| Deposit ID | 10013776 |
|---|---|
| MRDS ID | D010253 |
| Record type | Site |
| Current site name | Colorado-American Mine |
| Alternate or previous names | American Shaft, Trefone Adit or Tunnel, Mill Adit, Kramer Adit, American Fluorspar Co. Mine, Colorado Fluorspar Co. Mine, Browns Canyon Deposit, Arkansas Claim, Bapp (Bopp) Mine, Browns Canyon or Dostal Mine |
| Related records | 10190307 |
| Geographic coordinates: | -106.06671, 38.6325 (WGS84) |
|---|---|
| Elevation | 2353 |
| Location accuracy | 100(meters) |
| Relative position | 7.8 MILES S 04 E OF NATHROP |
Political divisions (FIPS codes)
Chaffee(county)
Colorado(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Nathrop(quadrangle 1:24,000 scale)
Gunnison(quadrangle 1:100,000 scale)
Montrose(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Arkansas Headwaters(hydrologic unit)
Upper Arkansas(hydrologic accounting unit)
Upper Arkansas(hydrologic subregion)
Arkansas-White-Red(hydrologic region)
| Country | State | County |
|---|---|---|
| United States | Colorado | Chaffee |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| New Mexico | 051N | 008E | 34 | NE OF SW OF NE | Colorado |
| Materials | Type of material |
|---|---|
| Fluorite | Ore |
| Barite | Gangue |
| Calcite | Gangue |
| Goethite | Gangue |
| Hematite | Gangue |
| Kaolinite | Gangue |
| Manganite | Gangue |
| Montmorillonite | Gangue |
| Opal | Gangue |
| Psilomelane | Gangue |
| Pyrite | Gangue |
| Pyrolusite | Gangue |
| Quartz | Gangue |
| Result | EAST VEIN AVERAGES 50% CAF2, WITH LARGE POCKETS AVERAGING 75% CAF2 |
|---|
| Model code | 174 |
|---|---|
| USGS model code | 26b |
| Deposit model name | Fluorspar deposits (fluorite veins) |
| Host or associated | Associated | ||||
|---|---|---|---|---|---|
| Rock type | Metamorphic Rock > Gneiss | ||||
| |||||
| Host or associated | Associated |
|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite |
| Rock unit name | Gneissic Quartz Monzonite;Ash-Flow Tuff |
| Rock description | Gneissic Quartz Monzonite;Ash-Flow Tuff |
| Host or associated | Host |
|---|---|
| Rock type | Metamorphic Rock > Gneiss |
| Rock unit name | Banded Gneiss |
| Rock description | Banded Gneiss |
| Host or associated | Host |
|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite |
| (1) | -106.06671, 38.6325 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Southern Mosquito Range, Arkansas Valley Graben |
| Type of structure | Local |
| Structure description | Folds, Faults; N-Trending Fault Bounding Arkansas Valley; At 100-Ft Level Of Mine Workings Expose Fault With Welded Tuff On One Side, Quartz Monzonite On Other Side |
| General form | TABULAR, LENTICULAR, POD-LIKE |
|---|---|
| Thickness | 137.16M |
| Length | 688.85M |
| Width | 4.57M |
| Depth to bottom | 137.16M |
| Development status | Past Producer |
|---|---|
| Commodity type | Both |
| Deposit size | Medium |
| Significant | No |
| Discovery year | 1923 |
| Discoverer | Stephen Trefone? |
| Year of first production | 1927 |
| Year of last production | 1949 |
| District name | Browns Canyon District |
|---|
| Ownership category | Private |
|---|
| Type | Owner |
|---|---|
| Owner | Allied Chemical Corp., General Chemical Division |
| First year | 1969 |
| Year | 1948 |
|---|---|
| Period | 1930-1948 |
| Material | FLUORSPAR CONCENTRATES |
| Ore mined | 115151.4mt |
| Accuracy | Estimate |
| Description | Cp_Grade: ^50% Caf2 |
| Type of workings | Surface/Underground |
|---|---|
| Area | 13.121HA |
| Length | 1828.8M |
| Overall depth | 137.16M |
| Overall length | 633.98M |
| Overall width | 219.46M |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | D010253 | |
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0080150281 |
BRADY, B. T., 1975, MAP SHOWING FLOORSPAR DEPOSITS IN COLORADO: USGS MAP MR-70, 1:500,000, TEXT
VAN ALSTINE, R. E. (1969)
MINE MAP REPO # 404957
MICROFILM DOCUMENT 2565: MINERAL DEPOSITS BRANCH IN LIBRARY
CONSV. DIV. COMP. DATE, 1,64
USGS TOPO MAPS ARKANSAS RIVER SURVEY, 1955, 1: 24,000;
ARGALL, 1949, COLO.SCH. MINES QUART., V. 44, NO. 2
VANDERWILT, 1947, COLO. MINERAL RES. BOARD
COLO BOM AN RPT 1941, 1943
LINTNER, R. E. COLORADO FLUORSPAR MINES, INCORPORATED, SALIDA, COLORADO. DECO TREFOIL MAGAZINE, ENGINEERING NOTE-BOOK BULL. M4-B47, NOVEMBER-DECEMBER 1947, 8 PP.
Sunshine Mining Co. Colorado exploration files, unpublished data, Colorado Geological Survey.
| Subject category | Comment text |
|---|---|
| Deposit | SOUTHERN PART OF MINE HAS BEEN RICHEST PRODUCER;, 3 MAIN VEINS: EAST VEIN, WEST VEIN, AND THE BRANCH OR COLLINS VEIN. EAST AND WEST VEINS STRIKE N 40 W, DIP 65-85 SW; BRANCH VEIN STRIKES WEST, DIPS 45 S. EAST AND WEST VEINS ARE 120-200 FT APART AND WEST AND BRANCH VEINS INTERSECT NEAR SOUTH END OF MINE. EAST VEIN IS ALONG FAULT IN PRECAMBRIAN ROCKS. WEST AND BRANCH VEINS FOLLOW FAULT ZONES BETWEEN PRECAMBRIAN AND TERTIARY FAULTS. EAST VEIN IS PRINCIPAL ORE BODY. IN THE OPEN PIT THE BRANCH VEIN REACHES WIDTHS OF 50 FT OR MORE. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-FEB-1983 | Collins, Donna B. | Colorado Geological Survey | |
| Reporter | 17-NOV-1983 | Intermountain Field Operations Center (IFOC) | U.S. Bureau of Mines | |
| Reporter | 01-OCT-1972 | Conservation Division Files | U.S. Geological Survey | |
| Updater | 10-MAR-2006 | Beach, Richard A. | Colorado Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
These are landing pages for further research — the state agencies don't currently expose per-mine deep links.