Unnamed (east flank of Glacier Peak)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag
Other commodities Au; Pb; Sb
Ore minerals boulangerite; galena; pyrite; sphalerite
Gangue minerals quartz; siderite

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale C-2
Latitude 63.5706
Longitude -150.7802
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4000 feet on the east flank of Glacier Peak about 1/2 mile northeast of hilltop 4310. It is about 0.4 mile due east of section 35, T. 15 S., R. 17 W., Fairbanks Meridian. The location is accurate within 500 feet. The occurrence corresponds to number 49 of Bundtzen, Smith, and Tosdal (1976), 215 of Hawley and Associates (1978), 57 of Bundtzen (1981), and 71 of Thornsberry, McKee, and Salisbury (1984).

Geologic setting

Geologic description

The country rock in the area of this occurrence is west-dipping micaceous quartz schist of the upper Precambrian Birch Creek Schist (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984). The occurrence, a poorly-exposed outcrop, consists of a mineralized quartz-siderite vein that strikes NE and is nearly vertical. The vein contains boulangerite, pyrite, and probably sphalerite and galena. Mineralogically, the vein is similar to the one at the nearby Glenn prospect (MM075). A selected sample assayed 9.37 ounces of silver per ton, 3.5 percent lead, 2.6 percent zinc, and 1.19 percent antimony. Soils collected nearby were anomalous (Hawley and Associates, 1978, fig. 4.1-A(1)). Soil sample 215, collected near the occurrence, was anomalous in lead, zinc, silver, and gold; sample 229, collected downslope east of the occurrence, was anomalous in gold.
Geologic map unit (-150.78248476145, 63.5700974855161)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization The deposit is assumed to be Eocene (see record MM091).

Production and reserves

Workings or exploration The deposit was discovered during regional geologic mapping by Bundtzen, Smith, and Tosdal (1976).
Indication of production None

Additional comments

The occurrence is in Denali National Park and Preserve.