From the plaque:
M.H. Farley, working for the Silver Mountain Mining Company in the Coso Mountains, conceived the idea in 1860 of building a processing
mill on a creek that flowed into Owens Lake. He explored
and named Olancha Pass that year, and completed the first mill and furnace in the Owens
River Valley by December of 1862.
It was located on Olancha Creek about one mile west of
Plaque placed by the California State Park Commission in cooperation with the Southern Inyo Chamber of Commerce, January 30, 1965.