Method of underground mining by pillar extraction

Patent · Tue Aug 12 04:00:00 EDT 1980

OSTI ID:863629

Bowen, Ray J ^[1]; Bowen, William R ^[2]

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1. 1879 Delann, Salt Lake City, UT 84121
2. 1636 Sunnydale La., Salt Lake City, UT 84108

A method of sublevel caving and pillar and top coal extraction for mining thick coal seams includes the advance mining of rooms and crosscuts along the bottom of a seam to a height of about eight feet, and the retreat mining of the top coal from the rooms, crosscuts and portions of the pillars remaining from formation of the rooms and cross-cuts. In the retreat mining, a pocket is formed in a pillar, the top coal above the pocket is drilled, charged and shot, and then the fallen coal is loaded by a continuous miner so that the operator remains under a roof which has not been shot. The top coal from that portion of the room adjacent the pocket is then mined, and another pocket is formed in the pillar. The top coal above the second pocket is mined followed by the mining of the top coal of that portion of the room adjacent the second pocket, all by use of a continuous miner which allows the operator to remain under a roof portion which has not been shot.

• Research Organization: Bowen (R.J.)
• Assignee: Bowen, Ray J. (1879 Delann, Salt Lake City, UT 84121);Bowen, William R. (1636 Sunnydale La., Salt Lake City, UT 84108)
• Patent Number(s): US 4216998
• Application Number: 06/044,391
• OSTI ID: 863629
• Country of Publication: United States
• Language: English

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