| Location: | Contra Costa County, California, United States, North America |
| Lat / long: | 37.95184, -121.85576 |
| dep_id: | 10109196 |
| mrds_id: | M007150 |
| Commodity type: | metallic |
| Major mineral: | Silica |
| Operation type: | Unknown |
| Production size: | Small ammount of material produced |
| Development status: | Producer |
| Reporter: | Gere, W. |
| References: |
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