"Where a mining company let a contract for taking out a certain quantity of ore, but employed persons of supposed skill to watch for dangers from loosened rocks, and in other ways retained a control over the mode of mining, and a servant of the contractors was killed by the falling of a rock, the danger from which ought to have been detected and guarded against: Held, that the mining company was responsible."
Cooley, Thomas M. "Lake Superior Mining Co. v. Catharine Erickson." Am. L. Reg. 27, no. 1 (1879): 28-37.