Hope Creek

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Cu; Mo; Pb; REE; Sb; W
Ore minerals allanite; galena; gold; malachite; molybdenite; pyrrhotite; rutile; scheelite; stibnite

Geographic location

Quadrangle map, 1:250,000-scale CI
Quadrangle map, 1:63,360-scale B-5
Latitude 65.4
Longitude -146.354
Nearby scientific data Find additional scientific data near this location
Location and accuracy The location is the approximate center of mining activity along Hope Creek. Mining activity occurred at several locations along the creek, specifically at 65.40 N, 146.32 W and 65.40 N , 146.36 W. Hope Creek is a tributary to Faith Creek.

Geologic setting

Geologic description

Bedrock exposure is rare in the Hope Creek area, except on ridgetops, and locally along creeks. Micaceous quartzite, typically weathering to massive slabs and blocks, is the most abundant rubble and forms most of the bedrock outcrops. White, sulfide-free, quartz lenses, segregations and veinlets are common in the quartzite. Quartz-mica schist and pelitic schist also form some outcrops. Nonfoliated hornblende quartz monzonite occurs as small bodies in Hope Creek drainage. The rock varies in composition between quartz monzonite and monzogranite. Hornblende quartz monzonite is commonly altered to chlorite-ankerite-sericite with or without pyrite. Fluorite and garnet are occasionally present. Alteration occurs both along plutonic contacts and along shear zones within the plutons. Numerous cobbles and boulders of sulfide-bearing hornfels occur in Hope Creek. Samples of sulfide-bearing hornfels and quartz-monzonite north of Hope Creek are strongly anomalous in As (up to 7,000 ppm) and Au (up to 550 ppb) and moderately anomalous in Sb (up to 120 ppb). Sulfide-bearing hornfels and quartz monzonite samples from south of Hope Creek are also anomalous in these elements with maximum values of 53 ppm As, 43 ppb Au, and 29 ppb Sb. Virtually no mineralization was observed in metamorphic rocks away from plutonic contacts. In summary, sulfide-bearing hornfels and altered quartz monzonite samples near hornblende quartz monzonite contacts are the most gold-rich rocks found in the Hope Creek drainage. (Swainbank and Burton, 1987, p. 6-19 to 6-22)
Placer gold was found in stream gravel, apparently in subeconomic amounts. Stibnite deposits were reportedly found in 1926, but were apparently reburied by 1942 (Joesting, 1943, p. 12).
Geologic map unit (-146.356471205555, 65.3996031644972)
Mineral deposit model Placer gold deposit (Cox and Singer, 1986; model 39a); Gold-rich sulfide-bearing hornfels and quartz monzonite.
Mineral deposit model number 39a

Production and reserves

Workings or exploration Placer gold was discovered in the early 1900s but was never mined extensively (Menzie and others, 1983, p. 46).
Indication of production Undetermined

Additional comments

See also Faith Creek, ARDF no. CI018.


MRDS Number A012221; D002674


Lampright, R.L., 1996, Gold placer deposits near Fairbanks Alaska--An inventory of the gold placer mines, prospects, and deposits located within the Big Delta Charley River, Circle, Eagle, Fairbanks, and Livengood quadrangles: Nederland, Colorado, Iron Fire Publications, Anchorage, Alaska, 135 p.
Reporters C.J. Freeman, J.R. Guidetti Schaefer, A.S. Clements (Avalon Development Corporation)
Last report date 9/9/1998