Blawn Mountain: Alunite Rockhounding in Beaver County, Utah

Quick details

Access

Public area

County

Beaver County

State

Utah

Nearest road

Blawn Mountain Road

Coordinates

38.25455, -113.57937

Geology at Blawn Mountain

This spot sits on Pilot Shale, Guilmette Formation, and Simonson and Sevy Dolomites, mapped as dolostone and limestone that formed roughly 410 to 345 million years ago. Carbonate rock like this dissolves and weathers readily, so fresh road cuts, quarries, and creek exposures are typically the most productive ground.

Mapped unit

Pilot Shale, Guilmette Formation, and Simonson and Sevy Dolomites

Age

410–345 Ma (Early Devonian to Mississippian)

Rock types

dolostone and limestone

Elevation

8,190 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 Blawn Mountain

Best months: March to November. Typical highs run 84°F in midsummer and 33°F in midwinter, with winter lows near 2°F. At about 8,190 ft, snow can block access from late fall well into spring, so check conditions outside of summer.

Climate normals: NOAA 1991-2020 monthlies, WAH WAH RCH station (18 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 Utah — Rockhounding overview
• Utah Geological Survey — collecting guidelines
• SITLA — surface use rules
• Community submissions reviewed against published agency rules

Found at Blawn Mountain

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

• Alunite