Duchesne County: Analcite & Anhydrite Rockhounding in Duchesne County, Utah

Updated July 2026

Duchesne County is a mapped rockhounding spot in Duchesne County, Utah. Reported finds include analcite, anhydrite, crocidolite, fluorapatite, illite, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Permission required
County: Duchesne County
State: Utah
Nearest road: West Main Street
Postcode: 84021
Coordinates: 40.16339, -110.40143

Geology at Duchesne County

This spot sits on Alluvium, mapped as boulder to pebble gravel, sand, silt, and clay that formed within roughly the last 12,000 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
Age: < 1 Ma (Holocene)
Rock types: boulder to pebble gravel, sand, silt, and clay
Elevation: 5,530 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 Duchesne County

Best months: March to November. Typical highs run 89°F in midsummer and 33°F in midwinter, with winter lows near 11°F.

Climate normals: NOAA 1991-2020 monthlies, DUCHESNE station (1 mi away).

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 Utah — Rockhounding overview
Utah Geological Survey — collecting guidelines
SITLA — surface use rules
Community submissions reviewed against published agency rules

Found at Duchesne County

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 Duchesne County.

Duchesne County FAQ

Where is Duchesne County?+

Duchesne County is in Duchesne County, Utah, at 40.16339, -110.40143. Nearest road: West Main Street.

What rocks and minerals can you find at Duchesne County?+

Duchesne County is reported to produce Analcite, Anhydrite, Crocidolite, Fluorapatite, Illite, Pyrite, Bassanite, Dawsonite, Riebeckite, Shortite.

Is collecting allowed at Duchesne County?+

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 Duchesne County?+

A rock hammer, gloves, and safety glasses cover old mining-district ground. Stay out of shafts and adits; the best specimens typically come from dump piles.

When is the best time to visit Duchesne County?+

The most comfortable months at Duchesne County are March to November.

How do I get to Duchesne County?+

Open the directions link to navigate to 40.16339, -110.40143 in Google Maps. The nearest road is West Main Street.

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