Marilee

Prospect, Inactive

Commodities and mineralogy

Main commodities Au; Pb
Other commodities Ag; As; Sb
Ore minerals galena; pyrite; stibnite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale C-2
Latitude 63.5526
Longitude -150.7808
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Marilee group of 8 claims is on the ridge between Rainy Creek and the West Fork of Glen Creek. The group, at an average elevation of about 3650 feet, is mainly in the SE1/4 SE1/4 of section 2, T. 16 S., R. 17 W., Fairbanks Meridian. The location is described in Alaska State Kardex file 66-56 (Hawley and Associates, 1978; Heiner and Porter, 1972). It is probably accurate within 500 feet. The site correponds to occurrence 67 of Thornsberry, McKee, and Salisbury (1984), and possibly to unpatented claims reported in this vicinity by Wells (1933).

Geologic setting

Geologic description

The Marilee prospect is along and near a northeast-striking fault contact between the Birch Creek Schist and metafelsite of the Spruce Creek sequence (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, fig. K-2, also v. 2, occurrence 67). Wells (1933, p. 373) described mineralized zones subparallel to thin-bedded schist on the ridge between Rainy Creek and the West Fork of Glen Creek.
The deposit consists of at least three quartz veins and two mineralized shear zones. The southeasternmost shear zone is the contact between the Spruce Creek and Birch Creek rocks. The quartz veins contain mainly pyrite, along with less-abundant galena and possibly stibnite. Assays show anomalous amounts of silver, antimony, and arsenic (Wells, 1933; Thornsberry, McKee, and Salisbury, 1984, occurrence 67).
Geologic map unit (-150.783082613141, 63.5520974254666)
Mineral deposit model Low-sulfide gold?-quartz vein (Cox and Singer, 1986; model 36a?).
Mineral deposit model number 36a?
Age of mineralization The deposit is assumed to be Eocene (see record MM091).
Alteration of deposit Silicification of metafelsite.

Production and reserves

Workings or exploration The area was prospected by several pits and trenches, since caved, on the ridge between Rainy Creek and the West Fork of Glen Creek (Wells, 1933, p. 373). Claims were located as the Marilee group by Sinclair Oil & Gas in 1961, but were inactive in the 1970s (Heiner and Porter, 1972; Hawley and Associates, 1978), and in the 1980s, when they were investigated by the U.S. Bureau of Mines (Thornsberry, McKee, and Salisbury, 1984).
Indication of production None

Additional comments

The prospect is in Denali National Park and Preserve.

References