Stability of an Underground Room in Frozen Gravel.
Proc 9th Ann Symp Eng Geology and Soils Eng Boise Idaho 4/5- 7/71 10/71 PP 3-30 :3-30
Research was conducted by the Bureau of Mines to aid in estimating the economic and technological feasibility of mining gold from frozen gravel placers in Alaska. This presentation describes the progress of one of several projects conducted. As part of this study the Spokane Mining Research Center undertook to determine the conditions under which a 30- by 70-foot underground room would safely remain open without artificial supports. The evaluation was instrumented with closure points, thermocouples, recording thermometers, and hydraulic props.
Proc. 9th Ann. Symp. Eng. Geology and Soils Eng., Boise, Idaho, 4/5- 7/71, 10/71, PP. 3-30