METHOD FOR HYDRAULIC BOREHOLE MINING AND DEVICE FOR ITS REALIZATION Russian patent published in 1994 - IPC

FIELD: hydraulic borehole mining. SUBSTANCE: before starting wash-out, formed at formation roof is slotted opening corresponding to design dimensions of chamber. The latter is filled with material with positive buoyancy in water. Initial area is subjected to wash-out through its entire thickness. Rock is removed by successive undercutting of each layer at the foot of circular stope and wash out of rock layer sliding to foot. In course of mining, additionally fed to gob is material with positive buoyancy. Device has flexible tie in form of chain of articulated plate links with longitudinal trough. Tie, and air and pulp-feeding hoses are accommodated inside water hole. Pulp feeding hose is located in trough. EFFECT: higher efficiency. 2 cl, 7 dwg