Rainbow Ridge Opal Mine: Rockhounding in Humboldt County, Nevada

Quick details

Access

Paid / fee dig

County

Humboldt County

State

Nevada

Nearest road

Sagebrush Creek Road

Coordinates

41.79519, -119.01438

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. Volcanic ground like this weathers into rocky slopes and float, and fresh exposures in cuts and drainages are usually the most productive places to look.

Mapped unit

Younger tuffaceous sedimentary rocks

Age

23–3 Ma (Miocene to Pliocene)

Rock types

sedimentary and volcanic

Elevation

5,110 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 Rainbow Ridge Opal Mine

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.

Land & collecting status

Pay-to-dig site

This is a fee-dig location. Hours, prices, and what you can keep vary by operator. Call ahead before driving out.

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

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