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Antoro Mine

Past Producer in Saguache county in Colorado, United States with commodities Lead, Silver, Copper, Zinc, Gold
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Ownership information
  18. Production statistics
  19. Workings at the site
  20. Links to other databases
  21. Bibliographic references
  22. General comments
  23. Reporter information

Geologic information

Identification information

Deposit ID 10101784
MRDS ID D009178
Record type Site
Current site name Antoro Mine
Related records 10289013

Geographic coordinates

Geographic coordinates: -106.12504, 38.32668 (WGS84)
Elevation 3434
Relative position 16.2 MILES N 03 E FROM SAGUACHE

Site location context

Political divisions (FIPS codes)

Saguache(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bonanza(quadrangle 1:24,000 scale)

Saguache(quadrangle 1:100,000 scale)

Montrose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

San Luis(hydrologic unit)

Rio Grande Headwaters(hydrologic accounting unit)

Rio Grande Headwaters(hydrologic subregion)

Rio Grande(hydrologic region)

Federal lands

Rio Grande National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Colorado Saguache

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 047N 008E 18 NE OF NW OF SE Colorado

Comments on the location information

  • 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

Commodities

Commodity Importance
Lead Primary
Silver Primary
Copper Primary
Zinc Critical Primary
Gold Secondary

Materials information

Materials Type of material
Chalcocite Ore
Chalcopyrite Ore
Pyrite Ore
Sphalerite Ore
Tennantite Ore
Barite Gangue
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) 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.

Analytical data

Result 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

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Rawley Andesite
    Rock description Rawley Andesite
    Stratigraphic age (youngest) Oligocene
    Stratigraphic age (youngest) Oligocene
    Stratigraphic age (youngest) Oligocene
    Stratigraphic age (youngest) Oligocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Rawley Andesite
    Rock description Rawley Andesite

Nearby scientific data

(1) -106.12504, 38.32668
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Sawatch Range, San Juan Volcanic Field, Rio Grande Rift
Type of structure Local
Structure description Bonanza Caldera

Ore body information

  • General form IRREGULAR
    Thickness 0.91M

Controls for ore emplacement

  • See Comments

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1882
Year of last production 1959

Mining district

District name Bonanza (Kerber Creek)

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Superior Mines Division
    Home office Salida, Co.
    First year 1959
  • Type Owner
    Owner American Industrial Leasing Co.
    Home office Chicago, Il.
    First year 1959

Production statistics

  • Year 1959
    Material ORE PB AG
    Accuracy Accurate
    Description Ap_Grade: ^0.01 Oz/Ton Au, 1.7 Oz/Ton Ag, 5% Pb, 6.3% Zn
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Zinc Zinc 6wt-pct
    Major Lead Lead 5wt-pct
    Major Ore Silver Silver 48g/mt
    Minor Ore Gold Gold 0g/mt

Workings at the site

  • Type of workings Underground
    Area 11.332HA
    Length 1594.1M
    Overall length 509.02M
    Overall width 222.5M

Comments on the workings information

  • 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
  • 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,

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

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

  • Production

    COLO. DIV. MINES ANNUAL OPERATOR REPTS.

General comments

Subject category Comment text
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
Deposit 120 FT; VALVES ARE MAINLY PB, AG, AND ZN WITH LOW CU AND AU.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1982 Schwochow, Stephen D. Colorado Geological Survey

Beyond USGS

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

External references

Maps centered on this site

Authoritative Colorado resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.