| Location: | Alameda County, California, United States, North America |
| Lat / long: | 37.51213, -121.57796 |
| dep_id: | 10109102 |
| mrds_id: | M004925 |
| Commodity type: | metallic |
| Major mineral: | Manganese |
| Operation type: | Unknown |
| Production size: | Small ammount of material produced |
| Development status: | Producer |
| Reporter: | Gere, W., Von Dohlen, E.; Albers, J. |
| hrock_unit: | Franciscan Complex |
| hrock_type: | Chert |
| References: |
- Deposit:: CALIF. JOUR. MINES & GEOL. V. 46, NO. 2, P.340, PL. 58
- Deposit:: DOM BULL. 152, P.23
- Deposit:: BULL. 125, P.100
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