Abstract: The natural caving method is an underground mining method with the lowest cost in a Copper and Molybdenum mine.Two indexes-rock quality designation and gravity stress field of rock mass were used to research the cavability of the mine, and the natural caving method to exploit the mine were determined.Combine the yield way of shallow holes and medium-length holes to remove the ore, and employ the combination of spray support, setting spot holder, and optimizing pull bottom structure to control the ground pressure.Fabulous effects are achieved with the application of this method.This method improves ore rock stability, increases the allowed exposed area of the roof and hanging wall, improves ore drawing efficiency, enhances mining operations security, and enhances the management experience of the ground pressure controlling, construction and ore supplying.

Key words: Natural caving method, Rock quality designation, Gravity stress field of rock mass, Cavability