Unnamed (near Round Mtn)

Prospect in Alaska, United States with commodities Silver, Gold, Lead, Zinc, Arsenic, Antimony

Sections on this page

Identification information
Geographic coordinates
Site location context
Geographic areas
Commodities
Materials information
Alteration
Mineral occurrence model information
Nearby scientific data
Economic information about the deposit and operations
Mining district
Links to other databases
Bibliographic references
General comments
Reporter information

Geologic information

Identification information

Deposit ID	10308449
Record type	Site
Current site name	Unnamed (near Round Mtn)

Geographic coordinates

Geographic coordinates:	-152.68279, 62.03949 (WGS84)
Relative position	Alaska Department of Natural Resources unpublished claim records show this locality, about one mile south of Round Mountain, to cover an approximately one square mile area in Section 25, T. 23 N., R. 19 W., of the Seward Meridian and adjacent Sections 35 and 36, in T. 22 N., R. 19 W., of the Seward Meridian. Coordinates are given for poorly exposed part of the prospect in Section 35. Exposures in Section 25 are in a canyon, easily seen from the air.

Geographic coordinates:

-152.68279, 62.03949 (WGS84)

Relative position

Alaska Department of Natural Resources unpublished claim records show this locality, about one mile south of Round Mountain, to cover an approximately one square mile area in Section 25, T. 23 N., R. 19 W., of the Seward Meridian and adjacent Sections 35 and 36, in T. 22 N., R. 19 W., of the Seward Meridian. Coordinates are given for poorly exposed part of the prospect in Section 35. Exposures in Section 25 are in a canyon, easily seen from the air.

Site location context

Political divisions (FIPS codes)

Matanuska-Susitna(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Talkeetna A-6(quadrangle 1:63,360 scale)

Talkeetna SW(quadrangle 1:100,000 scale)

Talkeetna(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Yentna River(hydrologic unit)

Susitna River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country	State
United States	Alaska

Commodities

Commodity	Importance
Silver	Primary
Gold	Primary
Lead	Primary
Zinc Critical	Primary
Arsenic Critical	Secondary
Antimony Critical	Secondary

Materials information

Materials	Type of material
Arsenopyrite	Ore
Chalcopyrite	Ore
Galena	Ore
Pyrite	Ore
Pyrrhotite	Ore
Sphalerite	Ore
Stibnite	Ore
Quartz	Gangue
Sericite	Gangue

Alteration

(Local) Quartz-sericite-pyrite, quartz-pyrite, carbonate, and magnetite alteration.

Mineral occurrence model information

Model code	85
USGS model code	22c
Deposit model name	Polymetallic veins
Mark3 model number	46

Nearby scientific data

(1)	-152.68279, 62.03949	ListMap

Economic information

Comments on the geologic information

Geologic Description = Mesozoic marine sedimentary rocks (KJs) and (or) undivided Tertiary tuff and tuffaceous sedimentary rocks (Tvs) mapped by (Reed and Nelson, 1980) are intruded by intermediate to mafic sills, dikes and small plugs (Cominco American Incorporated, unpublished report). The intrusive rocks are overprinted by quartz-sericite-pyrite and magnetite-carbonate alteration. Auriferous veins, pods and stockwork which contain variable amounts of pyrite, pyrrhotite, sphalerite, galena and quartz ,+/-chalcopyrite, stibnite and arsenopyrite are concentrated along intrusive contacts and structures. Geochemical values in rock chip samples range from several hundred ppb gold to just under an ounce per ton gold in select high grade samples. Silver values up to about an ounce per ton is recorded select samples (Cominco American Incorporated, unpublished report).
Age = Early or middle Tertiary; mineralization is interpreted to be linked to the Tvs, which Reed and Nelson (1980) relate to plutonism of the same age in this part of the Alaska Range.

Economic information about the deposit and operations

Development status	Prospect

Comments on exploration

Status = Inactive

Mining district

District name	Yentna

Comments on the workings information

Workings / Exploration = Prospecting, silt, soil and rock chip geochemistry, magnetic and VLF geophysical survey, and mapping at 1:12,000 scale by Cominco American Incorporated in the late 1980s. Geochemical values in rock chip samples range from several hundred ppb gold to just under an ounce per ton gold in select high grade samples. Silver values up to about an ounce per ton is recorded select samples (Cominco American Incorporated, unpublished report).

Reference information

Links to other databases

Agency	Database name	Acronym	Record ID	Notes
USGS	Alaska Resource Data File	ARDF	TL064

Bibliographic references

Deposit

Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle: U.S. Geological Survey Miscellaneous Investigations Map I-1174, scale 1:250,000.

Comments on the references

Primary Reference = This record

General comments

Subject category	Comment text
Deposit	Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c).
Deposit	Other Comments = Rock exposures at this site are limited to stream cuts.

Reporter information

Type	Date	Name	Affiliation	Comment
Reporter	10-AUG-98	Madelyn A. Millholland	Millholland & Associates

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.