Abandoned gold mine records in Jefferson County
3 records marked abandoned by MSHA. They are listed for reference only. Land status is from BLM's public dataset and can be out of date; being on public land is not permission to enter old workings.
Show the 3 abandoned records
| Name | Type | Status since | Nearest town | Land | USGS record |
|---|---|---|---|---|---|
| M H S Lab | processing facility | Mar 13, 1990 | n/a | n/a | n/a |
| Precious Metals Refining Plant | processing facility | Aug 28, 1985 | n/a | n/a | n/a |
| Rocky Flats Facility | processing facility | Nov 6, 2023 | Arvada | Private land or land not mapped as public | n/a |
Historic gold producers in Jefferson County (USGS)
USGS records 13 historic gold producers in Jefferson County: 12 past producers and 1 listed as a producer or plant. For 8 of them USGS gives an output size (1 medium, 7 small). Production years are recorded for 8 sites, from 1858 to 1979.
Show the 13 sites
| Site | USGS status | Output | Commodities | Years |
|---|---|---|---|---|
| Ralston Buttes District | Producer | medium | Uranium, Copper, Molybdenum, Zinc, Lead, Silver, Gold, Bismuth, Manganese, Nickel, Cobalt | from 1895 |
| Swadley Placers | Past producer | small | Gold | 1858 to 1859 |
| Malachite Mine | Past producer | small | Gold, Copper, Silver, Zinc, Nickel, Lead | from 1888 |
| Buffalo Mine | Past producer | small | Lead, Gold, Silver, Fluorine-Fluorite | 1895 to 1898 |
| Unnamed Placer | Past producer | small | Gold | 1935 |
| Unnamed Placer | Past producer | small | Gold | 1935 |
| Unnamed Placers | Past producer | small | Gold | 1935 |
| Augusta Mine | Past producer | small | Copper, Silver, Fluorine-Fluorite, Stone, Crushed/Broken, Zinc, Lead, Gold, Cobalt | to 1966 |
| Evergreen Florite Deposit | Past producer | n/a | Fluorine-Fluorite, Copper, Gold, Lead, Silver | n/a |
| Foothills | Past producer | n/a | Gold, Silver | n/a |
| Rio Grande Pit | Past producer | n/a | Sand and Gravel, Construction, Gold, Silver | to 1973 |
| Union Mica Lode | Past producer | n/a | Gold, Beryllium, Mica, Silver | n/a |
| Youngfield Pit | Past producer | n/a | Sand and Gravel, Construction, Gold | to 1979 |
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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