arsenopyrite

Gold mineralization is contained within a locally brecciated, moderately to strongly silicified zone with abundant crosscutting gray, vuggy quartz stringers with 1-3% disseminated pyrite, arsenopyrite and minor stibnite (antimony).

Reanalysis suggests this hole may have ended in a potential feeder zone for the Bottle Creek resource mineralisation, with up to 10% disseminated sulphides including pyrite, arsenopyrite, sphalerite, galena and chalcopyrite, abundant quartz stockwork and intense structural deformation.

'Geologically, Pengkalan Hulu is located within the tin mineralisation belt, where arsenopyrite is found.

The arsenopyrite, chalcopyrite and pyrite also occur in Dainyor and Jotiyal nalas in Gilgit.

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.

Moreover, solubility products of arsenic-bearing minerals such as arsenopyrite were included in this thermodynamic database.

A 300-kilogram sample of arsenopyrite concentrate will be taken from the flotation plants in Ponce Enriquez and shipped to Laurentian University for five to six months of bioleach test work.

Recently, bioleaching has been used for the pre-treatment of minerals, for example, for dissolving sulfides from pyrite or arsenopyrite, which contain gold and silver in their matrices [7, 8].

It was identified by JCP.CAT search & match programmes of the X-ray Diffractometer that the minor peaks correspond to, marcasite (Fe[S.sub.2]), arsenopyrite (FeAsS), chalcopyrite (CuFe[S.sub.2]), cinnabar (HgS), barite (BaS[O.sub.4]), calcite (CaC[O.sub.3]), dolmite [CaMg [(C[O.sub.3]).sub.2]] and clay minerals.

Pyrite and arsenopyrite are the main associated sulphide minerals and commonly form a broad mineralized halo.