Unnamed Near Round Point

Unknown in Alaska, United States with commodities Copper, Lead, Zinc

Sections on this page

Identification information
Geographic coordinates
Site location context
Geographic areas
Commodities
Mineral occurrence model information
Nearby scientific data
Ore body information
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	10111311
MRDS ID	A106409
Record type	Site
Current site name	Unnamed Near Round Point

Geographic coordinates

Geographic coordinates:	-132.70463, 56.27946 (WGS84)
Relative position	SEE LOCATION COMMENTS

Site location context

Political divisions (FIPS codes)

Wade Hampton(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Petersburg B-3(quadrangle 1:63,360 scale)

Petersburg S(quadrangle 1:100,000 scale)

Petersburg(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Central Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country	State
United States	Alaska

Comments on the location information

AS ORIGINALLY REPORTED BY GRYBECK, BERG, AND KARL (1984), THIS SITE IS BASED ON A SHORT EXAMINATION BY THE REPORTERS AND AN INDUSTRY GEOLOGIST WHO WAS WORKING FROM A SMALL CAMP NEARBY. THE SPECIFIC SITE THAT WAS VISITED WAS AN EXPOSURE IN A SMALL CREEK BED IN ABOUT THE CENTER OF SECTION 36, T. 64 S., R. 81 E., BUT MINERALIZED OUTCROPS WERE REPORTED TO BE MORE EXTENSIVE IN THE VICINITY.

Commodities

Commodity	Importance
Copper	Primary
Lead	Primary
Zinc Critical	Primary

Mineral occurrence model information

Model code	184
USGS model code	28a
Deposit model name	Massive sulfide, kuroko
Mark3 model number	93

Nearby scientific data

(1)	-132.70463, 56.27946	ListMap

Economic information

Ore body information

General form SEE DEPOSIT DESCRIPTION COMMENTS

General form	SEE DEPOSIT DESCRIPTION COMMENTS

Economic information about the deposit and operations

Commodity type	Metallic
Significant	No

Mining district

District name	Ketchikan

Comments on the production information

NONE

Comments on the workings information

SITE WAS ORIGINALLY DEFINED IN 1984 BY GRYBECK, BERG, AND KARL ON THE BASIS OF A BRIEF VISIT TO AN INDUSTRY EXPLORATION CAMP NEARBY. HOWEVER, EXPLORATION WAS MORE WIDESPREAD THAN JUST THE OCCURRENCE THAT THE USGS VISITED AND THERE MAY HAVE BEEN SOME DRILLING ON THE PROPERTY. HOWEVER, THERE IS LITTLE INDICATION THAT MAJOR SURFACE EXPLORATION CONTINUED IN THIS AREA MUCH BEYOND THE MID-80'S, ALTHOUGH THE AREA MAY WELL HAVE BEEN FURTHER EXAMINED BY INDUSTRY SINCE.

Reference information

Links to other databases

Agency	Database name	Acronym	Record ID	Notes
USGS	Mineral Resources Data System	MRDS	A106409
USGS	Alaska Resource Data File	ARDF	PE063

Bibliographic references

Deposit

Berg, H. C., and Grybeck, Donald, 1980, Upper Triassic volcanogenic Zn-Pb-Ag (-Cu-Au) mineral deposits near Pertersburg, Alaska: U.S. Geological Survey Open-File Report 80-527, 11 p., 1 oversize sheet.
Deposit

Grybeck, D. J., Berg, H. C., and Karl, S. M., 1984, Map and description of the mineral deposits in the Petersburg and eastern Port Alexander quadrangles: U.S. Geological Survey Open-File Report 84-837, 86 p., 1 sheet, scale 1:250,000.

General comments

Subject category	Comment text
Deposit	THE MINERALIZED EXPOSURE CONSISTS OF RUSTY-WEATHERING, LIGHT GREEN-GRAY FELSIC METAVOLCANIC ROCKS WITH SMALL LENSES, PODS, AND LAYERS UP TO A FOOT THICK THAT CONTAIN DISSEMINATED SULFIDES, MAINLY PYRITE AND POSSIBLY SPHALERITE AND CHALCOPYRITE. ANALYSES OF GRAB SAMPLES SHOW LESS THAN 5 PPM CU, 50-150 PPM PB, 200-11,000 ZN, AND 150-5,000 BA. THE FELSIC METAVOLCANIC ROCKS ARE INTERBEDDED WITH LIGHT GRAY, SILICIFIED LIMESTONE AND DARK GRAY ARGILLITE. RECENT GEOLOGIC MAPPING IN THE AREA (S. KARL, ORAL COMMUNICATION, 1998) INDICATES THAT THE ROCKS IN WHICH THE SULFIDES OCCURS ARE PROBABLY PART OF THE TRIASSIC HYD GROUP. THE SITE MARKED THE SOUTHERN END OF THE DUNCAN CANAL-ZAREMBO BELT OF TRIASSIC VOLCANOGENIC MASSIVE-SULFIDE MINERALIZATION AS ORIGINALLY DEFINED BY BERG AND GRYBECK IN 1980.

Subject category

Comment text

Deposit

THE MINERALIZED EXPOSURE CONSISTS OF RUSTY-WEATHERING, LIGHT GREEN-GRAY FELSIC METAVOLCANIC ROCKS WITH SMALL LENSES, PODS, AND LAYERS UP TO A FOOT THICK THAT CONTAIN DISSEMINATED SULFIDES, MAINLY PYRITE AND POSSIBLY SPHALERITE AND CHALCOPYRITE. ANALYSES OF GRAB SAMPLES SHOW LESS THAN 5 PPM CU, 50-150 PPM PB, 200-11,000 ZN, AND 150-5,000 BA. THE FELSIC METAVOLCANIC ROCKS ARE INTERBEDDED WITH LIGHT GRAY, SILICIFIED LIMESTONE AND DARK GRAY ARGILLITE. RECENT GEOLOGIC MAPPING IN THE AREA (S. KARL, ORAL COMMUNICATION, 1998) INDICATES THAT THE ROCKS IN WHICH THE SULFIDES OCCURS ARE PROBABLY PART OF THE TRIASSIC HYD GROUP. THE SITE MARKED THE SOUTHERN END OF THE DUNCAN CANAL-ZAREMBO BELT OF TRIASSIC VOLCANOGENIC MASSIVE-SULFIDE MINERALIZATION AS ORIGINALLY DEFINED BY BERG AND GRYBECK IN 1980.

Reporter information

Type	Date	Name	Affiliation	Comment
Reporter	01-NOV-1998	Berg, H. C. (Grybeck, D. J.)	U.S. Geological Survey

Beyond USGS

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

Maps centered on this site

Authoritative Alaska resources

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