Mining system

Mining or in situ disintegration of hard material – Processes – With material-handling

Reexamination Certificate

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Reexamination Certificate

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06913321

ABSTRACT:
A method for extracting mineral deposits in a mineral reserve, a portion being accessible from a sloping surface and the remaining portion being inaccessible, is disclosed. The sloping surface is mined to create a bench and highwall for providing access to the mineral reserve around the accessible portion. Then, a surface is formed in the highwall to create an insertion highwall between an endwall extending from the insertion highwall and the inaccessible portion of the mineral reserve. A starter entry is created for cutting into the mineral reserve across the entire length of the insertion highwall from the endwall to the inaccessible portion of the mineral reserve. Roof supports are advanced into the starter entry with spoil added to form a starter passage from the endwall to the inaccessible portion of the mineral reserve. Shortwall or longwall mining techniques are then used to mine the mineral reserve along the starter passage. Canopies are positioned at both ends of the starter passage to seal the passage and provide ventilation of the active mining area by the introduction of air along the face of the mineral seam. A single-gate passage is formed extending from the insertion highwall adjacent the inaccessible portion of the mineral reserve to allow the continuous miner to form another opposing endwall. Mining then continues in the starter passage along the insertion highwall from the single-gate passage to the opposing endwall, thereby forming a production passage into which the roof supports are farther advanced with gob forming behind.

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J. Richard Lucas, Christopher Haycocks, Coordinating Editors,SME Mining Engineering Handbook,“Underground Mining Systems and Equipment”, vol. 1, Section 12-1—12-262, 1973.
Eugene P. Phleider, Coordinating Editor,SME Mining Engineering Handbook,“Planning and Designing for Mining Conservation”, vol. 2, Section 19-1—19-23, 1973.
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Jerry Tien, P.E., Longwall Caving in Thick Seams, Coal Age, Apr. 1998, pp. 52-54.

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