Greenfire Opal Mine: Opal & Black Opal Rockhounding in Humboldt County, Nevada

Updated June 2026

Greenfire Opal Mine is a mapped rockhounding spot in Humboldt County, Nevada. Reported finds include opal, black opal, fire opal, common opal. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Permission required
County: Humboldt County
State: Nevada
Nearest road: Sagebrush Creek Road
Coordinates: 41.81482, -119.00795

Geology at Greenfire 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 is where agate, jasper, and other chalcedony typically form, filling old gas pockets and fracture seams in the flow rock.

Mapped unit: Younger tuffaceous sedimentary rocks
Age: 23–3 Ma (Miocene to Pliocene)
Rock types: sedimentary and volcanic
Elevation: 4,900 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 Greenfire Opal Mine

Best months: February to June. Typical highs run 92°F in midsummer and 41°F in midwinter, with winter lows near 19°F.

Climate normals: NOAA 1991-2020 monthlies, DENIO station (23 mi away), adjusted for elevation.

Land & collecting status

Permission required before collecting

Requires landowner or agency permission before any collecting. Do not enter without explicit authorization.

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

Found at Greenfire Opal Mine

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 Greenfire Opal Mine.

Across the state line from Greenfire Opal Mine

Greenfire Opal Mine is close enough to the Nevada border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Greenfire Opal Mine FAQ

Where is Greenfire Opal Mine?+

Greenfire Opal Mine is in Humboldt County, Nevada, at 41.81482, -119.00795. Nearest road: Sagebrush Creek Road.

What rocks and minerals can you find at Greenfire Opal Mine?+

Greenfire Opal Mine is reported to produce Opal, Black Opal, Fire Opal, Common Opal.

Is collecting allowed at Greenfire Opal Mine?+

Permission required before collecting. Requires landowner or agency permission before any collecting. Do not enter without explicit authorization. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Greenfire Opal Mine?+

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 Greenfire Opal Mine?+

The most comfortable months at Greenfire Opal Mine are February to June.

How do I get to Greenfire Opal Mine?+

Open the directions link to navigate to 41.81482, -119.00795 in Google Maps. The nearest road is Sagebrush Creek Road.

More rockhounding in Nevada

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Open Greenfire Opal Mine on the map

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