Wis. Stat. § 107.11
Every person operating a metal recovery system and every purchaser of nonferrous metallic minerals shall keep a substantially bound book, ruled into suitable columns, in which shall be entered from day to day, as nonferrous metallic minerals are received, the following items: the day, month and year when received; the name of the person from whom purchased; the name of the person by whom hauled and delivered; name of the owner of the land from which the nonferrous metallic minerals were obtained, or if not known, the name of the diggings or some distinct description of the land. The bound book shall be kept at the furnace or at the usual place of business of such person or purchaser or his or her agent in this state, and shall be open to authorized representatives of the department of revenue at reasonable times for inspection and taking extracts.
Wis. Stat. § 107.11