Midas Mine

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

Satelite View

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.

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

The Top Ten Gold Producing States

These ten states contributed the most to the gold production that built the West from 1848 through the 1930s. The Top Ten Gold Producing States.