The Sweetheart Ridge Gold-Copper-Silver Prospect is a copper and gold mine located in Alaska at an elevation of 2,871 feet.
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
Elevation: 2,871 Feet (875 Meters)
Commodity: Copper, Gold
Lat, Long: 57.92389, -133.62222
Map: View on Google Maps
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Sweetheart Ridge Gold-Copper-Silver Prospect MRDS details
Site Name
Primary: Sweetheart Ridge Gold-Copper-Silver Prospect
Secondary: Elephant
Secondary: Mastadon
Secondary: Readgister
Secondary: Golden Gate Claims
Commodity
Primary: Copper
Primary: Gold
Secondary: Silver
Secondary: Lead
Secondary: Zinc
Location
State: Alaska
District: Juneau
Land Status
Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Mapco
Years: 1982 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
Not available
Mineral Deposit Model
Not available
Orebody
Form: POD
Structure
Type: L
Description: Nw Striking, Steep Dipping Foliation Of Schist And Gneiss
Alterations
Not available
Rocks
Not available
Analytical Data
Analytical Data: CHANNEL, CHIP SAMPLES UP TO 0.577 OZ/TON AU, 2.6% CU, 0.65 OZ/TON AG, 1.8% PB, 1.9% ZN
Materials
Ore: Sphalerite
Ore: Gold
Ore: Chalcopyrite
Gangue: Garnet
Gangue: Quartz
Gangue: Muscovite
Gangue: Epidote
Gangue: Biotite
Gangue: Pyrite
Gangue: Hornblende
Gangue: Goethite
Gangue: Chlorite
Comments
Comment (Deposit): THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.
Comment (Deposit): STRATIFORM SULFIDE BODY IN MICA SCHIST BELT WITHIN GREENSCHIST. IRON-STAINED MINERALIZED ZONE IS LAYERED AND GRADES FROM PHYLLITE TO SCHIST TO QUARTZ-RICH GNEISS. SULFIDES ARE DISSEMINATED AND IN THIN LAYERS, CONSISTING LARGELY OF CHALCOPYRITE, PYRITE, OCCASIONAL SPHALERITE, AND RARELY GALENA. DISSEMINATED PYRITE AND CHALCOPYRITE ARE CONCENTRATED IN LAYERS WITHIN ZONE THAT ALIGNS WITH FOLIATION. MINERALIZED ZONE EXTENDS AT LEAST 2000 FT., NW-SE. CHALCOPYRITE STRINGERS FOUND IN ZONE 10,000 FT. LONG BY 200 FT. WIDE. SEVERAL MASSIVE SULFIDE PODS UP TO 8 IN. WIDE AND 6 FT. LONG ARE FOUND IN AREA A FEW HUNDRED FT. LONG. PODS CONTAIN ABUNDANT SPHALERITE, CHALCOPYRITE, PYRITE AND GALENA. MOST IMPORTANT MINERALIZED BAND IS IN WEST-CENTRAL SECTION, CONSISTING OF CATACLASTIC QUARTZ-RICH GNEISS 5-6 FT. THICK WITH STRIKE LENGTH OF 147 FT., CAPPED BY INTENSE ORANGE-RED IRON STAIN.
Comment (Commodity): ANALYTICAL DATA FROM USGS B 1525, P. 175, 286-289, TABLE 26.
Comment (Deposit): FIELD AND PETROGRAPHIC EXAMINATION SUGGEST THAT DEPOSIT IS POSSIBLY OF SEDIMENTARY ORIGIN. IF SO, PERSISTENCE OF METALLIC MINERALIZATION ALONG STRIKE AND DOWN DIP MIGHT BE EXPECTED. ; INFO.SRC : 1 PUB LIT
Comment (Reserve-Resource): ZONE OF HIGHEST GRADE MINERALIZATION, 147 FT. LONG AND 5.5 FT. WIDE CONTAINS ESTIMATED AVERAGE TONNAGE OF 7,300 TONS PER 100 FT. DEPTH AT AVERAGE GRADE OF 0.23 OZ/TON AU, 0.31 OZ/TON AG, AND 0.7% CU, ACCORDING TO USGS B 1525, P. 173.
Comment (Development): DISCOVERED AND CLAIMS STAKED AS EARLY AS LATE 1890'S. REDISCOVERED BY USBM IN 1974. EXTENSIVE DIAMOND DRILLING, GEOPHYSICAL EXPLORATION BY MAPCO FROM 1978-1982, BUT NO MAJOR WORK SINCE THEN.
Comment (Workings): NUMEROUS SURFACE-SAMPLING TRENCHES CUT BY USBM IN 1975, SEVERAL THOUSAND FT. OF DIAMOND DRILLING HOLES BY MAPCO IN 1978-82.
Comment (Geology): DEPOSIT ALONG 5.5 MI. LONG LINEAR DEPRESSION FROM TRACY ARM TO SWEETHEART LAKE, APPARENTLY CAUSED BY DIFFERENTIAL WEATHERING OF CHLORITE SCHIST, WHICH SEPARATES E AND W PARTS OF DEPOSIT.
Comment (Location): USGS B 1525, FIG. 59, 61, 63, SAMPLE 90. LOCATION IS AT SITE OF SECTION OF BEST MINERALIZATION. MINERALIZED AREA EXTENDS AT LEAST 1,000 FT. N AND S AND 200 FT. E AND W OF LOCATION. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).
References
Reference (Deposit): USGS B 1525, P. 169-175, TABLE 26, FIGS. 59-63 (1984)
Reference (Deposit): USBM OFR 85-86, P. 47-48, FIG. 4, LOC. 161 (1986)
Reference (Deposit): USGS OF 78-698, P. 33 (1978)
Reference (Other Database): BAG-B-1525-FIG-59, 61, 63
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