EE WAS CUTTING PLASTIC BANDS OFF A 50 FT ROLL OF 1 1/4"" WATER LINE TO ADD TO THE CONTINUOUS MINER WATER SUPPLY. HE HAD A UTILITY KNIFE SNAPPED TO HIS LEFT SIDE & RATHER THAN REMOVE THE KNIFE H E ATTEMPTED TO USE IT AS IT WAS. HOLDING IT W/LEFT HAND HE ATTEMPTED TO CUT BANDS & KNIFE SLIPPEED & STRUCK HIS FINGER RESULTING IN A DEEP LACERATION WHICH REQUIRED 12 SUTURES TO CLOSE.