Eagle Pass: Agate & Amber Rockhounding in Maverick County, Texas

Updated June 2026

Eagle Pass is a mapped rockhounding spot in Maverick County, Texas. Reported finds include agate, amber, chalcedony, jasper. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Maverick County
State: Texas
Nearest road: Stone Hill
Postcode: 78852
Coordinates: 28.73735, -100.47120

Geology at Eagle Pass

This spot sits on ground mapped as Escondito Formation that formed roughly 100 to 66 million years ago. Tough silica like agate and jasper typically survives weathering and collects as float in drainages and gravel.

Mapped unit: Escondito Formation
Age: 100–66 Ma (Late Cretaceous)
Elevation: 810 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 Eagle Pass

Best months: October to May. Typical highs run 97°F in midsummer and 64°F in midwinter, with winter lows near 40°F. Summer heat here is intense, so carry more water than you think you need and work the early morning.

Climate normals: NOAA 1991-2020 monthlies, EAGLE PASS 3N station (1 mi away).

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

Texas Parks and Wildlife Department
Bureau of Economic Geology — Texas geology
Big Bend National Park — Rules
Community submissions reviewed against published agency rules

Found at Eagle Pass

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 Eagle Pass.

Eagle Pass FAQ

Where is Eagle Pass?+

Eagle Pass is in Maverick County, Texas, at 28.73735, -100.47120. Nearest road: Stone Hill.

What rocks and minerals can you find at Eagle Pass?+

Eagle Pass is reported to produce Agate, Amber, Chalcedony, Jasper.

Is collecting allowed at Eagle Pass?+

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 Eagle Pass?+

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 Eagle Pass?+

The most comfortable months at Eagle Pass are October to May. Summer heat here is intense, so carry more water than you think you need and work the early morning.

How do I get to Eagle Pass?+

Open the directions link to navigate to 28.73735, -100.47120 in Google Maps. The nearest road is Stone Hill.

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