| Deposit ID | 10071873 |
|---|---|
| MRDS ID | W015560 |
| Record type | Site |
| Current site name | Helena Placers |
| Alternate or previous names | Last Chance Gulch, Tenmile Creek |
| Related records | 10270207 |
| Geographic coordinates: | -111.98005, 46.59129 (WGS84) |
|---|---|
| Elevation | 1280 |
| Relative position | SITUATED BENEATH HELENA BUSINESS DISTRICT |
Political divisions (FIPS codes)
Lewis and Clark(county)
Montana(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
East Helena(quadrangle 1:24,000 scale)
Canyon Ferry Dam(quadrangle 1:100,000 scale)
White Sulphur Springs(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Upper Missouri(hydrologic unit)
Upper Missouri(hydrologic accounting unit)
Missouri-Marias(hydrologic subregion)
Missouri(hydrologic region)
| Country | State | County |
|---|---|---|
| United States | Montana | Lewis and Clark |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Montana Principal | 010N;010N | 004W;003W | 36,25;30,31 | Montana |
| Commodity | Importance |
|---|---|
| Gold | Primary |
| Materials | Type of material |
|---|---|
| Gold | Ore |
| Model code | 119 |
|---|---|
| USGS model code | 39a |
| Deposit model name | Placer Au-PGE |
| Mark3 model number | 54 |
| Host or associated | Associated | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Granitoid > Granite | ||||||||
| Rock unit name | Boulder Batholith | ||||||||
| Rock description | Boulder Batholith | ||||||||
| |||||||||
| Host or associated | Host |
|---|---|
| Rock type | Unconsolidated Deposit > Gravel |
| Rock unit name | Gravels, Alluvium |
| Rock description | Gravels, Alluvium |
| (1) | -111.98005, 46.59129 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Boulder Batholith |
| General form | IRREGULAR |
|---|
| Development status | Past Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Large |
| Significant | Yes |
| Discovery year | 1864 |
| Discoverer | George Cowan, Robert Stanley, Gabe Johnson |
| Year of first production | 1864 |
| District name | Helena District |
|---|
| Ownership category | Private |
|---|
| Year | 1953 |
|---|---|
| Period | 1864-1953 |
| Material | gold |
| Ore mined | 29mt |
| Accuracy | Accurate |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | W015560 |
LYDEN, C. J., 1948, THE GOLD PLACERS OF MONTANA, MONT. BUREAU OF MINES AND GEOL. MEMOIR NO. 26 P. 56-57
KOSCHMANN AND BERGENDAHL, PRINCIPAL GOLD-PRODUCING DISTRICTS OF THE UNITED STATES, U. S. GEOLOGICAL SURVEY PROF. PAPER 610, P. 105
LYDEN, C. J., 1948, THE GOLD PLACERS OF MONTANA
| Subject category | Comment text |
|---|---|
| Deposit | ALL OF THE GOLD PLACER DEPOSITS OF THE HELENA VALLEY ARE INCLUDED IN THE DISCUSSION, PRODUCTION FIGURES, ETC. ON THIS FORM |
| Deposit | IT IS STATED THAT MOST OF THE $16,000,000 RECOVERED BY 1910 WAS REMOVED DURING OR BEFORE 1868. THE GOLD IN THE GRAVELS IN THIS DISTRICT ARE THOUGHT TO HAVE BEEN DERIVED FROM LODE DEPOSITS WITHIN THE DRAINAGE BASIN OF LAST CHANCE CREEK AND ASSOCIATED TRIBUTARIES. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-MAR-1977 | Mckenzie, Craig L.; R. B. Berg | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.