The British Columbia Geological Survey's MINFILE database lists over 3,380 occurrences for which gold is identified as the primary commodity. Of these, approximately 700 have recorded gold production (400 lode producers and 300 placer). Between 1858 and 2013, about 32 million ounces were produced from lode deposits and 6 million ounces from placers. Remaining in .
· Reserves of 37,000,000 tons at % copper, 1 g per ton gold and 16 g of per ton silver that's about 240 to 250 a ton rock. Grasberg and Ertsberg are almost in equator but because there are over 12,000 feet in elevation they receive snow from time to time as even nearby permanent glacier. How to explore for large copper deposits?