mill site. 1. A small tract of land on or contiguous to a watercourse, suitable for the erection and operation of a mill. [Cases: Manufactures 2.] 2.Mining law. A small parcel of nonmineral public land (not exceeding five acres) claimed and occupied by an owner of a mining claim because the extra space is needed for mining or ore-reduction operations. 30 USCA ยง 42.

[Blacks Law 8th]