Contra Costa County, CA Clays Mines
Clays Mines in Contra Costa County, CA
| Mine | Owner | Land Status | Work Type | Minerals |
|---|---|---|---|---|
| Alves Pit | Eugene G. Alves | Unknown | Clays | |
| United Materials and Richmond Pressed Brick Co. | Clays | |||
| Unnamed Location | Unknown | Clays | ||
| Untd. Mtrls. & Rchmnd.Prssd.Brck.Co | Unknown | Clays |
Contra Costa County, CA Clays Mines
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