Post by
Retiredgeo on Oct 10, 2024 8:30am
Silver and CRD
CRD is short for carbonate replacement deposit. They are created when mineral-rich fluids coming off a porphyry magma eat into limestone or marble and replace it with sulphides. The silver in the volcanic Jurassic cover rock has nothing to do with CRD. These are epithermal veins probably formed during the reheating of the Leviathan porphyry during it's accretion to the North American continent.
There may be genuine CRD deposits in the drill area but they have yet to drill any of them. By definition they would not be in the younger Jurassic cover rocks.