Abstract
The Hutti–Maski schist belt is an important gold producing Archean greenstone belt in India. Mesothermal gold mineralization occurs within smoky quartz–sulfide veins occupying brittle–ductile shear zones. Principal ore minerals observed are arsenopyrite, pyrite, pyrrhotite, chalcopyrite, sphalerite, loellingite and gold. Although most of the gold occurs in native form, a substantial amount of gold is also present in the sulfides, especially within arsenopyrite in invisible form. Two stages of gold deposition occur in this area: (1) lattice bound invisible gold within sulfides, restricted to the shear fractures, a part of the primary gold depositional history; (2) native gold within sulfides as inclusions and as separate grains which may belong to another phase of hydrothermal fluid influx. Remobilization, reconstitution and concentration of the early phase might have formed the later phase. The substitution of Fe by Au within the sulfidic sites, adsorption–reduction and fluid rock interaction/phase immiscibility may be the plausible mechanisms for the invisible gold, microscopic substrates and visible gold respectively.
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