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vi234n ug mama extract gold pulverizer ore china 9324

Local geological factors more frequently influence the concentrations of trace metals. Hall, Magee, and Varga 2527 have reported that certain elements tend to be concentrated near the edges of a coal seam Ge, Be, Ga, B other elements may be enriched if the seam is close to an ore deposit Mo, Sn, Pb, Hg, CI being typical ex amples .

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