CONTROLS ON THE FORMATION OF DISSEMINATED- AND VEIN-STYLE LOW-SULFIDATION EPITHERMAL PRECIOUS METAL DEPOSITS
Low-sulfidation epithermal deposits are major sources of Au and Ag. They form in the shallowsubsurface (<1.5 km) from near-neutral chloride waters at <300°C. The ore-forming waters are rock- buffered and have a low salinity (<3‒4 wt.% NaCl equiv.). Many low-sulfidation epithermal deposits are characterized by bonanza-type ore zones confined to banded quartz veins and breccia zones and are mined as high-grade, small-tonnage deposits. However, the ore zones in some of these deposits consist of disseminated hypogene sulfides and may be extracted by low-grade, large-tonnage operations. Research at ...
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