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Jay Em: Agate & Malachite Rockhounding in Goshen County, Wyoming

Public access3 mineralsGoshen County, WyomingUpdated June 2026
Minerals reported
3
Elevation
4,660 ft
Best months
March to November

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.

Plan your visit

Generally open to casual rockhounding

State
Wyoming
Nearest road
US Highway 85
Get directionsView on Google Maps

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

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.

Best time to visit Jay Em

Comfortable months (45 to 90°F highs)

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.

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.

Today's weather

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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:

Found at Jay Em

Each name 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.

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.

Jay Em FAQ

Where is Jay Em?+
Jay Em is in Goshen County, Wyoming, at 42.46400, -104.36364. Nearest road: US Highway 85.
What rocks and minerals can you find at Jay Em?+
Jay Em is reported to produce Agate, Malachite, Onyx.
Is collecting allowed at Jay Em?+
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. Always confirm current rules with the managing agency before a trip.
What tools should I bring to Jay Em?+
Most agate and jasper is surface float: bring a spray bottle, a pick or small shovel, and a sturdy bag. Wet stones show their banding and translucence.
When is the best time to visit Jay Em?+
The most comfortable months at Jay Em are March to November.
How do I get to Jay Em?+
Open the directions link to navigate to 42.46400, -104.36364 in Google Maps. The nearest road is US Highway 85.

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