| Locality type: | Mine |
| Classification |
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| Type: | Chert |
| Confirmation |
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| Validity: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Chert data |
| Locality Data: | Click here to view Portland Mine, Imperial Heights, Baraga County, Michigan, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 398277 |
| Long-form Identifier: | 1:3:398277:8 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Chert |
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| 0.4km (0.3 miles) | ⓘSteward Mine (Orleans), Imperial Heights, Baraga County, Michigan, USA |
| 1.5km (0.9 miles) | ⓘNorwood Mine, Imperial Heights, Baraga County, Michigan, USA |
| 1.5km (0.9 miles) | ⓘOhio Mines (Imperial Mine; Webster Mine), Imperial Heights, Baraga County, Michigan, USA |
| 1.6km (1.0 miles) | ⓘSpurr Mine, Imperial Heights, Baraga County, Michigan, USA |
| 2.2km (1.4 miles) | ⓘBeaufort Mine (Northrup), Baraga County, Michigan, USA |
| 2.5km (1.6 miles) | ⓘTitan Mine, Baraga County, Michigan, USA |
| 4.2km (2.6 miles) | ⓘMichigamme Mine, Michigamme, Michigamme Township, Marquette County, Michigan, USA |
| 19.7km (12.3 miles) | ⓘNew Humboldt Mine, Humboldt Township, Marquette County, Michigan, USA |
| 20.2km (12.6 miles) | ⓘHumboldt Mine (Edwards Mine), Humboldt Township, Marquette County, Michigan, USA |
| 26.4km (16.4 miles) | ⓘTaylor Mine, Alberta, Baraga County, Michigan, USA |
| References |
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