Casper: Beryl & Muscovite Rockhounding in Natrona County, Wyoming

Updated July 2026

Casper is a mapped rockhounding spot in Natrona County, Wyoming. Reported finds include beryl, muscovite, tourmaline. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Permission required
County: Natrona County
State: Wyoming
Nearest road: Ponderosa Road
Coordinates: 42.71405, -106.25597

Geology at Casper

This spot sits on ground mapped as Casper Formation that formed roughly 315 to 275 million years ago. Coarse pegmatite minerals typically weather out of their dikes and concentrate in the soils directly downslope.

Mapped unit: Casper Formation
Age: 315–275 Ma (Middle Pennsylvanian to Early Permian)
Elevation: 6,930 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 Casper

Best months: April to October. Typical highs run 80°F in midsummer and 31°F in midwinter, with winter lows near 9°F.

Climate normals: NOAA 1991-2020 monthlies, BATES CREEK #2 station (8 mi away), adjusted for elevation.

Land & collecting status

Permission required before collecting

Requires landowner or agency permission before any collecting. Do not enter without explicit authorization.

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 Casper

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 Casper.

Casper FAQ

Where is Casper?+

Casper is in Natrona County, Wyoming, at 42.71405, -106.25597. Nearest road: Ponderosa Road.

What rocks and minerals can you find at Casper?+

Casper is reported to produce Beryl, Muscovite, Tourmaline.

Is collecting allowed at Casper?+

Permission required before collecting. Requires landowner or agency permission before any collecting. Do not enter without explicit authorization. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Casper?+

A rock hammer, a pry bar, gloves, and safety glasses suit pegmatite ground. Work weathered zones and check dump piles; coarse crystals often sit in decomposed rock.

When is the best time to visit Casper?+

The most comfortable months at Casper are April to October.

How do I get to Casper?+

Open the directions link to navigate to 42.71405, -106.25597 in Google Maps. The nearest road is Ponderosa Road.

More rockhounding in Wyoming

See all 82 Wyoming spots →

Open Casper on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.