| Location: | Contra Costa County, California, United States, North America |
| Lat / long: | 37.92934, -122.43077 |
| dep_id: | 10110637 |
| mrds_id: | W023533 |
| Commodity type: | metallic |
| Major mineral: | Manganese |
| Operation type: | Unknown |
| Production size: | Production occurred |
| Development status: | Producer |
| Reporter: | Unknown |
| References: |
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