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Geology Corner: The nuts and bolts of feasibility studies on gold Great Bear Resources employees study a drill map. Credit: Great Bear Resources. Of the 123 global gold projects with completed feasibility studies or ones being worked on, 50 projects are orogenic deposits; 24 are epithermal deposit types, and eight are porphyry deposits, according to Glacier Resource Innovation Group’s Mining Intelligence database. The other deposit types are volcanogenic massive sulphide (VMS) deposit projects at 16; iron oxide copper gold at six; skarn at four; and intrusion-related deposits at one. “The orogenic and epithermal deposits make up about 59% of the defined gold in the ground at the feasibility stage, and 41% are orogenic deposit types,” says Katja Freitag, the manager of Mining Intelligence, a research and database owned by Glacier Resource Innovation Group. “Epithermal deposits generally have double the amount of gold in them than orogenic deposits and while porphyries are

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