Crevice Creek

Mine, Active?

Commodities and mineralogy

Main commodities Au
Other commodities Ag
Ore minerals gold; magnetite; silver

Geographic location

Quadrangle map, 1:250,000-scale WI
Quadrangle map, 1:63,360-scale B-4
Latitude 67.359
Longitude -151.9028
Nearby scientific data Find additional scientific data near this location
Location and accuracy Crevice Creek is a west-flowing tributary to John River. The mouth of Crevice Creek is approximately 0.5 mile south of the junction of the John and Allen Rivers. The center of the placer workings is about 3.5 miles upstream from the mouth of Crevice Creek, near the northeast corner of section 12, T. 29 N., R. 20 W. The workings extend for about two miles upstream and downstream. The location is accurate.

Geologic setting

Geologic description

About 3.5 miles of Crevice Creek has been placer mined. The most extensive mining was from about 2.0 miles to about 2.5 miles above its mouth. Above and below that section, most of the mining has been with suction dredges working pot holes. Bedrock is exposed or shallow along much of Crevice Creek and consists mainly of Devonian Skajit Limestone (Dillon, 1982; Dillon and others, 1986). Cracks in the weathered bedrock formed numerous natural riffles and potholes up to several feet deep that trapped much of the gold along the creek and were the locus of much of the mining (Reed, 1938; Kurtak and others, 2002). The creek is named for this features.
The concentrates contained abundant magnetite. Occasionally native silver nuggets were recovered with the gold (Kurtak and others, 2002). Bliss and others (1988) speculate that the gold is derived from sulfide-bearing quartz veins in the Devonian Skajit limestone (see WI066). Analyses by Mosier and Lewis (1986) of seven gold samples from Crevice Creek gave median values of 4.2 percent silver, 0.14 percent copper, 0.008 percent lead, and 0.47 percent mercury, and a median fineness of 958. Three of these analyses showed detectable levels (but less than 2 parts per million) palladium.
As documented by Maddren (1910, 1913), Reed (1938), and Kurtak and others (2002), mining began on Crevice Creek in 1904. Production records show that at least 117 ounces of gold was produced in several episodes of mining through 1914. At least another 105 ounces of gold was produced from 1948 to 1953. Most of the production was from 1959 to 1988 by Bill Ficus who recovered at least 2,200 ounces of gold from 1980 to 1998. Suction-dredge mining of the pot holes continued until at least 2000. The total production documented in incomplete records is 2,456 ounces of gold. Kurtak and others (2002) suggest that little gold remains, although the numerous cracks, crevices, and pot holes in the bedrock along the creek probably retain some gold amenable to suction dredging.
Geologic map unit (-151.905541793306, 67.3585395273824)
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 About 3.5 miles of Crevice Creek has been placer mined. The most extensive mining was from about 2.0 miles to about 2.5 miles above its mouth. Above and below that section, most of the mining has been with suction dredges working pot holes. As documented by Maddren (1910, 1913) Reed (1938), and Kurtak and others (2002), mining began on Crevice Creek in 1904. Production records show that at least 117 ounces of gold was produced in several episodes of mining through 1914. At least another 105 ounces of gold was produced from 1948 to 1953. Most of the production was from 1959 to 1988 by Bill Ficus who recovered at least 2,200 ounces of gold from 1980 to 1998. Suction-dredge mining of the pot holes continued until at least 2000.
Indication of production Yes
Reserve estimates Kurtak and others (2002) suggest that little gold remains, although the numerous cracks, crevices, and pot holes in the bedrock along the creek probably retain some gold amenable to suction dredging.
Production notes As documented by Maddren (1910, 1913); Reed (1938), and Kurtak and others (2002), mining began on Crevice Creek in 1904. Production records show that at least 117 ounces of gold was produced in several episodes of mining through 1914. At least another 105 ounces of gold was produced from 1948 to 1953. Most of the production was from 1959 to 1988 by Bill Ficus who recovered at least 2,200 ounces of gold from 1980 to 1998. Suction-dredge mining of the pot holes continued until at least 2000. The total production documented in incomplete records is 2,456 ounces of gold.

References