Arsenic is dispersed widely in nature and is the 47th most abundant element among the 88 known natural elements. The average crustal abundance is 1.5 ppm, with higher concentrations in reduced shales and coals. It is concentrated in many metal-bearing mineral deposits being a chalcophile element. It occurs in many metallic deposits including those of Cu, Ag, Au, Zn, Hg, U, Sn, Pb, Mo, W, Ni, Co and PGE. Arsenic is often more dispersed than ore minerals in those deposits and as such is a useful indicator in geochemical exploration (Boyle and Jonasson 1973; Hale 1981;...

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