Unnamed Occurrence (ARDF - MM160; Mt. Eielson district west of Muldrow Glacier), Kantishna Mining District, Denali Borough, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MM160; Mt. Eielson district west of Muldrow Glacier)	- not defined -
Kantishna Mining District	Mining District
Denali Borough	Borough
Alaska	State
USA	Country

The area is within Denali National Park and Preserve.
Location: This record describes Mt. Eielson-type (MM166) mineral deposits reported by Reed (1933, pl. 22) on the west side of Muldrow Glacier 'along the south side of the valley lying north of mountain principally composed of Tertiary volcanic rocks.' The area is probably about due west of the point that Intermittent Creek flows into the east side of Muldrow Glacier and south of the point where the glacier begins to trend almost due west. For this record, the site is at an elevation of about 3200 feet in the NW1/4 sec. 8, T. 18 S., R. 15 W., Fairbanks Meridian. The location is probably accurate within a radius of one mile.
Geology: A mass of mid-Tertiary, porphyritic granodiorite containing roof pendants of Paleozoic sedimentary rocks crops out of north of an outcrop area of Tertiary volcanic rocks on the west side of lower Muldrow Glacier (Reed, 1933, plate 22). Although Reed did not describe any specific mineral occurrences at this site, he reported that mineral deposits of Mt. Eielson-type (MM166) are relatively abundant (Reed, 1933, p. 284). By extrapolation from the type area, the deposits are presumed to be replacement lodes or skarn containing sphalerite, along with lesser amounts of galena and chalcopyrite. The mineralization presumably is Oligocene, roughly contemporaneous with the Eocene or Oligocene emplacement age of the Mt. Eielson granodiorite (Decker and Gilbert, 1978; Cole, 1998).
Age: The mineralization presumably is Oligocene, roughly contemporaneous with the Eocene or Oligocene emplacement age of the Mt. Eielson granodiorite (Decker and Gilbert, 1978; Cole, 1998).
Alteration: Introduction of calcite, epidote, and quartz into sedimentary rock roof pendants in porphyritic granodiorite.

Commodities (Major) - Pb, Zn; (Minor) - Ag, Au, Cu
Development Status: None
Deposit Model: Presumably similar to the Zn-Pb replacement and skarn deposits of the main Mt.

Other Databases

Link to USGS - Alaska:	MM160

Other Regions, Features and Areas containing this locality

References