As a result,the short hole shrinkage method with flat bottom structure was employed to mine the stope firstly,then stoping ore pillar by medium length hole caving method. 后溝金礦採用平底結構淺孔留礦法先採礦房，後用中深孔崩落法回採礦柱，經兩年多的生產實踐，取得較好的技術經濟指標。
The feasibility of which short-hole shrinkage method is used for mining of low-grade and submarginal ores in Huanren Mine is demonstrated in this paper. 論證了採用淺孔留礦法對桓仁礦北岔區的低品位礦及表外礦進行綜合回收的可行性。
