At 12:45 p.m., management was notified that the key for the secondary escape hoist had been lost. Production was stopped and all miners were transported to the surface by the primary slope hoist man car. At 1:12 p.m., MSHA was notified that the loss of this key interfered with the use of the secondary escape hoist. At 1:22 p.m., Management was notified that the key had been found.