Extra Dry Creek

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale NM
Latitude 64.5658
Longitude -165.284
Nearby scientific data Find additional scientific data near this location
Location and accuracy This alluvial gold placer mine is on Extra Dry Creek, an east tributary to Nome River. The map location is at about the midpoint of the creek, just northwest of the center of section 4, T. 11 S., R. 33 W., Kateel River Meridian. It is locality 119 of Cobb (1972 [MF 463], 1978 [OFR 78-93]).

Geologic setting

Geologic description

The alluvial gold placer deposit in the upper canyon of Extra Dry Creek was worked by hand and produced about 1,000 ounces of gold between 1900 and 1903 (Brooks and others, 1901; Collier and others, 1908). The unconsolidated deposits about one-half mile below the head of the creek included, top to bottom, 1 foot of muck, 1 foot of sandy clay, and 6 feet of schist and quartz gravel on bedrock; pay was in the lower 2 feet of gravel. Some coarse gold was recovered; the largest nugget found in 1900 was about 0.6 ounce (Brooks and others, 1901; Moffit, 1913). Bedrock has been mapped as mica schist containing marble interlayers (Brooks and others, 1901; Moffit, 1913), mainly metagranodiorite (Hummel, 1962 [MF 247]), and mainly porphyroclastic micaceous graphitic schist and graphitic quartz schist (Bundtzen and others, 1994). The gold possibly had a local bedrock source; it apparently becomes finer grained downstream. Some of the gold had attached quartz (Collier and others, 1908, p. 176).
Geologic map unit (-165.286606372921, 64.5650374926022)
Mineral deposit model Alluvial placer Au (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary.

Production and reserves

Workings or exploration Extra Dry Creek was worked by shovel-in or rocker methods from 1900 until about 1905. Moffit (1913) thought that the creek was worked out by about 1905 or 1906. Tailings along the creek down to the Nome River road and suggest that the lower part of the creek was worked mechanically in later years.
Indication of production Yes; small
Production notes About 1,000 ounces of gold were recovered from this creek between 1900 and 1903 (Collier and others, 1908; Moffit, 1913). Lower grade deposits may have been mined on the lower creek in later years, but records of ny such production are not available.

References

MRDS Number A012939

References

Reporters C.C. Hawley and Travis L. Hudson
Last report date 7/10/2000