ORE/ROCK SIZE EFFECTS ON THE ORE DRAWING CONTROL IN SUBLEVEL CAVING

In this paper, a moldel of ore drawing for low dilution is described. Three experiments of oredrawing in sublevel caving, those caved lump rock is biger than, equal to and smaner than blasted ore respectively, was made. It has been found that optimal results of ore drawing in sublevel caving can be obtained by adoption of ore drawing control in which the blasted ore is to be drawn until the caved rock appeared on the outlet ofore drawing when the rock is biger than or equal to the ore, and, for other cases, drawn until the rock wasflowing out of the outlet consecutively.