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Abstract

The Ingerbelle and Copper Mountain deposits are located 15 km south of Princeton in southern British Columbia. The property is owned by Newmont Mining Corporation's wholly owned subsidiary, Similkameen Mining Company Ltd., and includes the Copper Mountain mine, where production ceased in 1957. Mining of the Ingerbelle deposit commenced in 1972 at a rate of 13,600 tonnes per day. Ore reserves as of January 1, 1975 were 55,749,000 tonnes grading 0.53 per cent copper at the Ingerbelle and Copper Mountain Pit 1 and Pit 2 orebodies.

All of the known copper deposits in this camp lie in a 1,100 by b,300-m belt of Upper Triassic Nicola volcanic rocks that is bounded to the south by the concentrically differentiated Copper Mountain stock and to the north by the Lost Horse intrusive complex.

Rock alteration in the camp involves widespread development of biotite followed by albite and epidote, with subsequent local potash feldspar and/or scapolite metasomatism. This alteration affects both the volcanic rocks and the intrusive rocks of the Lost Horse suite.

The orebodies are essentially disseminated sulphide deposits, although fracture fillings are also important in many areas. Total sulphide content is generally less than 5 per cent. In the Ingerbelle, Pit 2 and most of the Pit 1 orebodies, the sulphides are chalcopyrite and pyrite; in part of Pit 1 and in most of the former underground mine they are chalcopyrite and bornite.

The Copper Mountain deposits have been classified by some workers as complex porphyry deposits of the syenite clan, and the Ingerbelle as a skarn deposit gradational to a porphyry. Other workers have placed more emphasis on the characteristics that these deposits have in common with the pyrometasomatic class.

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