| Deposit ID | 10085020 |
|---|---|
| MRDS ID | W700452 |
| Record type | Site |
| Current site name | McLaughlin Mine |
| Related records | 10116286 |
| Geographic coordinates: | -122.383, 38.4435 (WGS84) |
|---|---|
| Relative position | NORTH OF KNOXVILLE |
Political divisions (FIPS codes)
Napa(county)
California(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Rutherford(quadrangle 1:24,000 scale)
Napa(quadrangle 1:100,000 scale)
Santa Rosa(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
San Pablo Bay(hydrologic unit)
San Francisco Bay(hydrologic accounting unit)
San Francisco Bay(hydrologic subregion)
California(hydrologic region)
| Country | State | County |
|---|---|---|
| United States | California | Napa |
| United States | California | Yolo |
| United States | California | Lake |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Mount Diablo | 011N | 005W | 1 | NE4 | California |
| Commodity | Importance |
|---|---|
| Gold | Primary |
| Silver | Primary |
| Mercury | Secondary |
| Antimony Critical | Tertiary |
| Arsenic Critical | Tertiary |
| Boron-Borates | Tertiary |
| Titanium, Metal Critical | Tertiary |
| Tungsten Critical | Tertiary |
| Materials | Type of material |
|---|---|
| Cinnabar | Ore |
| Stibnite | Ore |
| Barite | Gangue |
| Calcite | Gangue |
| Dolomite | Gangue |
| Marcasite | Gangue |
| Pyrite | Gangue |
| Result | TYPICALLY SUBMICRON SIZE GOLD. AG/AU RATIO RANGES FROM 0.1 NEAR SURFACE TO 100 OR MORE AT DEPTH, WITH AVG. APPROX. 3.5. |
|---|
| Model code | 104 |
|---|---|
| USGS model code | 25a |
| Deposit model name | Hot-spring Au-Ag |
| Mark3 model number | 45 |
| Host or associated | Associated |
|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Glassy Rock > Pumice |
| Host or associated | Associated |
|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite |
| Host or associated | Associated |
|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt |
| Host or associated | Host |
|---|---|
| Rock type | Sedimentary Rock > Clastic Sedimentary Rock > Mudstone |
| Host or associated | Host |
|---|---|
| Rock type | Sedimentary Rock > Clastic Sedimentary Rock > Siltstone |
| Host or associated | Host |
|---|---|
| Rock type | Sedimentary Rock > Clastic Sedimentary Rock > Conglomerate |
| (1) | Quaternary alluvium and marine deposits |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Major Regional Subduction Fault Boundary Dividing The Franciscan Ophiolite Melange Of The Coast Ranges From The Upper Jurassic Marine Sediments Of The Great Valley Forearc Basin. Fault Consists Of 300-800 Ft. Wide Zone Of Cataclasite And Slikentite. Fault Dips Ne 45 In The Mine Area. |
| Type of structure | Local |
| Structure description | Hydrothermal Explosion Breccias, Hydraulically Fractured Rock Masses, Crackle Breccias, Clastic Dikes, And Chalcedony-Quartz Vein Stockwork. |
| Length | 17702.3M |
|---|---|
| Width | 91.44M |
| Depth to bottom | 304.8M |
| Development status | Producer |
|---|---|
| Commodity type | Both |
| Deposit size | Large |
| Significant | No |
| Discovery year | 1978 |
| Discoverer | Homestake Mining Co. |
| Year of first production | 1985 |
| Type | Owner |
|---|---|
| Owner | Homestake Mining Co. |
| Type | In-situ | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1988 | ||||||||||||||
| |||||||||||||||
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | W700452 |
ENGINEERING AND MINING JOURNAL, JUNE, 1988, P. 43.
MINING MAGAZINE, JAN., 1988, P. 50.
LEHRMAN, NORMAN J., 1986, THE MCLAUGHLIN MINE NAPA AND YOLO COUNTIES, CA.: NBMG REPORT 41 P. 85-89.
| Subject category | Comment text |
|---|---|
| Deposit | NATURAL OUTCROPPINGS AND OLD MINE WORKINGS EXTEND A MILE IN STRIKE LENGTH AND APPROX. 300 FEET IN WIDTH. THE OREBODY IS WEDGE-SHAPED IN SECTIONAL VIEW, AND DIPS CONFORMABLY WITH THE HOST FAULT TO THE NE. THE VEINS STRIKE TRANSVERSE TO THE OVERALL OREBODY TREND (WHICH IS ESSENTIALLY CONFORMABLE WITH THE FAULT), SUGGESTING CONTINUED DILATION BY STRIKE SLIP REACTIVATION OF THE OLDER THRUST ZONE. |
| Deposit | THE MCLAUGHLIN DEPOSIT IS AN EXCELLENT EXAMPLE OF NEAR-SURFACE ORE-FORMING PROCESSES (HOT-SPRING WITH SINTER ASSOCIATION). THE SOURCE OF THE ELEMENTS MAKING UP THE DEPOSIT REMAINS UNCLEAR, POSSIBILITIES INCLUDE THE OPHIOLITE MELANGE TO THE WEST, THE GREAT VALLEY SEQUENCE TO THE EAST, THE CLEAR LAKE MAGMAS OR METAMORPHIC FLUIDS FROM THE ANCIENT SUBDUCTED OCEANIC PLATE. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-AUG-1988 | Paidakovich, Matthew E. | U.S. Geological Survey | |
| Updater | 01-NOV-1993 | Moyer, Lorre A. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
MRDS records operators as of each record's last update (≤ 2019). Some of the operators listed here have since changed hands or dissolved:
Curated by qvyshift.com from publicly-reported M&A activity (SEC filings, press releases, USGS Mineral Yearbooks). Not authoritative — verify against primary sources before relying on it. The MSHA panel above is the current authoritative source for actively-permitted mines.
These are landing pages for further research — the state agencies don't currently expose per-mine deep links.