Manganese past producer · San Bernardino County, California
| State | California |
| County | San Bernardino |
| Coordinates | 34.83921, -116.36056 |
| Primary | Manganese |
| Secondary | Iron |
| Tertiary | Phosphorus-Phosphates, Silica, Sulfur |
| Status | Past Producer |
| Type | Surface |
| First Production | 1934 |
| Discovery Year | 1930 |
| Data Source | USGS MRDS |
| Source ID | 10115894 |
| Site | Distance | Commodity | Status |
|---|---|---|---|
| Logan Mine | 0.0 mi | Manganese | Producer |
| Read Ridge | 0.9 mi | Manganese | Prospect |
| Unnamed Mangenese Prospect (San Bernardino County) | 1.0 mi | Manganese | Prospect |
| Hoerner-Ross Pegmatite | 2.0 mi | Uranium | Prospect |
| Big Reef | 2.6 mi | Manganese | Producer |
| Big Reef Mine | 2.6 mi | Past Producer | |
| Heather Pumice Prospect | 2.8 mi | Pumice | Occurrence |
| Hoerner - Ross Pegmatite | 3.9 mi | Niobium (Columbium), Tantalum, REE, Uranium, Thorium | Occurrence |
| Farway | 4.4 mi | Pumice | Occurrence |
| Unnamed Pit (San Bernardino County) | 4.4 mi | Sand and Gravel, Construction | Past Producer |
| Unnamed Jasper Occurrence (San Bernardino County) | 4.9 mi | Gemstone | Occurrence |
| Preston | 5.1 mi | Lead | Prospect |
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.