| Deposit ID | 10070455 |
|---|---|
| MRDS ID | W013397 |
| Record type | Site |
| Current site name | Yogo Sapphire Mine |
| Alternate or previous names | American Mine |
| Related records | 10148934 |
| Geographic coordinates: | -110.34472, 46.8713 (WGS84) |
|---|---|
| Elevation | 1630 |
| Relative position | 22 KM SOUTHWEST FROM UTICA |
Political divisions (FIPS codes)
Judith Basin(county)
Montana(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Indian Hill(quadrangle 1:24,000 scale)
White Sulphur Springs(quadrangle 1:100,000 scale)
White Sulphur Springs(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Judith(hydrologic unit)
Fort Peck Lake(hydrologic accounting unit)
Missouri-Musselshell(hydrologic subregion)
Missouri(hydrologic region)
Federal lands
Helena-Lewis and Clark National Forest(National Forest)
National Forest FS(Type of land area)
FS(Federal land areas administered by FS)
| Country | State | County |
|---|---|---|
| United States | Montana | Judith Basin |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Montana Principal | 013N | 011E | 21 | Montana |
| Commodity | Importance |
|---|---|
| Gemstone | Primary |
| Host or associated | Host | ||||
|---|---|---|---|---|---|
| Rock type | Sedimentary Rock > Carbonate > Limestone | ||||
| Rock unit name | Madison Limestone | ||||
| Rock description | Madison Limestone | ||||
| |||||
| (1) | -110.34472, 46.8713 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | East Flank Of Domal Uplift Little Belt Mts. |
| General form | DIKE |
|---|---|
| Strike | N 75 E |
| Dip | 90 |
| Thickness | 6M |
| Length | 5600M |
| Depth to top | 0M |
| Development status | Producer |
|---|---|
| Commodity type | Non-metallic |
| Deposit size | Large |
| Significant | No |
| Discovery year | 1880 |
| Discoverer | J. Hoover |
| Year of first production | 1895 |
| District name | Yogo District |
|---|
| Type | Operator |
|---|---|
| Owner | Sapphire International Corp. |
| Type of workings | Underground |
|---|---|
| Overall depth | 90M |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | W013397 |
CLABAUGH, S. E., 1952, CORUNDUM DEPOSITS OF MONTANA: U.S. GEOLOGICAL SURVEY BULL. 983, P. 6 - 3
| Subject category | Comment text |
|---|---|
| Deposit | THE MONCHIQUITE DIKE INTRUDES MADISON LIMESTONE. THE SAPPHIRES IN THE PLACER DEPOSITS HAVE WEATHERED FROM THIS DIKE |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-FEB-1976 | Berg, Richard B. (Krohn, D. H.) | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
| Status | Abandoned since 02/24/2026 |
|---|---|
| MSHA mine ID | 2400775 |
| Mine name (MSHA) | YOGO SAPPHIRE MINE |
| Current operator | Yogold U.S.A. Corporation |
| Current controller (parent) | Jerod Edington |
| Mine type | Underground (Metal / non-metal) |
Inferred by coordinate + name similarity (1604 m, 1.00 match). Confirm against MSHA if precision matters — non-USGS-curated cross-references may occasionally point at a neighbouring mine.
Open MSHA's Mine Data Retrieval System for inspections, accidents, and violations for this mine.