On 4/5/2015 at 8:55 am #31 Hoist would not operate due to having no 110V control power. 9:00 am called underground shop to report problem and evacuate mine, and called electricians. Electricians came to troubleshoot and repairs made. Hoist was tested and put back into operation. MSHA was called back at 1:15 pm to report problem was repaired.