A roof fall occurred 300' outby spad No. 10952 in the return air course. The fall measured 30'x 20'x 10' thick and was roof bolted with 3/4"" dia., 6' long tension rebar roof bolts with 8""x8"" plates with rock shields and supplemented with 10' long cable bolts. The fall may have occurred due to over mining approximately 70' above.