The Midas Mine is a copper 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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MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Midas Mine MRDS details
Site Name
Primary: Midas Mine
Secondary: Granby Consolidated Mining, Smelting and Power Co.
Secondary: Orebodies: Jumbo Lode, All-American
Commodity
Primary: Copper
Secondary: Gold
Secondary: Silver
Tertiary: Zinc
Tertiary: Lead
Location
State: Alaska
District: Port Valdez
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Year: 1918
Year: 1917
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1912
Year Last Production: 1919
Discovery Year: 1901
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
Not available
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Type: R
Description: Shear Zones Developed In Slate Country Rock That Has Been Folded Against Graywacke
Type: L
Description: N-S Fault Runs About 1000 Ft W Of Mine, May Cut Off Ore Body; Minordrag Folds Suggest Anticline To The S
Alterations
Not available
Rocks
Name: Greenstone
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Cretaceous
Name: Greenstone
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous
Analytical Data
Analytical Data: DATA FROM ADGGS GR 15, TABLE I, P. 10
Analytical Data: 0.8% CU, 0.9% ZN, 0.05% PB, 0.03 OZ/TON AU, 0.03 OZ/TON AG, CHIP SAMPLE ACROSS 3 FT ZONE OF MINERALIZATION, ALL-AMERICAN LODE
Analytical Data: 3.4% CU, 4.2% ZN, LESS THAN 0.1% PB, 0.15 OZ/TON AU, 1.46 OZ/TON AG, CHIP SAMPLE ACROSS 3 FT MASSIVE SULFIDE VEIN, JUMBO LODE
Materials
Ore: Chalcopyrite
Ore: Pyrrhotite
Ore: Sphalerite
Ore: Galena
Gangue: Quartz
Gangue: Calcite
Unknown: Pyrite
Comments
Comment (Deposit): ONLY COPPER MINE IN VALDEZ QUAD. WITH ANY SIGNIFICANT PRODUCTION; SOME RESERVES REMAIN IN JUMBO LODE, AND VERY LITTLE WORK HAS BEEN DONE ON ALL-AMERICAN LODE TO DATE; ACTIVE CLAIMS AND EXPLORATION REPORTED IN 1982; TWO SMALL OCCURRENCES OF CHALMERSITE REPORTED IN SOLOMON GULCH, BUT NOT AT MIDAS ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT
Comment (Commodity): THE MASSIVE SULFIDE ORE COMMONLY RUNS 3.0 TO 3.5% CU, VARIABLE ZN AND AG, AND LOW TO MODERATE AU; ADGGS GR15
Comment (Production): FIRST ORE SHIPMENT IN 1911 OR 1912, REGULAR SHIPMENTS BETWEEN 1914 AND 1919; ORE WAS SHIPPED TO GRANBY CONSOLIDATED SMELTER AT ANYOX, BRITISH COLUMBIA AND TO TACOMA SMELTING COMPANY IN TACOMA, WASHINGTON
Comment (Development): 15 PATENTED LODE CLAIMS AND 2 MILL SITES; ALL-AMERICAN LODE STAKEDIN 1901, DEVELOPED IN 1905 BY SHALLOW SHAFT; JUMBO LODE STAKED IN 1906,DEVELOPMENT BEGAN 1911, MAJOR UNDERGROUND WORK FROM 1913 TO SEP. 1918, SOME DIAMOND DRILLING AFTER THAT; 1982 REPORT OF RECENT EXPLORATION ACTIVITY
Comment (Location): LOCATION GIVEN ON VALDEZ A-7 QUADRANGLE AS MIDAS MINE IS JUMBO LODE, COORDINATES GIVEN ABOVE; THE ALL AMERICAN LODE IS PLOTTED AS A MINE SHAFT SYMBOL ABOUT 1/2 MI SE OF MIDAS ADIT SYMBOL LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991). ; INFO FROM LAND.ST :49?
Comment (Workings): JUMBO LODE: 4000 FT OF UNDERGROUND WORKINGS IN 4 INTERCONNECTED TUNNELS EACH BETWEEN 500 AND 900 FT LONG WITH 290 FT VERTICAL SEPARATION BETWEEN LOWEST AND HIGHEST TUNNEL, ALL BUT ONE CAVED BY 1964; ALL-AMERICAN LODE: OPEN CUTS AND SHALLOW SHAFT, CAVED BY 1964; SURFACE IMPROVEMENTS INCLUDED 5 1/4 MI AERIAL TRAM AND ORE BUNKERS; IN RUINS BY 1943
Comment (Geology): COUNTRY ROCK DOMINANTLY SLATES INTRUDED BY SILLS AND DIKES OF GREENSTONE; GREENSTONE BODY S OF MINE HAS EXPOSED DIMENSIONS OF 300 BY 1200 FT; AREA HAS BEEN METAMORPHOSED TO QUARTZ-ALBITE-EPIDOTE-BIOTITE SUBFACIES OF GREENSCHIST. BLACK SLATES INTERBEDDED WITH ARGILLITES, CHERTS, GRAYWACKE AND QUARTZITES. INTERBEDDED FLYSHOID SEDIMENTS DOMINATED BY BLACK SLATE. SCHISTOSE GREENSTONE (APPARENTLY AN ALTERED MAFIC-RICH GABBRO). GREENSTONE COMPOSED OF 70% ACTINOLITE AND 25% PLAGIOCLASE, AN60.
Comment (Deposit): CRUDELY STRATIFORM MASSIVE VEIN AND DISSEMINATED PYRITE-PYRRHOTITE-CHALCOPYRITE-SPHALERITE REPLACEMENT DEPOSITS; LOCALLY REMOBILIZED AND ENRICHED ALONG FRACTURES TO FORM CROSSCUTTING POLYMETALLIC SULFIDE-BEARING QUARTZ-CALCITE VEINS AND FRACTURE FILLINGS; GENERALLY RESTRICTED TOSHEAR ZONES STRIKING N 75 W TO S 62 W AND DIPPING 40-70 N; JUMBO LODE RANGED FROM A FEW IN TO 20 FT WIDE, AVERAGING 3 TO 4 FT OF ORE IN SHEAR ZONE ABOUT 1000 FT LONG; ALL-AMERICAN LODE IS WIDER BUT LOWER GRADE
References
Reference (Deposit): ADGGS SR 31, LOC. 146
Reference (Other Database): BAG-OFR-80-892B-32
Reference (Production): USBM BULL 153, P. 47 AND ADGGS GR 15, P. 7
Reference (Deposit): USGS BULL 622, P. 151-153, 156-157, 187-188
Reference (Deposit): USBM BULL 142, P. 38, 40
Reference (Deposit): USBM BULL 153, P. 46-47
Reference (Deposit): USGS BULL 692, P. 164-166, 168-171
Reference (Deposit): ADGGS GR 15, P. 1, 5-12, 19
Reference (Deposit): USBM IC 8626, P. 21
Reference (Deposit): USGS OFR 80-892B, LOC. 32
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