A PARTIAL COUNTY POWER OUTAGE CAUSED A TOTAL MINE SITE BLACKOUT. THE SITE POWER OUTAGE RESULTED IN THE MINES HOIST BEING INOPERABLE FOR A PERIOD EXCEEDING 30 MINUTES. MSHA WAS NOTIFIED AS PER 30 CFR PART 50. HOISTING OPERATIONS RESUMED ONCE THE MINE SITE POWER WAS RESTORED.