Mining or in situ disintegration of hard material – Processes – Explosive
Patent
1978-04-19
1980-10-07
Pate, III, William F.
Mining or in situ disintegration of hard material
Processes
Explosive
166222, 166 77, 134 17, 299 17, 299 20, 239562, 239591, E21C 2560, E21C 500
Patent
active
042264758
ABSTRACT:
A method for extracting an underground mineral such as coal, which avoids the need for sending personnel underground and which enables the mining of steeply pitched seams of the mineral. The method includes the use of a narrow vehicle which moves underground along the mineral seam and which is connected by pipes or hoses to water pumps at the surface of the earth. The vehicle hydraulically drills pilot holes during its entrances into the seam, and then directs sideward jets at the seam during its withdrawal from each pilot hole to comminute the mineral surrounding the pilot hole and combine it with water into a slurry, so that the slurried mineral can flow down to a location where a pump raises the slurry to the surface. Droplets of liquid carbon dioxide or other suitable material may be added to the water prior to its exit from a jet nozzle on the vehicle, so that as the water pressure drops in movement through the nozzle the liquid carbon dioxide or other material explodes into a vapor to greatly increase the velocity of the water jet.
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Frosch Robert A.
Miller Charles G.
Stephens James B.
Grifka Wilfred
Manning John R.
Mott Monte F.
Pate III William F.
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