A HIGHWALL FAILURE OCCURRED IN THE UNDERGROUND PIT AREA ON THE WEST SIDE OF THE HIGHWALL. VERY LITTLE ROCK WAS DISLODGED FROM THE HIGHWALL. APPROX. 14 CRACKS APPEARED IN THE SERVICE ROAD NEAR THE TOP OF THE HIGHWALL, RANGING FROM 1"" TO 21"" WIDE, FOR A DISTANCE OF 381 FEET.