This paper describes the contemporary clay mine at Hacienda Yo' K'at Yucatan, and documents the archaeological association of a restored sherd-tool of Puuc slateware in a collapsed tunnel of the mine. The shape of the sherd and its in situ position suggest that it was used to gather clay in the mine during the period of A.D. 800-1000. The paper suggests the relationship of these data to the neutron activation studies of Yucatan pottery and their contribution to the study of ancient Maya trade. -- AATA