RockWoofFound alongside
Copper
Mohs 2.5–3. Native copper is soft and turns green as it weathers. Mindat
40 sites
Magnetite
Mohs 5.5–6.5. Black and strongly magnetic. Mindat
3 sites
Pyrite
Mohs 6–6.5. Brassy “fool’s gold,” often cubic. Mindat
3 sites
Silver
Mohs 2.5–3. Native silver tarnishes black. Mindat
3 sites
Tourmaline
Mohs 7–7.5. Long striated crystals, often black (schorl) or green and pink (elbaite). Mindat
1 site
Quartz
Mohs 7. Six-sided points; smoky quartz is NH’s state gem. Mindat
1 site
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
By county
Somerset County (11) · Middlesex County (8) · Essex County (6) · Hunterdon County (4) · Warren County (4) · Bergen County (2) · Mercer County (1) · Union County (1) · Passaic County (1) · Sussex County (1) · Hudson County (1)
Sites
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Dod Mine | Copper | Chalcocite | Past Producer | 40.781, -74.216 |
| Pahaquarry Mine | Copper | Chalcocite | Past Producer | 41.031, -75.032 |
| Griggstown Mine | Copper | Chalcocite, Chalcopyrite, Chrysocolla, Copper, Cuprite, Malachite | Occurrence | 40.426, -74.612 |
| Flemington Mines-1 | Copper | Chalcocite, Chalcopyrite, Chrysocolla, Cuprite, Malachite | Past Producer | 40.506, -74.869 |
| Glen Ridge Mine | Copper | Chalcocite, Chrysocolla | Past Producer | 40.799, -74.202 |
| Woosamonsa Prospect | Copper | Chalcocite, Chrysocolla | Occurrence | 40.338, -74.836 |
| Chimney Rock Mine | Copper | Chalcocite, Chrysocolla, Copper | Past Producer | 40.581, -74.558 |
| Banghart Mine | Iron | Chalcopyrite, Magnetite | Past Producer | 40.703, -74.916 |
| Menlo Park Mine | Copper | Chrysocolla | Past Producer | 40.564, -74.333 |
| New Brunswick Mines | Copper | Chrysocolla, Copper, Cuprite | Past Producer | 40.512, -74.457 |
| American Mine | Copper | Chrysocolla, Copper, Cuprite, Malachite | Past Producer | 40.615, -74.615 |
| Stony Brook Mines | Copper | Copper | Past Producer | 40.633, -74.443 |
| Hoffman Prospect | Copper | Copper | Past Producer | 40.640, -74.627 |
| Schuyler Mine | Copper | Copper, Malachite, Silver | Past Producer | 40.779, -74.129 |
| Pahaquarry Mine | Copper | — | Past Producer | 41.031, -75.032 |
| Wigwam Brook Mine | Copper | — | Occurrence | 40.781, -74.230 |
| Raritan Mine | Copper | — | Past Producer | 40.458, -74.488 |
| Feltville Mine | Copper | — | Past Producer | 40.636, -74.445 |
| New Brunswick French Mine | Copper | — | Past Producer | 40.501, -74.458 |
| Flemington Mines/Neshanic Mine | Copper | — | Past Producer | 40.514, -74.858 |
| Totowa Mine | Copper | — | Past Producer | 40.900, -74.220 |
| Griggstown Franklin Mine | Copper | — | Past Producer | 40.428, -74.613 |
| Glen Ridge Mine | Copper | — | Past Producer | 40.825, -74.213 |
| Dod Mine | Copper | — | Past Producer | 40.767, -74.201 |
| Wigwam Brook Mine | Copper | — | Past Producer | 40.767, -74.233 |
| Schuyler Mine | Copper | — | Past Producer | 40.803, -74.105 |
| Pahaquarry Mine | Copper | — | Past Producer | 41.031, -75.036 |
| Chimney Rock Mines | Copper | — | Past Producer | 40.582, -74.563 |
| Stony Brook Mines | Copper | — | Past Producer | 40.600, -74.366 |
| Menlo Park Mine | Copper | — | Past Producer | 40.570, -74.320 |
| American Bridgewater Mine/Hoffman Mine | Copper | — | Past Producer | 40.617, -74.616 |
| Pahaquarry Copper Mine | — | — | Past Producer | 41.028, -75.035 |
| Griggstown Copper Mine | — | — | Past Producer | 40.431, -74.610 |
| Andover-Sulphur Hill Mine | — | — | Past Producer | 41.006, -74.733 |
| (Facility) Asarco Refinery/ Perth Amboy, N.J. | Copper | — | Plant | 40.512, -74.268 |
| Somerville Copper Mine | — | — | Past Producer | 40.607, -74.615 |
| Menlo Park Mine | Copper | — | Past Producer | 40.576, -74.339 |
| Flemington Copper Mine | — | — | Past Producer | 40.507, -74.867 |
| Hoffman Copper Mine | — | — | Past Producer | 40.639, -74.627 |
| Arlington Copper Mine | — | — | Past Producer | 40.778, -74.128 |
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