northwest LOW-SULPHIDATION EPITHERMAL QUARTZ-ADULARIA GOLD SILVER VEINS & EL FUEGO
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australian electronic gold prospecting forum.com  |  Geology and occurrence of gold deposits  |  Gold deposits  |  Gold deposits of the world  |  Topic: LOW-SULPHIDATION EPITHERMAL QUARTZ-ADULARIA GOLD SILVER VEINS & EL FUEGO 0 Members and 1 Guest are viewing this topic. « previous next »
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« on: Friday July 13 2012 11:20:25 AEST AM »

 LOW-SULPHIDATION EPITHERMAL QUARTZ-ADULARIA GOLD SILVER VEINS & THE EL FUEGO PROJECT, MEXICO
By Morgan Poliquin, M.Sc., P.Eng.
Geological Engineer and Director
Almaden Minerals Ltd.
INTRODUCTION TO LOW-SULPHIDATION EPITHERMAL VEINS
Much of the world’s gold has been produced from quartz veins. Veins are formed when quartz or other minerals precipitate from a cooling fluid in a planar zone of weakness known as a fault. Quartz can precipitate from several different types of fluids, one of which is responsible for low sulphidation epithermal gold-silver veins and geothermal systems such as the hot springs at Yellowstone or the Geysers in California. The fluids are typically a mixture of groundwater and fluid emanating from molten rock at depths of around 5 to 10 kilometers below surface. These hot fluids are under very high pressures at those depths, and as they rise along faults to depths of about two kilometers from the surface, they begin to boil. As the fluids boil, they cool rapidly, causing the quartz to precipitate in the fault, forming the vein. Calcite and adularia (a feldspar mineral) also precipitate in response to boiling as well as any gold and silver present in the fluid. Eventually the rising fluids breach the surface and form a hot spring
  
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