CONCENTRATION OF COPPER ORES IN NORTH AMERICA United States Department Of The Interior, Bureau Of Mines, Bulletin 392

(USGPO: Washington, DC), 1936. Paperback. Very Good. Item #21-1945

9 x 5.5", recent plain tan wraps, 169pp. Ink name of the author printed on the front cover else very good condition. Some of the contents: milling of copper sulphide ores, present method of concentrating copper ores, microscopic analysis, dewatering of concentrates and tailings. Very SCARCE.

Price: $25.00

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