Adams County: Gold Prospecting in Adams County, Idaho

Plan your visit

Confirm rules before collecting

County

Adams County

State

Idaho

Nearest road

National Forest Development Road 122

Coordinates

44.89181, -116.63878

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

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.

Access note: BLM records active mining claims in this area. Collecting from inside an active claim needs the claim holder's permission.

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.

Best time to visit Adams County

Comfortable months (45 to 90°F highs)

Best months: March to October. Typical highs run 85°F in midsummer and 29°F in midwinter, with winter lows near 17°F.

Climate normals: NOAA 1991-2020 monthlies, BROWNLEE DAM station (13 mi away), adjusted for elevation.

Geology at Adams County

This spot sits on Blue Mountains island arc, Olds Ferry terrane, Huntington Formation, mapped as greenstone volcaniclastic sandstone, volcaniclastic conglomerate, greenstone andesite tuffs, greenstone andesite flows, dacite, and keratophyre that formed roughly 250 to 200 million years ago. Gold in volcanic terrain like this is usually tied to old vein systems and the gravels that drain them, so nearby washes tend to carry the color.

Mapped unit

Blue Mountains island arc, Olds Ferry terrane, Huntington Formation

Age

250–200 Ma (Triassic)

Rock types

greenstone volcaniclastic sandstone, volcaniclastic conglomerate, greenstone andesite tuffs, greenstone andesite flows, dacite, and keratophyre

Elevation

4,650 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.

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

• Idaho Panhandle National Forests, Emerald Creek
• Idaho Geological Survey
• Spencer Opal Mines (fee-dig operator)
• Community submissions reviewed against published agency rules