Abstract:

Grade-tonnage model is one of the three essential parts for mineral resource assessment. The authors establish the gradetonnage models for all the types of bauxite deposits in China through a series of statistical tests, including histogram analysis and normal and lognormal distribution tests on the data of 255 bauxite deposits from the Reserve Database of Mineral Resources in China (1999). The research manifests that all the bauxite deposit types are lognormal distributive. The Monte Carol simulation results show that under the 90 percent probability of bauxite resources in China, accumulative bauxite deposit of AlO(OH)₃ and sedimentary bauxite deposit of

AlO(OH)₃ resources are accounted for 198.78 percent and 155.29 percent of the discovered bauxite resources respectively. The bauxite resources have great potential in China, and both accumulative and sedimentary bauxite deposits of AlO(OH)₃ are major future prospecting types and exploration efforts.

Key words: grade-tonnage model, bauxite deposit, Mentor Carol method, China