Rapid River bend

Occurrence, Inactive

Commodities and mineralogy

Main commodities Mo; Pb; Sn; U
Other commodities Ag; B; Be; Bi; Cu; Zn
Ore minerals arsenuranylite; metatorbernite; uranophane; xenotime
Gangue minerals goethite; hematite; quartz

Geographic location

Quadrangle map, 1:250,000-scale CO
Quadrangle map, 1:63,360-scale C-1
Latitude 67.58
Longitude -141.28
Nearby scientific data Find additional scientific data near this location
Location and accuracy Location plotted is locality 4 of Barker (1981, p. 25). Anomalous area is approximately 1 mi (1.6 km) N-S x 2 mi (3.2 km) E-W and centered on this ridge. Does not include locations called VABM Orphan, VABM Orphan, or placer localities mentioned in Barker (1981). Located to within 1 mi (1.6 km).

Geologic setting

Geologic description

Rubble of several phases of Old Crow batholith includes 2-mica granite, aplites and granodiorite. Area has hematite and secondary uranium minerals in quartz vein and breccia float, a radon gas anomaly, and associated rock and soil anomalies.
Geologic map unit (-141.282711473275, 67.5797525459644)
Mineral deposit model Lode; felsic plutonic-associated Sn, Mo, U, +W and base metals, possible veins, greisens and porphyry deposits.
Alteration of deposit Muscovite/sericite and tourmaline are common in granodiorite/granite and aplite. Some chloritization of biotite.

Production and reserves

Workings or exploration Sample of quartz vein float contain up to 2.8 ppm Ag, >2000 ppm B, 50 ppm Be, 70 ppm Bi, 280 ppm Cu, 70 ppm Mo, 3300 ppm Pb, 300 ppm Sn, 1600 ppm U and 1500 ppm Zn. Soil samples contain up to 3100 ppm Pb, 3100 ppm Zn and 120 ppm U (Barker, 1981, p. 90-95).
Indication of production None

Additional comments

This area is just south and east of more than 38.5 square miles (100 square km) of creek drainages containing variable to abundant cassiterite, monazite, ilmenite and allanite, and variable scheelite, powellite, molybdenite and chromite in sluice samples.
Also, see MAS/MILS Sequence number 0020330009 (USBM, 1995).