RockWoofFound alongside
Silver
Mohs 2.5–3. Native silver tarnishes black. Mindat
97 sites
Copper
Mohs 2.5–3. Native copper is soft and turns green as it weathers. Mindat
77 sites
Quartz
Mohs 7. Six-sided points; smoky quartz is NH’s state gem. Mindat
56 sites
Feldspar
Mohs 6–6.5. Blocky crystals with flat cleavage faces. Mindat
38 sites
Gold
Mohs 2.5–3. Soft, heavy and bright yellow; it doesn’t tarnish. Mindat
12 sites
Pyrite
Mohs 6–6.5. Brassy “fool’s gold,” often cubic. Mindat
6 sites
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
By county
Ontonagon County (35) · Houghton County (29) · Keweenaw County (16) · Marquette County (10) · Baraga County (4) · Gogebic County (3)
Sites (first 60)
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| White Pine Mine | Copper | Chalcocite, Copper, Silver | Past Producer | 46.744, -89.534 |
| Quincy Mine | Copper, Silver | Copper | Past Producer | 47.143, -88.570 |
| Belt Mine (Piscatauqua) | Copper | Copper | Past Producer | 46.783, -89.067 |
| Lake Superior Mine | Copper | Copper | Past Producer | 46.739, -89.147 |
| Mohawk Mine | Copper | Copper | Past Producer | 47.305, -88.359 |
| La Salle Mine | Copper | Copper | Past Producer | 47.213, -88.469 |
| Kearsarge Mine | Copper | Copper | Past Producer | 47.245, -88.433 |
| Isle Royale Mine | Copper | Copper | Past Producer | 47.098, -88.580 |
| Centennial Mine | Copper | Copper | Past Producer | 47.256, -88.423 |
| Gratiot Copper Mine | Silver, Copper | Copper | Past Producer | 47.315, -88.345 |
| Elm River Mine | Copper | Copper | Past Producer | 46.923, -88.830 |
| Cherokee Mine | Copper | Copper | Past Producer | 46.843, -88.967 |
| Mayflower Old Colony Mine | Copper | Copper | Past Producer | 47.257, -88.395 |
| Winona Mine | Copper | Copper | Past Producer | 46.875, -88.907 |
| Algomah Mine | Copper | Copper | Past Producer | 46.761, -89.040 |
| Indiana Mine | Copper | Copper | Past Producer | 46.799, -88.997 |
| Old Mass Mine | Copper | Copper | Past Producer | 46.756, -89.113 |
| King Philip Mine | Copper | Copper | Past Producer | 46.871, -88.919 |
| Carp Lake Mine | Copper | Copper, Chalcocite | Past Producer | 46.815, -89.716 |
| Cuyahoga Mine | Copper | Copper, Chalcocite | Past Producer | 46.816, -89.699 |
| Lafayette Mine | Copper | Copper, Chalcocite | Past Producer | 46.778, -89.821 |
| Minesota Mine | Copper | Copper, Silver | Past Producer | 46.730, -89.176 |
| Flintsteel River Mine | Copper | Copper, Silver | Past Producer | 46.739, -89.131 |
| Adventure Consolidated Mine | Copper | Copper, Silver | Past Producer | 46.773, -89.073 |
| Rockland Mine | Copper | Copper, Silver | Past Producer | 46.734, -89.164 |
| National Mine | Copper | Copper, Silver | Past Producer | 46.727, -89.187 |
| Evergreen Series | Copper | Copper, Silver | Past Producer | 47.367, -88.074 |
| Mass Consolidated Mine | Copper | Copper, Silver | Past Producer | 46.765, -89.100 |
| Caledonia Mine (Nebraska) | Copper | Copper, Silver | Producer | 46.751, -89.119 |
| Kearsarge Amygdaloid | Copper | Copper, Silver | Past Producer | 47.278, -88.418 |
| Pewabic Amygdaloid | Copper | Copper, Silver | Past Producer | 47.133, -88.567 |
| Fissure Mines | Copper | Copper, Silver | Past Producer | 47.367, -88.323 |
| Phoenix Fissure Mine | Copper | Copper, Silver | Past Producer | 47.385, -88.295 |
| Michigan Mine | Copper | Copper, Silver | Past Producer | 46.731, -89.158 |
| Isle Royale Amygdaloid | Copper | Copper, Silver | Past Producer | 47.098, -88.580 |
| Ropes Mine | Gold, Silver | Gold | Producer | 46.536, -87.733 |
| Superior Gold & Silver Exploration | Gold, Silver | Gold | Prospect | 46.520, -87.696 |
| Daniel Sec 30 Gold Prospect | Silver, Gold, Copper | Gold, Copper, Silver | Occurrence | 46.702, -87.596 |
| Silver River Silver Prospect | Silver | Silver | Prospect | 46.758, -88.357 |
| Lone Rock Silver Prospect | Silver | Silver | Prospect | 46.791, -89.816 |
| Marquette Silver Prospect | Silver | Silver | Prospect | 46.659, -87.790 |
| Mammoth Silver Prospect | Silver | Silver | Occurrence | 46.819, -89.579 |
| Beaser Silver Prospect | Gold | Silver | Occurrence | 46.819, -89.569 |
| Holyoke Silver Mine | Silver | Silver, Gold | Prospect | 46.588, -87.638 |
| Kingston No.1 | Copper | — | Past Producer | 47.280, -88.387 |
| North Kearsarge | — | — | Past Producer | 47.833, -88.405 |
| (Facility) White Pine Copper Refinery | Copper | — | Plant | 46.750, -89.583 |
| Iroquois No. 1 | Copper | — | Past Producer | 47.320, -88.352 |
| Unnamed Silver and Lead Prospect | Lead, Silver | — | Occurrence | 46.675, -87.853 |
| Superior | — | — | Past Producer | 47.077, -88.599 |
| Michigan | — | — | Past Producer | 46.730, -89.159 |
| Kearsarge Amygdaloid No.1 | Copper | — | Past Producer | 47.278, -88.418 |
| Calumet No.1 | Copper | — | Past Producer | 47.249, -88.430 |
| Rockland | — | — | Past Producer | 46.734, -89.164 |
| Unnamed Silver Prospect | Silver | — | Prospect | 46.758, -88.417 |
| White Pine | Copper | — | Producer | 46.763, -89.463 |
| Cliff | — | — | Past Producer | 47.374, -88.314 |
| Unnamed Silver and Copper Prospect | Copper, Silver | — | Occurrence | 46.704, -87.597 |
| Osceola No.1 | Copper | — | Past Producer | 47.223, -88.456 |
| Centennial No. 3-6 | Copper | — | Past Producer | 47.264, -88.429 |
Back to Rockhounding in Michigan.
How we built this page: we counted named sites in the USGS Mineral Resources Data System (MRDS) for this area, left out sand, gravel, crushed stone, clay pits and unnamed sites, grouped them by Census county, and linked every site to its USGS record. We did not visit these sites, and MRDS does not tell you who owns the land or whether collecting is allowed.
Source: USGS Mineral Resources Data System (MRDS). USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date. Each site links to its USGS record.
Updated