By John Drew Ridge
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Extra info for Annotated Bibliographies of Mineral Deposits in Africa, Asia (exclusive of the USSR) and Australasia
The coarser the arsenopyrite, the less likely gold is to be present. Stibnite is quite prominent above the 3000-foot level but dies out rapidly below that level; it ranges from fine disseminations and aggregates in the quartz to coarser massive material in the lavas. Practically all specimens of native gold contain traces of stibnite; the stibnite is later than the arseno pyrite, and, wherever stibnite is present, gold content is higher than without it. Some sphalerite and a little galena are present in veins on the lower levels; these sulfides are not found in the lavas or sediments.
In addition to the granites, the Lomagundi rocks also were intruded by a variety of mafic rocks that are now epidiorites and metadolerites; these rocks were emplaced before the latest granites. The central granite of the Mangula district is of this late granite type and has been found to be in trusive into the Lomagundi rocks; phases of this granite, however, are older than these sediments. The deformation in the district was intense and commonly produced complicated isoclinal folds, plus some thrust faults.
Bd. 53, H. 2, S. 870-895 Pelletier, R. , 1 9 6 4 , Copper [in Rhodesia], in Mineral resources of SouthCentral Africa: Oxford Univ. Press, Cape Town, p. 161-163 Stagman, J. , 1 9 5 9 , The geology of the country around the Mangula mine, Lomagundi and Urungwe districts: S. Rhodesia Geol. Surv. Bull. no. 46, 84 p. Notes The Mangula mine is about 87 miles north-northwest of Salisbury (17°43'S, 31°05'E) and some 37 miles north of Sinoia (17°21'S, 30°13'E); Sinoia, in turn, is about 62 miles northwest of Salisbury.
Annotated Bibliographies of Mineral Deposits in Africa, Asia (exclusive of the USSR) and Australasia by John Drew Ridge