Portland, MI Mines
Mines in Portland, Michigan
| Mine | Owner | Land Status | Work Type | Minerals |
|---|---|---|---|---|
| Ionia Co. Road Comm. Pit | County | Sand and Gravel | ||
| Ionia County Road Commission | County | Sand and Gravel | ||
| Williams Bros No 1 | Williams Brothers Asphalt Paving Co. | Private | Sand and Gravel |