Antoro Mine

The Antoro Mine is a silver, copper, zinc, and lead mine located in Saguache county, Colorado at an elevation of 11,266 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

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Site Name

Primary: Antoro Mine

Commodity

Primary: Silver
Primary: Copper
Primary: Zinc
Primary: Lead
Secondary: Gold

Location

State: Colorado
County: Saguache
District: Bonanza (Kerber Creek)

Land Status

Land ownership: Private
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

Type: Underground

Ownership

Owner Name: Superior Mines Division
Home Office: Salida, Co.
Years: 1959 -

Owner Name: American Industrial Leasing Co.
Home Office: Chicago, Il.
Years: 1959 -

Production

Year: 1959
Material type: ORE PB AG
Description: Ap_Grade: ^0.01 Oz/Ton Au, 1.7 Oz/Ton Ag, 5% Pb, 6.3% Zn

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1882
Year Last Production: 1959
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains

Mineral Deposit Model

Not available

Orebody

Form: IRREGULAR

Structure

Type: R
Description: Sawatch Range, San Juan Volcanic Field, Rio Grande Rift

Type: L
Description: Bonanza Caldera

Alterations

Alteration Type: L
Alteration Text: Early Barren Stage Of Alteration By Fumarolic Or Acid-Hot Spring Activity Resulted In Intense Silicification, Wallrock Replacement By Jasper And Alteration Products Hematite, Diaspore, Alunite, Barite, Zunyite, Rutile, And Kaolin Minerals. Later Mineralizing Stage By Alkaline Or Neutral Solutions Deposited Ore And Gangue And Caused Micaceous Alteration (Sericite And Chlorite) And Calcite, Quartz, And Pyrite.

Rocks

Name: Andesite
Role: Associated
Age Type: Host Rock Unit
Age Young: Oligocene

Name: Andesite
Role: Associated
Age Type: Associated Rock
Age Young: Oligocene

Name: Andesite
Role: Associated
Age Type: Host Rock
Age Young: Oligocene

Name: Andesite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Oligocene

Analytical Data

Analytical Data: ZINC VEIN ASSAY AVERAGES 8 % PB, 13 % ZN, TRACE CU, 1 TO 9 OZ/TON AG, 19 % FE. POVERTY VEIN SAMPLE ASSAYED 8.5 TO 25 % PB, 2.4 TO 6 % ZN, 0.2 TO 5 % CU, 3 TO 7 OZ/TON AG, 7 TO 11 % FE. A 730-TON ORE SHIPMENT FROM POVERTY VEIN CONTAINED AVERAGE 32.3 % PB, 0.6 % CU, 8.9 OZ/TON AG, 0.012 OZ/TON AU, UP TO 4 % ZN. 2.5-FT SAMPLE IN ANTORO VEIN CARRIED 5.5 OZ/TON AG, 8 % PB, 8 % ZN, TRACE TO 1.8 % CU, UP TO 0.02 OZ/TON AU. 3.5-FT SAMPLE CARRIED 6.5 OZ/TON AG, 18 % PB, 8.3 % ZN. 1.6-FT VEIN CARRIED 4 OZ/TON AG, 9 % PB, 9 % ZN, 0.5 % CU. 1.5-FT VEIN AT NW END'S SPLIT CARRIED 8 OZ/TON AG, 15 % PB, 7.5 % ZN

Materials

Ore: Chalcopyrite
Ore: Chalcocite
Ore: Sphalerite
Ore: Pyrite
Ore: Tennantite
Gangue: Quartz
Gangue: Barite
Gangue: Calcite

