Because Zhaokou mine of Jinling iron mine of Shandong make use of strata pressure controlling theory to do reasonable dividing for declinate ore body room and pillar,the calculated recovery ratio η is up to 73 6% and maintaining the stability of mining field at the same time.
山东金岭铁矿召口分矿运用地压控制理论，对倾斜矿体房柱进行合理划分，计算回采率η达７３。