Unnamed Occurrence (ARDF - ID134; west of the head of Little Waldren Fork), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - ID134; west of the head of Little Waldren Fork)	- not defined -
Iditarod Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is at an elevation of about 2,300 feet on a prominent east-west-trending ridge. It is about 0.5 mile east of hill 2424 and about 0.3 mile southeast of the center of section 13, T. 27 N., R. 42 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence consists of 0.4- to 1.2-inch-thick quartz-axinite veins in hornfels derived from shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, Miller, and Gray, 2004). The area is cut by faults that strike northeast. The veins are oxidized to iron oxide gossan from unknown sulfide minerals. The gossan forms as clots and isolated masses an inch or more long. The geologic map of the similar prospect at the head of Bismarck Creek (ID130) includes this prospect (Bundtzen and Miller, 1997). Grab samples of mineralization contained up to 50.0 parts per million (ppm) silver, 100 ppm arsenic, 72 ppm cadmium, 150 ppm copper, 60 ppm antimony, 150 ppm tin, and 0.70 percent zinc (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988).
Alteration: Development of axinite-quartz greisen; pervasive oxidization to gossan.

Commodities (Major) - Ag, Sn, Zn; (Minor) - As, Cd, Cu, Sb
Development Status: None
Deposit Model: Sn-polymetallic vein or Polymetallic vein (Cox and Singer, 1986; models 20b and

Other Databases

Link to USGS - Alaska:	ID134

Other Regions, Features and Areas containing this locality

References