Abstract: Due to the pillarless caving method and the forming characteristics and functions of roof rock overburden layer,the principle of pillarless non-overburden stoping method is proposed to seek for reducing mining investment and costs.Based on the geological survey of foundation engineering,and cavability evaluation on the rock roof,and combining with characteristics of ore drawing with low dilution,the roof overburden layer without overhead caving is formed.Under a guarantee of relevant monitoring tools,the pillarless mining was successfully achieved.

Key words: Non overburden mining, Low dilution ore-drawing, Induced caving