RockWoofSketch map
Woof’s favorite find
Dod Mine
We picked it because its USGS record mentions 1 of the minerals on our cards and 1 of our card minerals overall. That ties with 5 other site(s), so we broke the tie by mine status (past producers first), then USGS record quality, then name. USGS lists it as past producer for Copper. Minerals mentioned: Copper. Approx. location 40.781, -74.216. USGS record.
Ask first: a USGS record doesn’t mean you can visit. Find out who owns the land and get permission before collecting.
Field cards: what kind of sites?
Produced ore or material at some point in the past.
Status not recorded.
The mineral was noted here, without development.
Status terms come from USGS MRDS records.
Mineral cards
Copper
Mohs 2.5–3. Native copper is soft and turns green as it weathers. Mindat
6 sites
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
Minerals recorded here
Chalcocite 2Chrysocolla 1Commodities
Copper 6REE 3Sites
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Dod Mine | Copper | Chalcocite | Past Producer | 40.781, -74.216 |
| Glen Ridge Mine | Copper | Chalcocite, Chrysocolla | Past Producer | 40.799, -74.202 |
| Wigwam Brook Mine | Copper | — | Occurrence | 40.781, -74.230 |
| 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 |
| Ronson Metals/ Newark, N.J. | REE | — | Unknown | 40.725, -74.183 |
| Inorganic Chemical Crp/Bellville Nj | REE | — | Unknown | 40.786, -74.170 |
| Westinghouse Elec./Bloomfield, N.J. | REE | — | Unknown | 40.808, -74.187 |
Fossil collections
The Paleobiology Database lists 15 fossil collection records in Essex County. These are research records, not public dig sites.
Nearby counties
Hudson County · Bergen County · Union County · Middlesex County · Morris County
New Jersey mineral guides
- Quartz in New Jersey
- Garnet in New Jersey
- Mica in New Jersey
- Feldspar in New Jersey
- Magnetite in New Jersey
- Pyrite in New Jersey
Back to all New Jersey counties.
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