Copper, Gold, Silver past producer · Riverside County, California
| State | California |
| County | Riverside |
| Coordinates | 34.04255, -114.49640 |
| Tertiary | Copper, Gold, Silver |
| Status | Past Producer |
| Type | Underground |
| Discovery Year | 1939 |
| Data Source | USGS MRDS |
| Source ID | 10237279 |
| Site | Distance | Commodity | Status |
|---|---|---|---|
| Morning Star Mine | 0.0 mi | Gold | Producer |
| Mountaineer Mine | 0.1 mi | Manganese, Gold, Copper | Occurrence |
| Unnamed Prospect near Poston, AZ | 0.2 mi | Gold | Prospect |
| Agnes Wilson Quarry | 0.3 mi | Stone, Crushed/Broken | Producer |
| Sand and Gravel, Borrow Pits | 0.3 mi | Sand and Gravel, Construction | Past Producer |
| Unnamed Prospect near Poston, AZ | 0.3 mi | Copper | Prospect |
| Nicolite Claim | 0.5 mi | Copper | Occurrence |
| Calzona Mine | 0.6 mi | Gold | Prospect |
| Combination Prospect | 0.7 mi | Gold | Occurrence |
| Unnamed Manganese Claims near Poston, AZ | 0.7 mi | Manganese | Occurrence |
| Unnamed Gold Prospect near Poston, AZ | 0.8 mi | Gold | Occurrence |
| Niagra Prospect | 0.8 mi | Gold | Occurrence |
This mine is a past producer — it was once operational but is no longer actively mining. Past producer sites may still have environmental impacts including disturbed land, tailings piles, and potential water quality effects. Some past producer sites have been reclaimed, while others remain as-is. Check with your state mining or environmental agency for current site conditions.