| Lat / long: | 38.4435, -122.383 |
| Primary: | Silver, Gold |
| Secondary: | Mercury |
| Tertiary: | Antimony, Arsenic, Titanium, Metal, Tungsten, Boron-Borates |
| Ore: | Cinnabar, Stibnite |
| Gangue: | Barite, Calcite, Dolomite, Marcasite, Pyrite |
| Discovery year: | 1978 |
| Operation type: | Unknown |
| Production size: | Yes |
| Development status: | Producer |
| First production started: | 1985 |
| Host type: | Mudstone,Siltstone,Conglomerate |
| Associated type: | Pumice,Andesite,Basalt |
| Structure: | 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., Hydrothermal Explosion Breccias, Hydraulically Fractured Rock Masses, Crackle Breccias, Clastic Dikes, And Chalcedony-Quartz Vein Stockwork. |
| Alteration processes: | Complex And Overlapping; Argillic Zones, Sporadic Alunite Nodules, Chlorite-Montmorillonite-Celadonite Assemblages. Pervasive Adularia Replacement In Hanging Wall. Irregular Zone Of Silica-Carbonate Alteration Parallels The Precious Metals System Within The Footwall. |
| MRDS | W700452 |
| DEP | 10085020 |
| Reference | {Deposit:: ENGINEERING AND MINING JOURNAL, JUNE, 1988, P. 43.}{Deposit:: MINING MAGAZINE, JAN., 1988, P. 50.}{Deposit:: LEHRMAN, NORMAN J., 1986, THE MCLAUGHLIN MINE NAPA AND YOLO COUNTIES, CA.: NBMG REPORT 41 P. 85-89.} |
| Reporter | Paidakovich, Matthew E., Moyer, Lorre A. |