Johnston Creek

Prospect, Undetermined

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale NM
Quadrangle map, 1:63,360-scale D-2
Latitude 64.8547
Longitude -165.9154
Nearby scientific data Find additional scientific data near this location
Location and accuracy Johnston Creek is a headwater tributary of the Feather River. The creek rises on the southwest flank of the Kigluaik Mountains and parallels the uppermost course of the Feather River, which is the next stream to the west. The location given is the approximate midpoint of placer mining claims shown as Kardex site Kx 52-87 of Heiner and Porter (1972).

Geologic setting

Geologic description

Johnston Creek occupies a glacial valley on the southwest flank of the Kigluaik Mountains. Placer mining claims have been located on the creek (Kardex site Kx 52-87, Heiner and Porter, 1972), but placer gold deposits are probably of river-bar type and transient in nature. Bedrock in this area is mostly amphibolite facies metasedimentary rocks (Sainsbury, Hummel, and Hudson, 1972; Till and Dumoulin, 1994; Hannula and others, 1995).
Geologic map unit (-165.91803982377, 64.853932366172)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Holocene.

Production and reserves

Workings or exploration Probably surface mining only by rocker or small-scale sluicing.
Indication of production Undetermined

References

MRDS Number 10307907

References

Hannula, K.A., Miller, E.L., Dumitru, T.A., Lee, Jeffrey, and Rubin, C.M., 1995, Structural and metamorphic relations in the southwest Seward Peninsula, Alaska; Crustal extension and the unroofing of blueschists: Geological Society of America Bulletin, v. 107, p. 536-553.
Heiner, L.E., and Porter, Eve, 1972, Alaska Mineral Properties, volume 2: University of Alaska, Mineral Industry Research Laboratory Report 24, 669 p.
Till, A.B., and Dumoulin, J.A, 1994, Geology of Seward Peninsula and St. Lawrence Island, in Plafker, G., and Berg, H.C., eds., The Geology of Alaska: Geological Society of America, DNAG, The Geology of North America, v. G-1, p. 141-152.
Reporters C.C. Hawley and Travis L. Hudson
Last report date 10/22/1999