Rainbow Ridge Opal Mine: Precious Opal & Black Opal Rockhounding in Humboldt County, Nevada

Plan your visit

Generally open to casual rockhounding

County

Humboldt County

State

Nevada

Nearest road

Sagebrush Creek Road

Coordinates

41.79747, -119.01517

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

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.

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 Rainbow Ridge Opal Mine

Comfortable months (45 to 90°F highs)

Best months: February to June. Typical highs run 91°F in midsummer and 40°F in midwinter, with winter lows near 18°F.

Climate normals: NOAA 1991-2020 monthlies, DENIO station (24 mi away), adjusted for elevation.

Geology at Rainbow Ridge Opal Mine

This spot sits on Younger tuffaceous sedimentary rocks, mapped as sedimentary and volcanic that formed roughly 23 to 3 million years ago. Petrified wood typically comes from volcanic ash beds like the ones associated with this ground, where buried forests were slowly replaced by silica.

Mapped unit

Younger tuffaceous sedimentary rocks

Age

23–3 Ma (Miocene to Pliocene)

Rock types

sedimentary and volcanic

Elevation

5,100 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

• BLM Nevada, Recreation
• Nevada Bureau of Mines and Geology
• Royal Peacock Opal Mine (fee-dig operator)
• Community submissions reviewed against published agency rules