Caballo Mountains: Azurite & Chalcocite Rockhounding in Sierra County, New Mexico

Updated June 2026

Caballo Mountains is a mapped rockhounding spot in Sierra County, New Mexico. Reported finds include azurite, chalcocite, chalcopyrite, fluorite, malachite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Sierra County
State: New Mexico
Nearest road: County Road A003
Coordinates: 32.91197, -107.22360

Geology at Caballo Mountains

This spot sits on ground mapped as sedimentary that formed roughly 540 to 420 million years ago. Sedimentary rock like this erodes unevenly, so the most productive collecting is typically along fresh cuts, badland slopes, and active drainages.

Age: 540–420 Ma (Cambrian to Silurian)
Rock types: sedimentary
Elevation: 5,640 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 Caballo Mountains

Best months: August to May. Typical highs run 92°F in midsummer and 54°F in midwinter, with winter lows near 24°F.

Climate normals: NOAA 1991-2020 monthlies, CABALLO DAM station (5 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

Rockhound State Park — Collection rules
BLM New Mexico
New Mexico Bureau of Geology and Mineral Resources
Community submissions reviewed against published agency rules

Found at Caballo Mountains

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 Caballo Mountains.

Caballo Mountains FAQ

Where is Caballo Mountains?+

Caballo Mountains is in Sierra County, New Mexico, at 32.91197, -107.22360. Nearest road: County Road A003.

What rocks and minerals can you find at Caballo Mountains?+

Caballo Mountains is reported to produce Azurite, Chalcocite, Chalcopyrite, Fluorite, Malachite.

Is collecting allowed at Caballo Mountains?+

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 Caballo Mountains?+

A rock hammer, gloves, and safety glasses are enough for oxidized copper ground. Look for green and blue staining on weathered rock and in old dump piles.

When is the best time to visit Caballo Mountains?+

The most comfortable months at Caballo Mountains are August to May.

How do I get to Caballo Mountains?+

Open the directions link to navigate to 32.91197, -107.22360 in Google Maps. The nearest road is County Road A003.

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