The Eby Stamp Mill is an example of the type of facility used in hard rock gold mining to crush ore and is one of the few stamp mills left, recalling the Feather River’s history as a rich gold mining area. Only five of the original 10 stamps have been made part of this historic restoration. The stamps pulverized ore, which was then amalgamated with mercury in the ball mill located below the stamps. The spongy mixture was heated in a retort to vaporize the mercury, leaving concentrated gold for extraction. The Eby Mill is the only remaining gold mining machinery in evidence along the Feather River from Oroville to Quincy, although during the Gold Rush this area abounded with miners who extracted millions of dollars in gold. The mill was relocated to its present site in 1969 by P.G.&E. for public interest as part of the company’s systemwide recreation development program.