Mystery Mountains West

The Mystery Mountains West is a zinc and lead mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Mystery Mountains West

Commodity

Primary: Zinc
Primary: Lead
Secondary: Silver

Location

State: Alaska
District: McGrath

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Sericite in dike rocks.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Sphalerite
Ore: Galena
Gangue: Quartz

Comments

Comment (Deposit): Other Comments = See Ursus prospect (MD033).

Comment (Exploration): Status = Inactive

Comment (Geology): Geologic Description = The Mystery Mountains West occurrence consists of galena, sphalerite, and quartz in hornfels, and locally in quartz-tourmaline breccias in hornfels. Altered dikes cut the hornfels on the property. The Mystery Mountains West occurrence represents an outer-most metallic lead-zinc zonation observed in the Mystery Mountains mineralized area, which is thought to be a large-scale copper porphyry system. Prospects more central to the core, which include the Copenhagen Hill, Mystery Mountains-East, Frozen Creek, and Tarn prospects (MD030, MD028, MD032, MD027) are representative of a copper-gold bearing core. The Ursus prospect (MD033), like the Mystery Mountains West mineralization, represents a southern, outer lead-zinc zone (DiMarchi and others, 1997). The Mystery Mountains West occurrence is inferred to be Late Cretaceous, based on isotopic ages of plutonic rocks in Mystery Mountains (Moll and others, 1981). No assay data was found for this summary.

Comment (Deposit): Model Name = Polymetallic vein deposits (Cox and Singer, 1986; model no. 22c)

Comment (Workings): Workings / Exploration = Mystery Mountains West is one of a number of prospects related to a large porphyry copper-gold target explored in the Mystery Mountains by WGM Inc., ACNC, and ASA Inc. from 1975 to 1997 (DiMarchi and others, 1997). No assay data was found for this summary.

Comment (Geology): Age = the Mystery Mountains West occurrence is inferred to be Late Cretaceous, based on isotopic ages of plutonic rocks in Mystery Mountains (Moll and others, 1981).

Comment (Reference): Primary Reference = DiMarchi and others, 1997

References

Reference (Deposit): DiMarchi, J.J., and Frantz, P.S., 1997, Annual Report for 1997-Doyon Option Lands, Block 10: ASA Inc.-Montague Gold Joint Venture Report, Volume II: Unpublished report, 189 p. (Report held by Doyon, Limited, Fairbanks, Alaska.)

Reference (Deposit): Moll, E.J., Silberman, M.L., and Patton, W.W. Jr., 1981, Chemistry, mineralogy, and K-Ar ages of igneous and metamorphic rocks of the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811C, 15 p., 2 sheets, scale 1:250,000.

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