The Donna Loy was a talc mine. Talc mines in the Death Valley region began in the early 1900s through the 1990s. My understanding is asbestos played a part in their closing.
Based on the exposed items surfacing from a buried dump site, the Donna Loy was probably circa WWII.
Due to the lack of lumber, most camp sites housed miners in tents. Rock formations denote tent sites.
On we went to China Ranch, just a few minutes away.