Canadian mining journal July-December 1915 . of the Porcu-pine Gold Deposits, Bull. Can. Min. In^t.,March, 1912. 1913—Gold Deposits of Porcu-pine District, Ontario, Econ. Geol., Vol 8,No. 5, Aug., 1913. Knight, Cyril W.—1911—Mineral Associates atPorcupine, Min. & Sci. Press, Vol. 102, p. 530. Linsley, Thayer—1911—The Ore Deposits of Por-cupine, Eng. & Min. Jour., Vol. 91, p. 1005. Loring, W. J.—The Porcupine Gold Field, Min-ing Magazine, Vol. 4, No. 4, p. 284. Miller, Willet G.—1910—The Porcupine Districtof Ontario. MacLean, T. A.—1912—Notes on the PorcupineGold Region, Ontario, Min. Soc. Nova
Canadian mining journal July-December 1915 . of the Porcu-pine Gold Deposits, Bull. Can. Min. In^t.,March, 1912. 1913—Gold Deposits of Porcu-pine District, Ontario, Econ. Geol., Vol 8,No. 5, Aug., 1913. Knight, Cyril W.—1911—Mineral Associates atPorcupine, Min. & Sci. Press, Vol. 102, p. 530. Linsley, Thayer—1911—The Ore Deposits of Por-cupine, Eng. & Min. Jour., Vol. 91, p. 1005. Loring, W. J.—The Porcupine Gold Field, Min-ing Magazine, Vol. 4, No. 4, p. 284. Miller, Willet G.—1910—The Porcupine Districtof Ontario. MacLean, T. A.—1912—Notes on the PorcupineGold Region, Ontario, Min. Soc. Nova ScotiaJour., Vol. 17, p. 82. McDonald, P. B.—The Porcupine Gold District,Ontario, Mining Science, Vol. 63, p. 231. Meyer, Ralph A.—The Porcupine Gold & Sci. Press, Vol. 102, p. 756. Stansfield, John—Microscopic Examination ofSome Typical Sections of Porcupine Rocks andVein Matter. Can. Min. Jour., Vol. 32, p. 109. Shaw, S. F.—Some Notes on Porcupine. Min. Jour., Vol. 92, p. Gold Quartz, Millcrton Mine. Porcupine. October 1, 1915 597 THE DETERMINATION OF COBALT AND NICKEL IN COBALT METAL By C. A. Knittelf The only methods for the analysis of CobaltMetal which the writer has been able to find inthe literature, are given by C. M. Johnson in hisbook, Chemical Analysis of Special Steels, Steel-making Alloys and Craphites. Considerable diff-erences between Steel Works Chemists and theConiagas Reduction Co. laboratory seem to showthe desirability of further information on thissubject. The following method has been employedin this laboratory for some time, duplicates check-ing within : One gram of drillings contained in a 150 flask provided with a trap* (made of acalcium chloride tube) is treated with 20 ofHydrochloric Acid (S. G. ). A gentle heat isapplied until all action ceases. 1 pf nitricacid (S. G. ) is now added to dissolve any re-maining metallic residue. As soon as the action ofthe nitric aci
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