nearGrassValley,andtheunnamedcreek thatrunsthroughMemorialParkinGrass Valley.TheEmpireMinewastherichest hard-rockmineintheStateofCalifornia, producing5.8millionouncesofgoldinits operatinghistoryof106years(1850-1956). In1929,EmpireStarMinesCompany,a predecessorofNewmont,purchasedthe ...