Best spot

Seminoe Reservoir: Jade Rockhounding in Carbon County, Wyoming

Updated June 2026

Seminoe Reservoir represents the Seminoe Mountains side of Wyoming's jade and lapidary-rock story, with WSGS noting silicified banded iron formation from the Seminoe Mountains alongside the state's better-known jade resources. It earns a top-10 place because it broadens the Wyoming set into Carbon County while staying tied to a distinctive hard, polishable material. Reported finds include jade. Below: coordinates, access notes, nearby spots, and trip-planning links.

Seminoe Reservoir photos

Public image records connected to this spot or its reported material.

6 photos

Quick details

Access: Public area
County: Carbon County
State: Wyoming
Coordinates: 41.88919, -106.97522

Geology at Seminoe Reservoir

This spot sits on Alluvium and Colluvium, mapped as clay, silt, and sand that formed within roughly the last 3 million years. Loose deposits like these are float-collecting ground: erosion keeps moving durable rocks and minerals into gravel bars, cutbanks, and washes.

Mapped unit: Alluvium and Colluvium
Age: 3 Ma to present (Pleistocene to Holocene)
Rock types: clay, silt, and sand
Elevation: 6,370 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 Seminoe Reservoir

Best months: March to October. Typical highs run 87°F in midsummer and 33°F in midwinter, with winter lows near 15°F.

Climate normals: NOAA 1991-2020 monthlies, RAWLINS AP station (13 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: April 1, 2026

BLM Wyoming
Wyoming State Geological Survey
Fossil Butte National Monument
Community submissions reviewed against published agency rules

Found at Seminoe Reservoir

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Jade Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Seminoe Reservoir.

Seminoe Reservoir FAQ

Where is Seminoe Reservoir?+

Seminoe Reservoir is in Carbon County, Wyoming, at 41.88919, -106.97522.

What rocks and minerals can you find at Seminoe Reservoir?+

Seminoe Reservoir is reported to produce Jade.

Is collecting allowed at Seminoe Reservoir?+

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 Seminoe Reservoir?+

A rock hammer, sturdy gloves, safety glasses, and a collecting bag cover the basics here. Add a spray bottle: wet rock shows color and pattern that dry rock hides.

When is the best time to visit Seminoe Reservoir?+

The most comfortable months at Seminoe Reservoir are March to October.

How do I get to Seminoe Reservoir?+

Open the directions link to navigate to 41.88919, -106.97522 in Google Maps. Some spots are remote, so check road conditions before driving out.

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