Cu, Ni, and Co are detected in both Apy 2 and Apy 3 (Table 3). Fig. 13 Contents and correlations of As, S, Au, and Sb in different stages of arsenopyrite of the Yangshan gold belt, showing that the Apy 3 has higher contents of S and Sb and lower contents of As …

The dry weight of the pyrite & arsenopyrite residue was reduced by 95.1% after bioleaching, compared to the initial load, while only 5% weight loss was observed …

arsenopyrite occurs intergrown with rammelsbergite – niccolite – gersdorffite – löllingite – native bismuth – bismuthinite – ... At the beginning of substage IIb, minor amounts of niccolite, rammelsbergite, löllingite, gersdorffite, ar-senopyrite, and native bismuth were deposited with cal-cite and minor quartz. The Fe–As(–Ni ...

The arsenic As and sulfur S in the As-S dianions may be partly replaced by minor amounts of antimony Sb, Selenium Se, and/or tellurium Te. The chemical composition of arsenopyrite may differ in detail from one deposit to another, from one deposition stage to another in a given deposit, and even from the outer parts of a single grain towards its ...

Arsenic has a restricted solubility in pyrite but is commonly present as a minor element at ppm to low wt.% levels. For example, based on experiments at 600 °C the maximum amount of As present in pyrite in equilibrium with arsenopyrite is 0.1 wt.% (Clark, 1960).However, as discussed by Cook and Chryssoulis (1990) and Griffin et al. (1991), …

The bulk sample (<2 mm) was mainly composed of pyrite with minor amounts of other minerals like arsenopyrite (FeAsS), pyrophyllite (Al 2 Si 4 O 10 (OH) 2), muscovite (KAl 2 (AlSi 3 O 10)(F,OH) 2), melanterite (FeSO 4 ·7H 2 O) and quartz (SiO 2) (Fig. 1 a). These identified minerals were consistent with the chemical composition of the …

The Pulai gold deposit is one of the most promising gold prospects in the Central Belt of Peninsular Malaysia. It is found within the Permian-Triassic Gua Musang sequence of metasediments and metavolcanics and in a structurally controlled NE-SW major fault. Various ore minerals, including pyrite, arsenopyrite, chalcopyrite, sphalerite, …

The Xihuashan tungsten deposit, Jiangxi province, China, is a world-class vein-type ore deposit hosted in Cambrian strata and Mesozoic granitic intrusions. There are two major sets of subparallel ore-bearing quartz veins. The ore mineral assemblage includes wolframite and molybdenite, with minor amounts of arsenopyrite, …