RockWoofFound alongside
Feldspar
Mohs 6–6.5. Blocky crystals with flat cleavage faces. Mindat
15 sites
Magnetite
Mohs 5.5–6.5. Black and strongly magnetic. Mindat
12 sites
Mica
Mohs 2–3. Peels into thin, flexible, shiny sheets. Mindat
9 sites
Pyrite
Mohs 6–6.5. Brassy “fool’s gold,” often cubic. Mindat
5 sites
Quartz
Mohs 7. Six-sided points; smoky quartz is NH’s state gem. Mindat
4 sites
Garnet
Mohs 6.5–7.5. Usually deep red, round many-faced crystals. Mindat
2 sites
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
By county
Warren County (9) · Morris County (5) · Ocean County (1)
Sites
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Mount Pleasant Mine | Iron | Magnetite | Past Producer | 40.901, -74.567 |
| Meadow Mine | Iron | Magnetite | Past Producer | 40.901, -74.567 |
| Queen Mine | Iron | Magnetite | Past Producer | 40.814, -75.019 |
| Washington Mine | Iron | Magnetite | Past Producer | 40.791, -75.001 |
| Lanning Mine | Iron | Magnetite | Past Producer | 40.793, -74.996 |
| Staley Mine | Iron | Magnetite | Past Producer | 40.798, -74.995 |
| Hann Mine | Iron | Magnetite | Past Producer | 40.781, -74.843 |
| Stephens Mine | Iron | Magnetite | Past Producer | 40.846, -74.732 |
| Bryant Mine | Iron | Magnetite | Past Producer | 40.894, -74.806 |
| Eureka Mine | Iron | Magnetite | Past Producer | 40.905, -74.767 |
| Charlottesburg Mine | Iron | Magnetite | Past Producer | 41.019, -74.432 |
| Halfway Mica Mine | — | — | Past Producer | 40.748, -75.047 |
| Pequest Mine | Iron | — | Past Producer | 40.832, -74.968 |
| Pahaquarry Copper Mine | — | — | Past Producer | 41.028, -75.035 |
| Manchester Unit & Plant | Titanium | — | Past Producer | 39.985, -74.345 |
Back to Rockhounding in New Jersey.
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 USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date.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