Guernsey Platte River: Agate & Chalcedony Rockhounding in Goshen County, Wyoming
Updated August 2026
Guernsey Platte River is a mapped rockhounding spot in Goshen County, Wyoming. Reported finds include agate, chalcedony, banded iron formation, jasper. Below: coordinates, access notes, nearby spots, and trip-planning links.
Map showing Guernsey Platte River in Goshen County, Wyoming
Quick details
- Access
- Public area
- County
- Goshen County
- State
- Wyoming
- Nearest road
- Road 3
- Coordinates
- 42.24746, -104.63111
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.
Sources & verification
Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.
State guidance last verified:
- BLM Wyoming
- Wyoming State Geological Survey
- Fossil Butte National Monument
- Community submissions reviewed against published agency rules
Found at Guernsey Platte River
Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.
Nearby rockhounding spots
Other rockhounding spots within driving distance of Guernsey Platte River.
- SunrisePlatte County, Wyoming · 7 mi awayArsenopyrite, Barite, Copper
- HartvilleTop pick in WyomingPlatte County, Wyoming · 8 mi awayAgate, Moss Agate, Chalcedony
- Jay EmGoshen County, Wyoming · 20 mi awayAgate, Malachite, Onyx
- Rawhide ButtesGoshen County, Wyoming · 25 mi awayAzurite, Bornite, Chalcocite
- Glendo Red HillsPlatte County, Wyoming · 28 mi awayBanded Iron Formation
- Cooney HillsPlatte County, Wyoming · 31 mi awayGarnet
- WheatlandPlatte County, Wyoming · 32 mi awayMoonstone, Labradorite
- Chugwater CreekLaramie County, Wyoming · 50 mi awayBloodstone
Across the state line from Guernsey Platte River
Guernsey Platte River is close enough to the Wyoming border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.
- Agate Fossil BedsSioux County, Nebraska · 48 mi awayAgate, Jasper, Chalcedony
- Scottsbluff BadlandsScotts Bluff County, Nebraska · 55 mi awayFossil
- Sioux CountySioux County, Nebraska · 58 mi awayChalcedony, Celestite, Fossil
- MontroseTop pick in NebraskaSioux County, Nebraska · 65 mi awayAgate, Jasper, Fossil
- Little BadlandsSioux County, Nebraska · 68 mi awayVertebrate Fossil
- Crawford (jasper area)Dawes County, Nebraska · 69 mi awayFairburn Agate, Jasper, Petrified Wood
Guernsey Platte River FAQ
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More rockhounding in Wyoming
See all 92 Wyoming spots →Open Guernsey Platte River on the map
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