EE WAS ASSIGNED TO SECURE METAL OVERCAST STEPS IN PLACE. EE WAS STANDING ON THE STEPS THAT WERE UNSECURED ATTEMPTING TO SECURE THEM. THE STEPS SLID DOWN THE WALL OF THE OVERCAST WITH THE EE RIDING THEM. CAUSE OF INJURY WAS ATTITUDE/LACK OF SAFETY AWARENESS. COMPLIANCE WITH RULES/REGS.WAS NOT A FACTOR, PROTECTIVE EQUIP. NOT A FACTOR, MINING EQUIP./SYSTEMS NOT A FACTOR.