China
Africa
Explore chapters and articles related to this topic
Mafic-ultramafic hosted massive sulphide deposits in Southern Urals (Russia)
Published in Adam Piestrzyński, Mineral Deposits at the Beginning of the 21st Century, 2001
S.G. Tessalina, V.V. Zaykov, J.-J. Orgeval, T. Augé, P. Omenetto
Ore facies comprise massive and disseminated pyrite-chalcopyrite-pyrrhotite and chalcopyrite-pyrrhotite aggregates. Interesting are pegmatoid aggregates of coarse lamellar pyrrhotite with interstitial glassy quartz. Massive pyrrhotite ore contains inclusions of chromite, cobaltite, Co-pyrite and flame-like pentlandite, as well as traces of native gold, native bismuth and a Bi-telluride (pilsenite). Disseminated ore has different mineralogy: coarse (1-3 mm) tetragonal crystals of sphalerite with rounded chalcopyrite inclusions predate the deposition of pyrrhotite, Co-pentlandite (locally with secondary Co-violarite), Ni-glaucodot with abundant gold and native bismuth inclusions, and the commonly observable chalcopyrite-cubanite pair.
Controls on cobalt and nickel distribution in hydrothermal sulphide deposits in Bergslagen, Sweden - constraints from solubility modelling
Published in GFF, 2020
Many marble- and skarn-hosted Cu sulphide deposits in the Bergslagen mining district in Sweden contain minor or accessory minerals of Co and locally of Ni. Classic examples include the Håkansboda and Tunaberg deposits (Tegengren 1924), both of which occur in dolomitic marble carrying abundant magnesian calc-silicates, magnetite and calcite near mineralization. These deposits are mineralogically complex and contain numerous Co and Ni minerals including cobaltite (CoAsS), glaucodot ((Co,Fe)AsS), ullmanite-willyamite (NiSbS-CoSbS), safflorite ((Co,Fe)As2), costibite (CoSbS), cobaltpentlandite (Co9S8), nickeline (NiAs), breithauptite (NiSb), kallilite (Ni(Sb,Bi)S), nisbite (NiSb2), kieftite (CoSb3) and oenite (CoSbAs) (Carlon & Bleeker 1988; Dobbe 1992, 1994; Dobbe et al. 1994; Dobbe & Zakrzewski 1998).