RockWoofSketch map
Woof’s favorite find
Wilmington Plantozark-Mahoning
We picked it because its USGS record mentions 1 gem or collectible mineral (Fluorite) and 1 of our card minerals overall. No other named site here scores as high on both counts. USGS lists it as plant for Fluorine-Fluorite. Minerals mentioned: Fluorite. Approx. location 39.750, -75.555. 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?
A processing plant site.
Produced ore or material at some point in the past.
Status terms come from USGS MRDS records.
Mineral cards
Fluorite
Mohs 4. Cubes in purple, green or yellow; many glow under UV. Mindat
1 site
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
Minerals recorded here
No individual minerals are listed in these records.
Commodities
Iron 3Titanium 2Sulfur 1Chromium 1Aluminum 1Fluorine-Fluorite 1Pigment 1Sites
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Chestnut Hill Mine | Iron | — | Past Producer | 39.653, -75.772 |
| Iron Hill Mine | Iron | — | Past Producer | 39.641, -75.755 |
| Delaware Plant Getty | Sulfur | — | Plant | 39.575, -75.598 |
| American Minerals/ Wilmington, De. | Chromium | — | Past Producer | 39.750, -75.555 |
| Wilmington Plant Dupont | Titanium | — | Plant | 39.750, -75.555 |
| New Castle Plant C-E Minerals | Aluminum | — | Plant | 39.661, -75.567 |
| Wilmington Plantozark-Mahoning | Fluorine-Fluorite | — | Plant | 39.750, -75.555 |
| Edgemoor Plant Ti | Titanium, Pigment | — | Plant | 39.747, -75.500 |
| Phoenix Steel/ Claymont, De. | Iron | — | Plant | 39.808, -75.443 |
Fossil collections
The Paleobiology Database lists 45 fossil collection records in New Castle County. These are research records, not public dig sites.
Nearby counties
Back to all Delaware 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 USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date.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