METHOD OF BORE-HOLE HYDRAULIC MINING OF MINERALS IN MASSIVE DEPOSITS Russian patent published in 1997 - IPC

FIELD: mining industry. SUBSTANCE: massive deposit exposed by productive bore-holes is divided into levels and mined by cylindrical chambers by cutting and layer by layer extraction of mineral from bottom upwards. Chambers are formed in rows with staggered positioning and worked with advance in adjacent chambers and rows to height of at least of one level. Filling of worked-out space is effected as chambers are being emptied. First filled on chamber bottom coaxially with chamber is cone of noncohesive material with creation of circular clearance between its base and chamber wall. Then, delivered into thus formed clearance is hardening mixture from which ring is formed of height less than height of filled cone. After hardening mixture is set, cone is built up until circular clearance is formed which is similar to previous one. Delivery of hardening and noncohesive materials is repeated until vertex of cone is at level of layer height. Then, hardening material is delivered until its surface reaches vertex of cone, thus forming chamber bottom on which next layer of mineral is to be thrown. EFFECT: high efficiency. 3 dwg