Penelope Creek

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale SO
Quadrangle map, 1:63,360-scale D-5
Latitude 64.863
Longitude -164.255
Nearby scientific data Find additional scientific data near this location
Location and accuracy Penelope Creek is a south tributary to the Casadepaga River. Its mouth is at an elevation of about 250 feet, about 4 miles upstream of the mouth of Big Four Creek. This is locality 63 of Cobb (1972, MF 445; 1978, OF 78-181).

Geologic setting

Geologic description

Penelope Creek was primarily placer mined along its lower part where it crosses terraces of the Casadepaga River. However, about a mile above its mouth, an exploration shaft went through 97 feet of unconsolidated materials before reaching bedrock (Smith, 1910). This shaft encountered 40 feet of well-rounded creek gravels with some gold colors, 24 feet of yellowish clay, and 29 feet of washed gravel, some colluvium, and bottomed on clay on bedrock. Bedrock is exposed along the creek about 1/4 mile further upstream. A shaft along the Casadepaga River at the mouth of Penelope Creek encountered 57 feet of unconsolidated materials over bedrock; from the surface down these consisted of fine quartz sand, fine gravel, 20 feet of blue clay, 20 feet of sand and gravel, and clay on decomposed mica schist. The mining on Penelope Creek, along the active channel where it crosses the Casadepaga River terraces, did not reach bedrock. Pans along this part of the creek were reported to carry 5 cents in gold (Brooks and others, 1901). Bedrock in the area is part of a lower Paleozoic metasedimentary assemblage (Till and others, 1986).
Geologic map unit (-164.257617950915, 64.862260378269)
Mineral deposit model Placer Au-PGE (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary; the numerous incised terraces along the Casadepaga River indicate that more than one cycle of erosion and deposition has developed placer deposits in the area. The low elevations between 170 and 270 feet along the first 11 miles of the river, suggest that Quaternary sea level fluctuations could have influenced placer development.

Production and reserves

Workings or exploration At least three exploration shafts were dug in the area, including one along the Casadepaga River at the mouth of Penelope Creek. Small-scale placer mining took place locally along the lower part of the creek.
Indication of production Yes; small