Comments

Comment (Workings): MINE DEVELOPED BY MAIN TUNNEL, SEVERAL DRIFTS, SHAFT WITH INCLINED RAISE. TUNNEL DRIVEN DUE NORTH FOR 70 FT, THENCE N8 TO 28E FOR 750 FT. AT 90 FT PAST FIRST BEND, 125-FT WINZE SUNK ON NORTHEAST VEIN; AT 310 FT PAST BEND, 130-FT CROSSCUT DRIVEN EASTWARD AND 140-FT DRIFT DEVELOPED ON SECOND SEGMENT OF NORTHEAST VEIN. AT 750 FT FROM PORTAL, 260-FT CROSSCUT DRIVEN NE AND EAST AND 170-FT DRIFT DEVELOPED ON ZINC VEIN. MAIN TUNNEL CONTINUES IRREGULARLY FROM N25W TO N15E FOR 530 FT TO INTERSECT POVERTY VEIN AND ADDITIONAL 80 FT TO ANTORO VEIN. POVERTY VEIN DRIFT EXTENDS 360 FT WEST OF TUNNEL AT N60W AND 300 FT GENERALLY EASTWARD EAST OF TUNNEL. LOWEST OR PORTAL LEVEL OF ANTORO VEIN WORKINGS INTERSECTS EAST POVERTY VEIN DRIFT 90 FT EAST ON DRIFT. TUNNEL LEVEL CONTINUES ALONG ANTORO VEIN AT N17 TO 25W FOR 100 FT TO FACE (VEIN PINCHOUT). ANTORO SHAFT AND 550-FT INCLINED RAISE LOCATED 1380 FT N8E FROM PORTAL. ANTORO VEIN DEVELOPED BY MINOR LEVEL AT 100 FT DEPTH. 114 AND 200 LEVELS MEASURED (IN

Comment (Workings): FEET) ABOVE TUNNEL LEVEL. 200 LEVEL HAS 95 FT OF DRIFT NORTH OF SHAFT. ON 114 LEVEL, SOUTH DRIFT IS 120 FT LONG WITH RAISE AT 75 FT; NORTH DRIFT IS 280 FT LONG WITH RAISE AT 155 FT. ON TUNNEL LEVEL,

Comment (Deposit): MINE DEVELOPED ON FOUR NE- AND NW-TRENDING VEINS (FROM SOUTH TO NORTH): NORTHEAST VEIN, ZINC VEIN, POVERTY VEIN, AND ANTORO VEIN. NORTHEAST VEIN STRIKES N30E, DIPS VERTICALLY, AND IS PROBABLE EXTENSION OF RAWLEY VEIN; REPORTEDLY 18 INCHES WIDE AT BOTTOM OF WINZE FROM ANTORO PORTAL LEVEL; SHOWS CU AND AG VALUES. ZINC VEIN TRENDS NORTH TO NORTHEAST (ARCUATE), DIPPING 65E, 1 TO 4 FT THICK (AVE. 2 FT), TERMINATED ON SOUTH BY CROSS FAULT TRENDING N85E, 70SE, CARRIES VALVES IN PB, AG, AND AU, WITH TRACE OF CU, BUT HIGH ZN AND FE CONTENTS DISCOURAGED SIGNIFICANT DEVELOPMENT. POVERTY VEIN TRENDS N65W, 28 TO 35 NE AND IS CONCAVE NORTH-EASTWARD TOWARD ANTORO VEIN. ALTHO HEAVILY GOUGED AND IN PLACES STRONGLY BRECCIATED, MINERALIZATION IS IRREGULAR, WITH VALVES MAINLY IN PB, AG, ZN, SOME CU, A LITTLE AU. ANTORO VEIN IRREGULARLY TRENDS N25W; 65 TO 85NE, UP TO 3 FT WIDE. NW END OF VEIN SPLITS INTO TWO VEINS THAT TERMINATE AGAINST CROSS FAULT TRENDING N45W, 80 SW; OXIDIZED ORES EXTEND TO DEPTH OF

Comment (Deposit): 120 FT; VALVES ARE MAINLY PB, AG, AND ZN WITH LOW CU AND AU.

Comment (Location): S-T-R, LAT-LONG, AND ELEV. TAKEN FROM BURBANK'S (1932) PLATE 1 (SCALE 1:12000). MINE OR CLAIM LIES ON NORTH SIDE OF RAWLEY GULCH EAST OF RAWLEY ADIT ; INFO FROM LAND.ST :1976

References

Reference (Deposit): BURBANK, W.S., 1932, GEOLOGY AND ORE DEPOSITS OF THE BONANZA MINING DISTRICT, COLORADO: USGS PROF. PAPER 169, 166 P.

Reference (Production): COLO. DIV. MINES ANNUAL OPERATOR REPTS.

Reference (Deposit): PATTON, H.B., 1916, GEOLOGY AND ORE DEPOSITS OF THE BONANZA DISTRICT, SAGUACHE COUNTY, COLORADO: COLORADO GEOLOGICAL SURVEY BULL. 9, 136 P.

Colorado Mining Photos

Check out this collection of Colorado's best historic mining photos: Incredible Photos of Colorado Mining Scenes.