Transactions . Fig. 5.—Vein at Depth of 60 Chalcopyrite Surroundedby Secondary Sulphide, Covellite,and an Outer Rim of Oxides ; Evi-dently the Beginning of Second-ary Sulphide Zone. X Fig. 2.—Vein Composition at Depthof 20 Ft. Remnants of PrimaryChalcopyrite Surrounded b\t Sec-ondary Hematite. X 35.

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries