Geological characteristics and metallogenic laws of Shanxi Jinshan Bauxite Deposit

Bauxite ore bodies in Shanxi are usually found in the Middle Carboniferous Benxi Formation, showing a discontinuous distribution. Through the drilling project, it is revealed that there is a bauxite ore body in the pre-survey area, but there are differences in the thickness of the bauxite ore body, and no ore body is found in some drill holes. In order to understand the ore body distribution characteristics, mineralization source and metallogenic environment of bauxite in a pre-survey area. In this study, the ore body distribution, ore characteristics, and mineral-forming sources in the area are discussed and studied by using the borehole data, sample analysis and laboratory results, combined with the geological background and stratigraphic characteristics of the area. The bauxite ore body in the study area is distributed in layers, but the ore-bearing rocks are affected by the Ordovician paleokarst landform, and there are certain changes in the spatial distribution. The Al₂O₃ content of the ore in the area is 57.23%. The main body of the mineral is diaspore monohydrate. It is manifested as irregular debris, clots, etc. The natural types can be divided into dense bauxite, coarse bauxite, clastic bauxite, and oolitic bauxite. The bauxite ores in this area are mainly derived from basal Ordovician carbonate rocks, and their genesis can be classified as carbonate paleoweathering crust calcite-lateritic deposits.