Applications of statistical analysis to determine cut-off grade of Turamdih West (Northern ridge) uranium deposit Singhbhum district, Bihar, India

The subsurface borehole data pertaining to Turamdih West (Northern Ridge) uranium deposit, Singhbum district, Bihar has been statistically analysed to determine the cut-off grade by taking into account the excessive width of mineralised portion intercepted by series of boreholes. The uranium mineralisation, by and large, is bimodal, positively skewed and shows log-normal distribution. The variance of tenor in different transverse sections and continuity of mineralisation has been studied at various possible combinations of cut-off grade and thickness. It revealed a well correlatable persistent ore body at 0.020% e U3O8 cut-off grade and thickness, which is further confirmed by computing percent of absolute oxide content, percent of volume (V%) and percent of oxide recovery versus average grade of ore body. (author)