Abstract:The Shilu copper Mine, up to now, has been the only mine in Chian operated exclusively for secondary copper minerats. It differs from the common oxidized enrichment zone of sulfide deposits in that it has been formed in a special geological environment and shows a unique style. The whole orebody occurs in loose Quarterary sediments of slope-eluvial-alluvial-diluvial depression accumulation facies. The geological environment for formation of this deposit is quite similar to that of placer. These sediments are composed of heterogeneous materials consisting of clay, gravel and sand. The foot wall of the orebody is governed in shape by the paleogeomorphology of karst in the erosional depression. This secondary copper deposit has malachite as almost the only economic mineral and is 5 times bigger than the primary orebody in size. The hanging wall or the rich orebody coincides basically with the present groundwater table in limestone. In other word, the orebodies are wholly located in the stagnation zone of gI’oundwater or beneatk the boundary surface of the oxidation zone. This kind of enrichment in oxidized copper minerals is rarely seen. Copper of this secondary deposit is derived from the primary copper deposit and the extensively developed copper-bearing skarn zone, both of which occur around the boundary surface of the catchment depression. In addition, this area is situated in subtropical zone characterized by the natural condition of humid, hot and much rainfall climate which is extremely favorable for the reformation of the primany copper sulfide deposit, It is therefore conceivable that this secondary copper deposit has been formed as a result of the erosion, denudation, dissolution, transportation and reconeentration of the copper sulfide minerals. An analysis of large quantities of data available le indicates that this secondary copper deposit is genetically of leaching-sedimentary type, i. e., a mixed sedimentary type dominated by chemical sedimentation accompanied by leaching mineralization.
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杨世礼.1985.广东石菉铜矿东段次生矿的地质特征[J].矿床地质,4(2):31~40.1985.Geological characteristics of the secondary copper deposit in eastern part of the Shilu copper mine in Guangdong province[J].Mineral Deposits4(2):31~40
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