The Geology of the N'Changa District, Northern Rhodesia

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Abstract
I. I ntroduction T his paper presents a brief account of the general geology and petrology of a previously unmapped portion of the Northern Rhodesian copper belt, and covers approximately 800 square miles of territory. The map-area forms a portion of the Rhodesian Congo Border Concession now being explored by the Rhokana Corporation, Ltd. The area is bounded on the south by the 13th parallel of south latitude, on the east by the boundary between the Rhodesian Congo Border and the N'Kana Concessions, and on the west by the Lufwanyama River. Its northern boundary lies approximately 6 miles north of the Kafue River near N'Changa, and 8 miles south of the Belgian Congo border. The district is in the heart of the Northern Rhodesian copper belt, and includes the N'Changa Copper Mines Ltd. Concession and its extensions; it lies in close proximity to the other principal copper deposits of Northern Rhodesia and the Katanga. Within the last few years, Northern Rhodesia has attracted wide interest by virtue of its recently discovered copper deposits, which in tonnage and tenor of ore now rank amongst the foremost of the world. Lying within this region, the N'Changa district, in respect of both geology and mineralization, is typical of the Northern Rhodesian copper belt, and contains, perhaps, a wider range of rock types and a greater abundance of natural exposures than is usual in neighbouring districts. Consequently, the results of the studies described in this paper may assist in the elucidation of the broader problems of