RockWoof
Check access before you go. Most sites listed here are old mines, quarries or prospects, and many are on private land or active mining claims. Get the landowner's permission, check the rules of the agency that manages any public land, and never enter mine workings. Locations are approximate.

Sketch map

Joliet Phos-Acid Plant + 1 more nearby (Plant)U S Refactories Div. Mill (Producer)Barbers Corners Plant (Plant)(Facility) Union 76 Chicago Refinery (Plant)Texaco Lockport Plant + 1 more nearby (Producer)
Past ProducerProducerProspectOccurrenceStatus unknown
5 paw pins; nearby sites are grouped into one pin. Hover or tap a pin for the site name. County outline: US Census Bureau cartographic boundary file (2023). Locations approximate.

Field cards: what kind of sites?

4
Plant

A processing plant site.

2
Producer

Was producing when the record was made.

1
Past Producer

Produced ore or material at some point in the past.

Status terms come from USGS MRDS records.

Minerals recorded here

No individual minerals are listed in these records.

Commodities

Sulfur 3Phosphorus-Phosphates 2Magnesite 1

Sites

SiteCommodityMinerals recordedStatusApprox. location
Joliet Phos-Acid PlantPhosphorus-Phosphates—Plant41.481, -88.131
(Facility) Union 76 Chicago RefinerySulfur—Plant41.653, -88.042
Barbers Corners Plant——Plant41.724, -88.084
U S Refactories Div. MillMagnesite—Producer41.504, -88.113
Joliet Phosphoric Acid PlantPhosphorus-Phosphates—Past Producer41.481, -88.131
Texaco Lockport Plant——Producer41.608, -88.058
(Facility) Mobil Oil Joilet Refinery——Plant41.601, -88.058

Fossil collections

The Paleobiology Database lists 7 fossil collection records in Will County. These are research records, not public dig sites.

Nearby counties

Grundy County · DuPage County · Cook County · Kane County · Kankakee County

Illinois mineral guides

Back to all Illinois 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 USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date.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