Abstract: At approximately 12:30 p.m. on November 10, 2010, Employee #1, a laborer, was setting up a rat hole drilling rig by guiding the Kelly bar into a cookie cutter auger bit lying on ground. The rat hole rig consisted of an 18-ft mast, which was hydraulically raised into position and mounted on the bed of a 1985 International heavy duty truck. The rig was powered by a diesel engine that operated the hydraulic system and the ground level rotary table that spun the cookie cutter assembly. The cookie cutter was a 28-inch by 28-inch cylinder with an attachment hub on top that the Kelly fit into, and the bottom of the cutter consisted of teeth. When the assembly was lowered, it dug a 28-inch by 28-inch hole in the ground. The Kelly bar consisted of an internal Kelly and an external Kelly. The internal Kelly fit into the female opening on the cookie cutter hub; the external fit over the male protrusion of the hub on the cookie cutter. When the cookie cutter was filled with dirt, it was raised and rotated in the opposite direction and the dirt was thrown out of slots cut into the side of the cookie cutter. Employee #1 was guiding the external Kelly onto the cookie cutter so he could set the pin that kept the cookie cutter and the Kelly attached. He looked away while making the Kelly to cookie cutter attachment and didn't notice the external Kelly was hung up on the top of the male protrusion on the cookie cutter. When he went to pin the Kelly, the external Kelly fell into position and landed on the right hand of Employee #1, amputating his right index finger and fracturing his right thumb. No injury was reported.