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Twin Springs - Site 1: Agate & Jasper Rockhounding in Malheur County, Oregon

Updated August 2026

Twin Springs - Site 1 is a mapped rockhounding spot in Malheur County, Oregon. Reported finds include agate, jasper, petrified wood, chalcedony, calcite, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Map showing Twin Springs - Site 1 in Malheur County, Oregon

Quick details

Access
Check locally
State
Oregon
Nearest road
Dry Creek Road

Geology at Twin Springs - Site 1

This spot sits on Oregon-Idaho Graben, mapped as basalt flows, black, gray, basaltic andesite flows, and gray; plagioclase hypersthene olivine phenocrysts; mineralogy: hypersthene olivine that formed roughly 23 to 5 million years ago. Volcanic rock like this is classic geode and thunderegg country: gas cavities in the old flows can line themselves with quartz or agate over time.

Mapped unit
Oregon-Idaho Graben
Age
23–5 Ma (Miocene)
Rock types
basalt flows, black, gray, basaltic andesite flows, and gray; plagioclase hypersthene olivine phenocrysts; mineralogy: hypersthene olivine
Elevation
3,120 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 Twin Springs - Site 1

Best months: February to June. Typical highs run 92°F in midsummer and 37°F in midwinter, with winter lows near 19°F.

Climate normals: NOAA 1991-2020 monthlies, OWYHEE DAM station (9 mi away), adjusted for elevation.

Land & collecting status

Confirm rules before collecting

Land status here is not confirmed. Verify with the managing agency before collecting — federal, state, and tribal rules differ.

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:

Found at Twin Springs - Site 1

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 Twin Springs - Site 1.

Across the state line from Twin Springs - Site 1

Twin Springs - Site 1 is close enough to the Oregon border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Twin Springs - Site 1 FAQ

Where is Twin Springs - Site 1?+
Twin Springs - Site 1 is in Malheur County, Oregon, at 43.60190, -117.41080. Nearest road: Dry Creek Road.
What rocks and minerals can you find at Twin Springs - Site 1?+
Twin Springs - Site 1 is reported to produce Agate, Jasper, Petrified Wood, Chalcedony, Calcite, Geode.
Is collecting allowed at Twin Springs - Site 1?+
Confirm rules before collecting. Land status here is not confirmed. Verify with the managing agency before collecting — federal, state, and tribal rules differ. Always confirm current rules with the managing agency before a trip.
What tools should I bring to Twin Springs - Site 1?+
Bring a crack hammer, a chisel, safety glasses, and a bucket. Candidates are rounder and lighter than solid rock; a soil pipe cutter opens them cleaner than a flat smash.
When is the best time to visit Twin Springs - Site 1?+
The most comfortable months at Twin Springs - Site 1 are February to June.
How do I get to Twin Springs - Site 1?+
Open the directions link to navigate to 43.60190, -117.41080 in Google Maps. The nearest road is Dry Creek Road.

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