Lena and Silver Wires

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities Cu; Pb; Zn
Ore minerals galena; gold; limonite; malachite; pyrite; silver; sphalerite; tetrahedrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale C-2
Latitude 63.5799
Longitude -150.7057
Nearby scientific data Find additional scientific data near this location
Location and accuracy The contiguous Lena and Silver Wire claims (Cobb, 1980 [OFR 80-363]) are at an elevation of about 4200 feet on the southwest flank of Spruce Peak. They are about in the center of the SW1/4 SW1/4 section 29, T. 15 S., R. 16 W., Fairbanks Meridian. The location is accurate within 500 feet. It corresponds to number 266 of Hawley and Associates (1978), 22 of Cobb (1972 [MF 366]), 56a of Bundtzen, Smith, and Tosdal (1976), 60 of Bundtzen (1981), and 85 of Thornsberry, McKee, and Salisbury (1984).

Geologic setting

Geologic description

The country rock in the area of the Lena and Silver Wire claims, which probably have a common end line, is metafelsite of the lower Paleozoic Spruce Creek sequence. Graphitic phyllite, also of Spruce Creek affiliation, crops out southeast of the prospects. Both rock units strike NE and dip moderately to the NW, on the north flank of the Kantishna antiform (MM091) (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, fig. K-2, v. 2).
The two claims probably are on a sulfide-bearing quartz vein that strikes about N30E. The vein is 2 to 3 feet thick and contains pyrite, galena, tetrahedrite, sphalerite, malachite, and native silver. Locally, it contains nearly 50 percent galena (Davis, 1923, p. 132). Selected samples from prospect pits assayed 0.27 to 0.48 ounce of gold per ton, 129.6 to 180.3 ounce of silver per ton, 36 to 52.5 percent lead, 1.45 to 8.20 percent zinc, and 0.15 to 0.66 percent copper (Moffit, 1933, p. 333; Thornsberry, McKee, and Salisbury, 1984, v. 2). The native silver, and the high silver and gold assays indicate supergene enrichment of the deposit.
Geologic map unit (-150.707983921263, 63.579399412666)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization The deposit is assumed to be Eocene (see record MM091).
Alteration of deposit Oxidation of iron and copper minerals; supergene enrichment of silver and possibly gold.

Production and reserves

Workings or exploration The veins were discovered and prospected before 1922 (Davis, 1923). At the time of Moffit's visit in 1931, they were owned by C. A. Trudy, commissioner of the Kantishna district (Moffit, 1933). The claims were restaked in 1965 but were inactive in 1983. It appears that very little work was done after the initial prospecting.
Indication of production Undetermined

Additional comments

The claims are in Denali National Park and Preserve and have been inactive for decades.

References

MRDS Number A011228

References

Bundtzen, T.K., 1981, Geology and mineral deposits of the Kantishna Hills, Mt. McKinley quadrangle, Alaska: M. S. Thesis, University of Alaska, College, Alaska, 238 p.
Reporters C.C. Hawley
Last report date 1/31/2001