100m W x 70m L x (20m D x 0.25 safety factor) = 35,000 m
335,000 * 1.8 t per m3 = 63,000t
63,000t * 3.5g/t = 220,000 grams -> 7,800 oz?
Ann: Red River identifies gold potential in Hillgrove waste dump, page-2
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