Fine placer gold, identified in panned concentrates occurs at two sites along Jim River (Kurtak and others, 2002). At the 'Jim Prospect Confluence', a panned -concentrate contained a single, very fine grained, gold particle, with abundant magnetite. An analysis of this concentrate indicated that it contained 1,590 ppb gold. Another placer sample from the same site contained 13 very fine gold particles and an analysis showed that it has a value of 0.0003 ounce of gold per cubic yard. At a site on Jim River about 6 miles downstream from the mouth of Prospect Creek, very fine gold flakes were observed in a panned-concentrate; an analysis showed a value of 1,230 ppb gold (Kurtak and others, 1999). Kurtak and others (1999) suspect that the gold is derived from the Jim River pluton, which crops out north of the Jim River canyon.The rocks in the region are Triassic to Jurassic mafic volcanic and intrusive rocks, and mid-Cretaceous granitic, plutonic rocks (Patton and Miller, 1973). The rocks in the vicinity of the occurrences on the Jim River are altered volcanics, including pillow basalts (Kurtak and others, 2002). No bedrock was observed at the 'Jim Prospect Confluence' occurrence.