Accumulated bauxite deposits were first discovered in North China

Recently, relying on geological survey and evaluation work project "geological survey and availability of low-grade bauxite in the Dengfeng-Xinmi area of ​​Henan Province", the Zhengzhou Comprehensive Institute project team under the guidance of experts from the Tianjin Geological Survey Center successively took part in Henan Province. The deposits in the areas of the state, Ganxian, Baofeng and Lushan counties have a certain amount of geological reserves and a wide range of prospective deposits of bauxite. However, this type of bauxite was discovered for the first time in North China and further exploration work is underway.

The newly discovered deposit type bauxite ore-bearing layer is a set of Quaternary loose deposits of brownish red, gray-purple bauxite-bearing gravel and detritus, mainly composed of clay-clay bauxite and a small amount of limonite. It consists of crumbs and clay rocks, with varying sizes of bauxite ores, ranging from 0.5 cm to 20 cm, with a concentration of between 2 cm and 10 cm. The roundness and sortability of gravel are good. The thickness of the ore bed is between 0.2m and 5m. The top plate of the ore body is topsoil or overburden. It is mainly composed of yellow-brown humus and clay. The texture is loose and the cementation is poor. The boundaries are clearer. The topsoil or overlying layers are of different thicknesses. Some of the ore bodies are directly exposed to the ground surface, and some have thicker coverage. The direct bottom plate of the ore body is limestone or clay rock.

The newly discovered deposits of bauxite are broadly divided into two categories: The first type occurs in the karst funnels in the bedrock area, and the occurrence is closely related to the karst funnels. The thicker karst funnels deposit thicker bauxite, generally Between 0.5m and 5m; the second type is produced in the Quaternary laterite (loess) layer, which has a near-horizontal level of thickness ranging from 0.2m to 3m.

This type of bauxite has a high grade, and the ratio of aluminum to silicon can reach more than 7 and it has the characteristics of easy selection and easy mining. The recovery of stacked bauxite deposits in farmland can also be used to improve soil efficacy.

The discovery of accumulated bauxite deposits in Henan breaks through the predecessors' belief that China has only accumulation-type bauxite deposits in South China and is of great significance for the search for accumulating bauxite deposits in North China.