Historic gold producers in San Mateo County (USGS)
USGS records 9 historic gold producers in San Mateo County: 7 past producers and 2 listed as producers or plants. For 4 of them USGS gives an output size (4 small).
Show the 9 sites
| Site | USGS status | Output | Commodities | Years |
|---|---|---|---|---|
| Black Mtn. | Past producer | small | Gold | n/a |
| Deniston Peak | Past producer | small | Gold | n/a |
| Durham Ranch | Past producer | small | Gold, Silver | n/a |
| J.M. Macdonough Ranch | Past producer | small | Gold, Silver, Lead | n/a |
| Unnamed Location | Producer | n/a | Gold, Silver, Potassium | n/a |
| Unnamed Location | Producer | n/a | Gold | n/a |
| Black Mountain | Past producer | n/a | Gold | n/a |
| Unnamed Location | Past producer | n/a | Gold | n/a |
| Unnamed Location | Past producer | n/a | Gold, Potassium, Silver | n/a |
Source: USGS Mineral Resources Data System (retrieved 2026-10-13). The database was last updated around 2011, positions can be approximate and "producer" does not mean a mine is operating today. Sites already matched to an MSHA record are shown in the MSHA tables.
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