Jay Em: Agate & Malachite Rockhounding in Goshen County, Wyoming
Updated June 2026
Jay Em is a mapped rockhounding spot in Goshen County, Wyoming. Reported finds include agate, malachite, onyx. Below: coordinates, access notes, nearby spots, and trip-planning links.
Map showing Jay Em in Goshen County, Wyoming
Quick details
- Access
- Public area
- County
- Goshen County
- State
- Wyoming
- Nearest road
- US Highway 85
- Coordinates
- 42.46400, -104.36364
Geology at Jay Em
This spot sits on ground mapped as Arikaree Formation that formed roughly 34 to 16 million years ago. Tough silica like agate and jasper typically survives weathering and collects as float in drainages and gravel.
- Mapped unit
- Arikaree Formation
- Age
- 34–16 Ma (Oligocene to Early Miocene)
- Elevation
- 4,660 ft
Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.
Best time to visit Jay Em
Best months: March to November. Typical highs run 88°F in midsummer and 37°F in midwinter, with winter lows near 14°F.
Climate normals: NOAA 1991-2020 monthlies, TORRINGTON 29N station (11 mi away), adjusted for elevation.
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 Jay Em
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 Jay Em.
- Rawhide ButtesGoshen County, Wyoming · 12 mi awayAzurite, Bornite, Chalcocite
- SunrisePlatte County, Wyoming · 19 mi awayArsenopyrite, Barite, Copper
- HartvilleTop pick in WyomingPlatte County, Wyoming · 22 mi awayAgate, Moss Agate, Chalcedony
- Cooney HillsPlatte County, Wyoming · 51 mi awayGarnet
- WheatlandPlatte County, Wyoming · 53 mi awayMoonstone, Labradorite
- Moss Agate HillConverse County, Wyoming · 68 mi awayMoss Agate, Chalcedony, Jasper
- Chugwater CreekLaramie County, Wyoming · 70 mi awayBloodstone
- Converse CountyConverse County, Wyoming · 73 mi awayCopper, Chalcopyrite
Across the state line from Jay Em
Jay Em 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 · 32 mi awayAgate, Jasper, Chalcedony
- Sioux CountySioux County, Nebraska · 40 mi awayChalcedony, Celestite, Fossils
- MontroseTop pick in NebraskaSioux County, Nebraska · 45 mi awayAgate, Jasper, Fossils
- Little BadlandsSioux County, Nebraska · 48 mi awayVertebrate Fossils
- Crawford (jasper area)Dawes County, Nebraska · 51 mi awayFairburn Agate, Jasper, Petrified Wood
- Crawford (Fairburn area)Top pick in NebraskaDawes County, Nebraska · 52 mi awayFairburn Agate
Jay Em FAQ
Where is Jay Em?+
What rocks and minerals can you find at Jay Em?+
Is collecting allowed at Jay Em?+
What tools should I bring to Jay Em?+
When is the best time to visit Jay Em?+
How do I get to Jay Em?+
More rockhounding in Wyoming
See all 82 Wyoming spots →Open Jay Em on the map
Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.
