Dog Valley: Chalcedony & Fluorite Rockhounding in Millard County, Utah

Updated June 2026

Dog Valley is a mapped rockhounding spot in Millard County, Utah. Reported finds include chalcedony, fluorite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Millard County
State: Utah
Coordinates: 38.66477, -112.57985

Geology at Dog Valley

This spot sits on ground mapped as Younger alluvial-fan deposits that formed within roughly the last 129,000 years. Gravels like these concentrate whatever survives the river: agate, jasper, and other tough silica typically show up as rounded, waxy stones.

Mapped unit: Younger alluvial-fan deposits
Age: < 1 Ma (Late Pleistocene to Holocene)
Elevation: 5,710 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 Dog Valley

Best months: March to November. Typical highs run 88°F in midsummer and 36°F in midwinter, with winter lows near 17°F.

Climate normals: NOAA 1991-2020 monthlies, KANOSH station (12 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 Dog Valley

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 Dog Valley.

Dog Valley FAQ

Where is Dog Valley?+

Dog Valley is in Millard County, Utah, at 38.66477, -112.57985.

What rocks and minerals can you find at Dog Valley?+

Dog Valley is reported to produce Chalcedony, Fluorite.

Is collecting allowed at Dog Valley?+

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 Dog Valley?+

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 Dog Valley?+

The most comfortable months at Dog Valley are March to November.

How do I get to Dog Valley?+

Open the directions link to navigate to 38.66477, -112.57985 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Utah

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Open Dog Valley on the map

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