Economic evaluation of borehole and conventional mining systems in phosphate deposits.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 8929, 1983 Jan; :1-34
The Bureau of Mines compared the feasibility of mining deep phosphate deposits by a borehole mining system with mining by proven conventional techniques. An economic comparison of the borehole mining system with conventional dragline and bucket wheel excavator mining systems was completed at various mining depths and production rates. Hypothetical phosphate deposits, with various overburden thicknesses and reserve tonnages, were defined. Geologic conditions necessary for the application of the borehole system were identified. Borehole mining was found to be more economical where overburden thickness was 150 ft or greater; however, at 50- and 100- ft thicknesses, conventional surface mining was more economical. Overburden thickness has a great effect on the economic feasibility of the conventional mining systems but less effect on the economics of borehole mining.
Mining-industry; Phosphate-deposits; Boreholes; Surface-mining; Mining-equipment; Beneficiation; Capitalized-costs; Operating-costs; Cash-flow
IH; Information Circular
NTIS Accession No.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 8929