Iron Creek (lower)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Fe
Other commodities Pb
Ore minerals hematite; limonite

Geographic location

Quadrangle map, 1:250,000-scale NM
Quadrangle map, 1:63,360-scale C-2
Latitude 64.7228
Longitude -165.7285
Nearby scientific data Find additional scientific data near this location
Location and accuracy Iron Creek is an informally named, small west tributary to Cripple River that is not shown on the current U.S. Geological Survey topographic map. This occurrence is 2 miles northeast of the Nome-Teller road. The occurrence, called the Lower Iron Creek gossan by Herreid (1970, figure 1), is about a half mile west of the mouth of Gold Run, another tributary to the Cripple River. The occurrence is at about 500 to 600 feet elevation and located to within about 500 feet.

Geologic setting

Geologic description

The Lower Iron Creek gossan was located by Herreid (1970, figure 1) and shown to be about 600 feet long in a north-northwest direction. It is in massive marble, probably the same as the massive marble unit of Bundtzen and others (1994). This occurrence is probably similar to other iron oxide deposits in the area such as the Cub Bear prospect (NM133) and Iron Creek prospect (NM131). Herreid (1970) noted anomalous lead at this prospect, but it is not reflected in the one sample for which an analysis was reported from the occurrence (sample 146, Herreid, 1970).
The origin of the iron deposits in the area is uncertain. They may be iron oxide gossan developed by the oxidation of sulfide deposits (Eakin, 1915 [B 622-I, p. 361-365]; Mulligan and Hess, 1965; Herreid, 1970). Alternatively, they could be hypogene iron oxide (and iron carbonate) deposits. Inasmuch as several similar iron deposits nearby, such as the American prospect (NM014) and the Monarch prospect (NM017), contain anomalous amounts of zinc, they could be transitional to zinc-lead-fluorite deposits such as the Quarry prospect (NM135).
Geologic map unit (-165.731135073707, 64.7220360462225)
Mineral deposit model Iron oxide veins and replacement of marble and schist.
Age of mineralization Post mid-Cretaceous, the age of metamorphism of the host carbonate rocks.

Production and reserves

Workings or exploration Surface exposure only; workings have not been described at this locality although it was probably prospected before 1915, as were other iron oxide prospects in the area.
Indication of production None