Monday, June 27, 2011

Mining 101: Ep 14. What are CRDs?

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Lenic Rodriguez, President and CEO of Aurcana Corp explains what CRDs are.

From infomine: Carbonate Replacement Deposits are Phanerozoic, high-temperature (more than 250 C) deposits, consisting of stratigraphically discordant Pb-Zn-Ag-Cu skarn and massive sulfide bodies associated with intrusive stocks and hosted by carbonate rocks.

Other characteristics:
In average contain about 10-15 M tones of ore, but could go up to 50 Mt;
High-grade polymetallic ores: 60-600 g/t Ag, 2-12% Pb, 2-18% Zn, trace to 2% Cu and trace to 6 g/t Au;
Types: Pb-Zn-Ag (+/- Mn); Cu-Zn (+/- Ag, Au, W); Cu-Au (+/- Ag);
The carbonate rock contact with sulfide or skarn is razor sharp;
Gangue is different for: skarn (garnets, pyroxenes, amphiboles, wollastonite, rhodonite, magnetite, serpentine); and non-skarn (calcite, fluorite, quartz, dolomite, baritone, gypsum, rhodocrosite, ankerite) deposits;
Are amenable to low-cost mining methods and have a minimum environmental footprint (limestone is an ARD inhibitor).

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