EE IS A COAL TRUCK OPERATOR & WHILE IN THE PIT WAITING TO LOAD AT THE SHOVEL, GOT DOWN FROM THE TRUCK TO CHECK A SUSPECTED COOLANT LEAK. SHE DID NOT SEE A SMALL BERM IN THE HAUL ROAD & WHEN ST EPPING DOWN FROM THE TRUCK, SHE STEPPED ON THE BERM AND INJURED HER KNEE. SHE WAS NOT ABLE TO WORK HER NEXT 2 SCHEDULED SHIFTS. APRIL 28 WAS A HOLIDAY AND NO WORK WAS SCHEDULED.