"Two sets of concentrate samples were sent to the lab, and the initial assay results show the samples of concentrate contained an average of 520 grams per tonne gold, for an effective yield of 0.26 grams of gold per yard of in-place background placer"
It sounds like they have to dig up and process a lot to get one tonne of "concentrate". 520 / .26 = 2000 yards??
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