Francis

Mine, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities Cu
Ore minerals chalcopyrite; gold; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale C-2
Latitude 63.5382
Longitude -150.9589
Nearby scientific data Find additional scientific data near this location
Location and accuracy
The Francis mine (Cobb, 1980 [OFR 80-363]) is on the southwest crest of Quigley Ridge at an elevation of about 2800 feet. The coordinates are for the location of the mine adit, and are accurate within about 300 feet.
The Francis mine is included with the Lucky Strike prospect (MM135) in location 5 of Cobb (1972 [MF 366]) and in number 4 of MacKevett and Holloway (1977). The mine is included in number 23 of Bundtzen (1981) and number 31 of Thornsberry, McKee, and Salisbury (1984). It is patented claim 13 of Hawley and Associates (1978).

Geologic setting

Geologic description

The country rock on the Francis claim consists of metafelsite and graphitic phyllite of the Spruce Creek sequence (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, fig. K-2, also v. 2, location 31). The deposit is a 1- to 3.5-foot-thick mineralized quartz vein that strikes N. 55 E., and dips about 65 S. It can be followed in old workings and pits for several hundred feet and projects towards a vein of similar strike and dip on the adjacent Little Maud claim (MM119). The vein is mostly white quartz containing some pyrite and copper sulfide. Samples from the Francis vein collected by Davis (1923) and Wells (1933) were low grade, but Wells noted that some of the quartz contains visible free gold. Davis (1924) noted that the owners of the property reported finding vein material valued at about $35, or about 1.75 ounce of gold, per ton. Bundtzen (1981) reported another vein on the property that strikes about N75E and dips vertically.
Geologic map unit (-150.961186372271, 63.5376933616222)
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).

Production and reserves

Workings or exploration The Francis vein was developed by a drift adit about 70-75 feet long that was probably driven before 1920. The Francis claim area was explored by Moneta-Porcupine in 1960-61 (Seraphim, 1962).
Indication of production Yes; small
Production notes Bundtzen (1981) reported that a few tons of ore were produced from the Francis mine. Presumably, this ore was the richer, free-gold bearing, material reported by Davis (1923) and Wells (1933).

Additional comments

The claim is in Denali National Park and Preserve.

References

MRDS Number A011213

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 4/22/2001