I just go tback from a trip to Reno with my son. We played the "Silver Mine " machines at Cal Neva some. Won 6 very common silver dollars for $70. It was fun. Just play 1 quarter per spin. A slot gal was surprised to see my son with 6 of them as she saw someone earlier play quite a bit and win none. I think they have 3 of the machines in the casino.