Junction Creek

Mines, Undetermined

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale BD
Quadrangle map, 1:63,360-scale B-5
Latitude 64.333
Longitude -146.403
Nearby scientific data Find additional scientific data near this location
Location and accuracy Junction Creek, a tributary of Redmond Creek, is approximately 3.5 miles north of the town of Richardson on the Richardson Highway. This site is approximately at the center of the mining at the head of the creek in the lower half of section 5, T. 7 S., R. 7 E., of the Fairbanks Meridian. There was also drilling after WWII about 2 and 5 miles downstream; see the Geologic Description field for details.

Geologic setting

Geologic description

The Richardson District is characterized by gentle slopes and broad, alluvium-filled valleys (Prindle and Katz, 1913). The area is unglaciated and largely overlain by windblown silt, sand, and loess, locally up to 50 meters thick (Foster and others, 1979). The rocks consist of three structure-bounded units (Weber and others, 1978; Swainbank and others, 1984; Noyes and others, 2006; Freeman, 2011). There is a core that consists mainly of biotite-hornblende-feldspar-quartz gneiss and lesser amphibolite, quartzite, marble and calc-silicate hornfels. The core is bounded on the north and south by amphibolite-grade pelitic schist. The contacts between the units are probably low-angle faults; north-trending vertical faults occur widely. Weber and others (1978) assign the pre-metamorphic age of the rocks to the Precambrian or Paleozoic. They were metamorphosed in the Middle to Late Devonian and recrystallized in the Early Cretaceous (Dusel-Bacon and others, 2004; Freeman, 2011). The metamorphic rocks are intruded by 90 Ma, felsic to intermediate dikes and plugs, notable the quartz-feldspar porphyry dike at the nearby Democrat Mine (BD014).
There is little information on placer mining on Junction Creek although it was probably prospected soon after gold was discovered in the Richardson District in 1905. Metz (1991) described early drift mine and surface tailings in the Junction Creek. Most of the mining apparently took place at the head of Junction Creek in the lower half of section 5, T. 7 S., R. 7 E., but it may be more extensive. The Alaska Division of Mining Kardex file system records active claims on Junction Creek as recent as 1984.
Based on oral communications with Dan Cobin, a prospector in the area, Freeman (2011) notes that Cobin drilled one hole near the junction of Democrat Creek and Junction Creek, probably after WWII; only low gold values were found. Cobin also drilled another hole about 3 miles downstream, probably near the center of section 33, T. 6 S., R. 6 E.; no further work was done although 'good pay' was found.
Geologic map unit (-146.405357090793, 64.3325904594636)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary.

Production and reserves

Workings or exploration
There is little information on placer mining on Junction Creek although it was probably prospected soon after gold was discovered in the Richardson District in 1905. Metz (1991) described early drift mine and surface tailings in the Junction Creek. Most of the mining apparently took place at the head of Junction Creek in the lower half of section 5, T. 7 S., R. 7 E., but it may be more extensive. The Alaska Division of Mining Kardex file system records active claims on Junction Creek as recent as 1984.
Based on oral communications with Dan Cobin, a prospector in the area, Freeman (2011) notes that Cobin drilled one hole near the junction of Democrat Creek and Junction Creek, probably after WWII; only low gold values were found. Cobin also drilled another hole about 3 miles downstream, probably near the center of section 33, T. 6 S., R. 6 E.; no further work was done although 'good pay' was found.
Indication of production Yes; small
Production notes There is no record of the gold production from Junction Creek although it produced some gold from the early 1900s into at least the 1980s.

References

MRDS Number 10307228

References

Reporters Cameron S. Rombach (ADGGS); D.J. Grybeck (Contractor, USGS)
Last report date 4/1/2012