爱达荷大学矿山系统设计与顶板控制研究所的教授、研究生与USBM和赫克拉矿业公司合作对银谷矿区鲁齐·弗里戴矿的采矿方法进行了综合研究。适应深井开采，解决了天并支护问题，将上向充填采矿法改为下向长壁充填法，并解决了相应的充填、运矿、通风、支护、安全和岩爆问题。 Professor and graduate student at the University of Idaho Mining System Design and Roof Control Institute, in collaboration with USBM and the Hecla Mining Corporation, conducted a comprehensive study of the mining methods for the Ruze Frey mine in the Silver Valley area. Adapt to deep well mining, solve the problem of weathering and support, and change the method from filling to mining to the longwall filling method and solve the problems of filling, transporting, supporting, safety and rock burst.