Grade Distribution and Orebody Demarcation of Bauxite Seam Based on Coupled Interpolation

Abstract

A three-dimensional coupled interpolation method with three steps was proposed to establish a smooth and precise grade distribution model of bauxite seam. Compared with and supported by the field grade data measured by some exploratory boreholes, the stability of interpolation model established by natural neighbor method is the best to depict a thin bedded deposit to be more physically realistic in data interpolation. Based on this model, the total volume of bauxite seam in the 1102 longwall mining panel is \(189{,}270 \, \hbox {m}^{3}\), in which the average values of mass fraction of \(\hbox {Al}_{2} \hbox {O}_{3}\) and mass ratio of \(\hbox {Al}_{2} \hbox {O}_{3}\) to \(\hbox {SiO}_{2}\) are 55.09% and 17.72, respectively. Demarcated by industrial standards, the volume, the average mass fraction of \(\hbox {Al}_{2} \hbox {O}_{3}\) and the average mass ratio of \(\hbox {Al}_{2} \hbox {O}_{3}\) to \(\hbox {SiO}_{2}\) of bauxite orebody are \(96,654 \, \hbox {m}^{3}\), 61.58% and 27.10, respectively. These mean that the bauxite orebody has abundant high-grade ore.