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Experimental simulation of oxidative leaching of Co-Ni tailings
Published in Gülhan Özbayoğlu, Çetin Hoşten, M. Ümit Atalay, Cahit Hiçyılmaz, A. İhsan Arol, Mineral Processing on the Verge of the 21st Century, 2017
E.P. Bortnikova, O.L. Gaskova, S.B. Bortnikova, D.J. Bessonov
Primary mineralization of the Khovu-Aksy ore deposit is represented by carbonate veins situated in to the skarned Silurian rocks (Yakhontova et al, 1978; Borisenko et al., 1984). Before mineralization carbonate metasomatism occurred. Arsenide minerals present in the following forms: massive filling of the cracks in the veins; filling of impregnations in the dolomite, calcite, ankerite; as brecciated and rhythmic aggregates. The most abundant minerals are the safflorite, smaltite-chloanthite, skutterudite, rammelsbergite, nikeline and loellingite, belonging to the main paragenic series – smaltite-safflorite and smaltite-nikeline-rammelsbergite (Table 1). Sulfide-tetrahedrite stage differs distinctly from previous stages in mineralogical composition. The main minerals are tennantite, chalcopyrite, bornite, pyrite. Minor minerals are galena, sphalerite, argentite, native silver and bismuth.
The origin of Złoty Stok An-As deposit, Poland: preliminary organic geochemical and isotopic studies
Published in Adam Piestrzyński, Mineral Deposits at the Beginning of the 21st Century, 2001
The loellingite is accompanied by varied amounts of pyrrhotite, arsenopyrite, magnetite and pyrite dominating the ore mineral association. Other ore minerals, such as chalcopyrite, galena, sphalerite, hematite, glaucopyrite, and glaucodote were reported in smaller quantities. Arsenopyrite is generally younger than loellingite, which together with commonly oriented intergrowths of chalcopyrite in pyrrhotite, suggests high (>400°C) temperatures of metasomatic processes during the formation of the pyrrhotite-associated minerals. The sulphide stage of ore mineralization was preceded by crystallisation of skarn-like mineral assemblages represented by pyroxene, garnet and scheelite. Fluid inclusion studies of these minerals demonstrate that the earliest stage with oxides had low salinity fluids (4.9-5.2 wt. % NaCl equiv.), homogenisation temperatures between 464-480 °C, and pressure above 1.4 kb (Mikulski 1996).
The Fate of the Arsenic Species in the Pressure Oxidation of Refractory Gold Ores: Practical and Modelling Aspects
Published in Mineral Processing and Extractive Metallurgy Review, 2023
Wei Sung Ng, Yanhua Liu, Qiankun Wang, Miao Chen
Compared to arsenopyrite and arsenian pyrite, the formation of löllingite (sometimes referred to as loellingite) requires an abundance of arsenic relative to sulfur during hydrothermal formation, resulting in complete substitution of the sulfur groups with arsenic. Although löllingite is less abundant than its sulfide analogues, the arsenide has been observed to contain upward of 50 g/t of gold (Laukkanen and Leppinen 1994). It is often associated with arsenopyrite, and less commonly with pyrite or arsenian pyrite (Reich and Becker 2006; Xing et al. 2019).