METHOD OF HYDRODRILLING MINING OF THIN AND MEDIUM THICKNESS BEDS Russian patent published in 2001 - IPC

FIELD: mining industry; applicable in mining of thin and medium thickness beds with dip angle above 4 deg. SUBSTANCE: method includes driving of development workings and stoping by hydrodrilling method with pulp transported hydraulically. Mineral is extracted in three stages. At the first stage, pilot parallel ventilation holes are sunk by hydrodrilling method along strike of pillar with diameter of 100-200 mm spaced at distance along length equaling sum of sizes of well reamer radius and pillar width ensuring hole preservation for time of stoping. At the second stage, muck is withdrawn due to expansion of hole through full thickness of bed. In this case, water is supplied from ventilation working and introduced into hole is high-pressure hose with nozzle secured to operating set. At the third stage, pillar is recovered during reverse running of operating set by hydraulic jet at pressure of 5-6 MPa. Washing off of muck is effected through preserved hole. EFFECT: higher efficiency and safety in mining, reduced energy input in stoping and development processes. 4 dwg