Mazon River — Rockhounding in Grundy County, Illinois
Mazon River is a mapped rockhounding spot in Grundy County, Illinois. Reported finds include fossils. Below: coordinates, access notes, nearby spots, and trip-planning links.
Map showing Mazon River in Grundy County, Illinois
Quick details
- Access
- Public area
- County
- Grundy County
- State
- Illinois
- Coordinates
- 41.29336, -88.36670
Land & collecting status
Generally open to casual rockhounding
Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.
Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.
Nearby rockhounding spots
Other rockhounding spots within driving distance of Mazon River.
- Coal CityWill County · 9 mi awayConcretions With Fossils
- East BrooklynGrundy County · 11 mi awayMarcasite, Pyrite
- North AuroraKane County · 35 mi awayBornite, Calcite, Chalcopyrite
- Bishop HillHenry County · 91 mi awayAgate, Jasper
- Rapatee Strip MineFulton County · 101 mi awayPyritized Gastropods
- CordovaRock Island County · 105 mi awayAgate
Mazon River FAQ
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More rockhounding in Illinois
See all 29 Illinois spots →Open Mazon River on the map
Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.
