| Deposit ID | 10262234 |
|---|---|
| MRDS ID | W025079 |
| MAS/MILS ID | 0060810057 |
| Record type | Site |
| Current site name | Langley Hill Quarry |
| Alternate or previous names | Langley Hill Quarry and Mill |
| Related records | 10111035 |
| Point of reference | Ore Body |
|---|---|
| Geographic coordinates: | -122.23294, 37.36771 (WGS84) |
| Elevation | 439 |
| Location accuracy | 100(meters) |
Political divisions (FIPS codes)
San Mateo(county)
California(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Mindego Hill(quadrangle 1:24,000 scale)
Palo Alto(quadrangle 1:100,000 scale)
San Francisco(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Coyote(hydrologic unit)
San Francisco Bay(hydrologic accounting unit)
San Francisco Bay(hydrologic subregion)
California(hydrologic region)
| Country | State | County |
|---|---|---|
| United States | California | San Mateo |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Mount Diablo | 004 S | 003 W | 07 | California |
| Commodity | Importance |
|---|---|
| Stone, Crushed/Broken | Primary |
| Ore Body (1) | -122.23294, 37.36771 |
|---|
| Operation type | Surface |
|---|---|
| Development status | Producer |
| Commodity type | Non-metallic |
| Significant | No |
| Ownership category | Private |
|---|
| Type | Owner-Operator |
|---|---|
| Owner | Dempsey, Michael And Pat |
| ID | 400170 |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0060810057 | |
| USGS | Mineral Resources Data System | MRDS | W025079 | MAS references MRDS |
| Mine Safety and Health Administration | MSHA | MSHA | 0400170 |
U.S.B.M. RESPONDENT FILE (1971)
COMMODITY TRAPROCK
CALIF. DIV. MINES AND GEOLOGY SPECIAL PUBL. 103, 1990.
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 28-FEB-1991 | Western Field Operations Center (WFOC) | U.S. Bureau of Mines |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
| Status | Active since 01/23/1989 |
|---|---|
| MSHA mine ID | 0400170 |
| Mine name (MSHA) | Langley Hill Quarry |
| Current operator | Langley Hill Quarry |
| Current controller (parent) | Michael W Dempsey; Patrick K Dempsey |
| Mine type | Surface (Metal / non-metal) |
MSHA cross-reference per the original MRDS record. Mine status and operator reflect MSHA's last published Mines export (February 2025); MSHA's public bulk feed has been unavailable since, so this may be out of date. See the Mine Data Retrieval System for current status.
Open MSHA's Mine Data Retrieval System for inspections, accidents, and violations for this mine.
These are landing pages for further research — the state agencies don't currently expose per-mine deep links.