Jago River

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals azurite; malachite

Geographic location

Quadrangle map, 1:250,000-scale DP
Latitude 69.28
Longitude -143.6
Nearby scientific data Find additional scientific data near this location
Location and accuracy Accurate to within 1,525 meters (5,000 ft). Brosge' and Reiser, 1976, Locality 38 and Grybeck, 1977, p. 42, Locality 7.

Geologic setting

Geologic description

Malachite and azurite are present in calcareous hornfels adjacent to the Jago stock. The host rock is Cambrian sandstone near contact with the granite.
An isolated stock of granite of Early Devonian age intrudes the Neruokpuk Schist of Leffingwell (1919) near the headwaters of the Jago River; although not so indicated on the geologic map of Reiser and others (1980), this probably the is Jago stock as described here. The same map unit, the Neruokpuk Schist of Leffingwell (1919) was examined along the U.S.-Canada border where it consists of arkosic sandstone in which labile clasts including most of the potassium feldspar grains have been altered to white micas, quartz, other minerals (Kelley and others, 1995). This same unit likely is Cambrian in age along the border (Lane and othes, 1995) rather than Precambrian as indicated by Reiser and others (1980) (Lane and others, 1995).
Geologic map unit (-143.602708182926, 69.2797462552067)
Mineral deposit model Lode; disseminated, possibly skarn.
Age of mineralization Probably Early Devonian.

Production and reserves

Indication of production None