METHOD FOR MINING OF THIN GENTLY DIPPING AND INCLINED ORE DEPOSITS Russian patent published in 1996 - IPC

FIELD: underground mining of ore with blasting of enclosing rocks. SUBSTANCE: method for mining of thin gently dipping and inclined ore deposits includes driving of development and preparatory workings; drilling of ore and rock blast holes in stope along the strike of deposit from the end of haulage trench. Blast holes are charged with explosive and blasted with short delay and delay for the value of advance for cycle. Ore is extracted in rising manner by two adjacent stopes along the strike simultaneously. Ore face is cleaned and haulage trench is formed in the rocks of lying wall in the second stope which is worked with lag from the first stope for a value of advance for cycle. Roof is bolted. In the second stope, drilling is accomplished along the strike of deposit, and in the first stope, drilling is effected to the rise from the underlying haulage horizon. Explosive charges in ore blast holes of two stopes and rock blast holes of lying wall in the second stope are fired with short delay. Ore in the first and second stopes is broken into trench of underlying haulage horizon by advance firing of blast holes of the second stope relative to the blast holes of the first stope onto movable barrier which is installed in the flank of underlying haulage horizon. Broken rock is moved to stope worked out space in the given instance, to the lower haulage horizon after its arrangement of the floor of the second stope by transporting through worked out space of the first stope. Ore from trench of lower haulage horizon is lifted to the surface. EFFECT: reduced labor input in stopping operations. 3 dwg