OFR 117-81 - Application of a Hydraulic Borehole Mining Apparatus to the Remote Extraction of Coal. 1981.

The results of a program to demonstrate the technical feasibility of hydraulic borehole coal mining are presented in this report. The hydraulic borehole method of coal mining involves inserting a hydraulic mining device into a borehole that has been drilled from the surface into the underground coal bed. The borehole mining device issues a jet of water under high pressure, which breaks the coal. These pieces of coal, along with the water, form a slurry, which flows to the base of the borehole where it is pumped to the surface. Phase I of the program encompassed the design, fabrication and factory -testing of a hydraulic borehole mining device. The program was successfully completed with the field tests being conducted...

Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Coal, Pierce County, Washington