Occurrence and distribution of invisible gold in a Carlin ...
ground to - 100 mesh; then a portion was further ground to -200 mesh for Au assay and chemical analyses of S, Fe, Al, and K. Most of the sample of -100 mesh was used to prepare two pyrite concentrates (one >0.074 mm, the other <0.074 mm) by sieving and panning, then re-moving impurities such as barite by use of a dielectric
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