| Deposit ID | 10013774 |
|---|---|
| MRDS ID | D010249 |
| Record type | Site |
| Current site name | Last Chance Mine |
| Alternate or previous names | Kramer Mine, Lower Adit, Adit No. 1, Adit No. 2, Commercial Minerals, Inc., claims |
| Related records | 10262904, 10238636 |
| Geographic coordinates: | -106.06671, 38.65194 (WGS84) |
|---|---|
| Elevation | 2377 |
| Location accuracy | 100(meters) |
| Relative position | 6.5 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)
Federal lands
Bureau of Land Management(Bureau of Land Management CO)
Bureau of Land Management CO BLM(Type of land area)
BLM(Federal land areas administered by BLM)
| Country | State | County |
|---|---|---|
| United States | Colorado | Chaffee |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| New Mexico | 051N | 008E | 22 | S2 OF SW OF SE | Colorado |
| Materials | Type of material |
|---|---|
| Fluorite | Ore |
| Barite | Gangue |
| Calcite | Gangue |
| Chalcedony | Gangue |
| Goethite | Gangue |
| Hematite | Gangue |
| Kaolinite | Gangue |
| Manganite | Gangue |
| Montmorillonite | Gangue |
| Opal | Gangue |
| Psilomelane | Gangue |
| Pyrite | Gangue |
| Pyrolusite | Gangue |
| Quartz | Gangue |
| Result | FLOTATION CONCENTRATES AVERAGED 93-98% CAF2 AND 1-5% SIO2 |
|---|---|
| Result | EARLIER HAND PICKED METALLURGICAL-GRADE PRODUCT CONTAINE 80-95% CAF2 AND 2.5-15% SIO2 |
| Result | AVERAGE GRADE OF ORE MINED WAS 30% CAF2 |
| Result | ONE SAMPLE CONTAINED 59.2% CAF2, 24.6% FE2O3, 9.8% SIO2, 3.8% CACO3, 1.7% H2O-MOST ORE, HOWEVER CONTAINED MORE SILICA AND LT 1% CACO3 |
| Model code | 174 |
|---|---|
| USGS model code | 26b |
| Deposit model name | Fluorspar deposits (fluorite veins) |
| Host or associated | Associated | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Rock type | Metamorphic Rock > Gneiss | ||||||||
| Rock unit name | Gneissic Quartz Monzonite | ||||||||
| Rock description | Gneissic Quartz Monzonite | ||||||||
| |||||||||
| Host or associated | Host |
|---|---|
| Rock type | Metamorphic Rock > Gneiss |
| Rock unit name | Banded Gneiss |
| Rock description | Banded Gneiss |
| (1) | Dry Union Fm |
|---|
| 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 |
| Strike | N 65 W |
|---|---|
| Dip | 60 NE |
| Thickness | 91.44M |
| Length | 457.2M |
| Width | 3.66M |
| Development status | Past Producer |
|---|---|
| Commodity type | Both |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1923 |
| Year of first production | 1927 |
| Year of last production | 1949 |
| District name | Browns Canyon District |
|---|
| Ownership category | Private |
|---|
| Type | Owner |
|---|---|
| Owner | Commercial Minerals, Inc. |
| First year | 1969 |
| Year | 1942 |
|---|---|
| Period | BEFORE 1942 |
| Material | FLUORSPAR CONCENTRATES |
| Ore mined | 984.2mt |
| Accuracy | Estimate |
| Year | 1944 |
|---|---|
| Period | 1942-1944 |
| Material | FLUORSPAR CONCENTRATES |
| Ore mined | 9842mt |
| Accuracy | Estimate |
| Type of workings | Surface/Underground |
|---|---|
| Area | 0.666HA |
| Length | 990.6M |
| Overall depth | 76.2M |
| Overall length | 487.68M |
| Overall width | 146.3M |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | D010249 | |
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0080150176 | |
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0080150174 |
BRADY, B.T., 1975, MAP SHOWING FLUORSPAR DEPOSITS IN COLORADO: USGS MAP MR-70, 1:500,000, TEXT
VAN DIVER, B.B., 1957, GEOLOGY OF THE CALUMET MINING DISTRICT, CHAFFEE COUNTY, COLORADO: UNIVERSITY OF COLORADO THESIS, P. 83.
VANDERWILT, 1947, COLO. MINERAL RES. BOARD
ARGALL, 1949, COLO. SCH. MINES QUART., V. 44, NO. 2
CONSV. DIV. COMP. DATE, 1,64
USBM MINERAL EXAM. FILE
MINE MAP REPO 404956
RECK, W. H., 1943, KRAMER MINES, INC.: DECO TREFOIL MAGAZINE, ENGINEERING NOTEBOOK BULL. M4-B28, MAY 1943, 12 PP.
| Subject category | Comment text |
|---|---|
| Deposit | IN PLACES FAULT CONSISTS OF SHEETED ZONE CONTAINING MANY VEINS OF FLUORSPAR, SOME 6 IN THICK; TWO MAIN ORE BODIES, EACH ABOUT 460X12X25 FT THICK |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-FEB-1983 | Collins, Donna B. | Colorado Geological Survey | |
| Reporter | 01-MAR-1973 | Conservation Division Files | U.S. Geological Survey | |
| Reporter | 17-NOV-1983 | Intermountain Field Operations Center (IFOC) | U.S. Bureau of Mines | |
| 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.