Corbin: Arsenopyrite & Cerussite Rockhounding in Jefferson County, Montana

Updated June 2026

Corbin is a mapped rockhounding spot in Jefferson County, Montana. Reported finds include arsenopyrite, cerussite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Jefferson County
State: Montana
Nearest road: Powder House Road
Coordinates: 46.39265, -112.08312

Geology at Corbin

This spot sits on Boulder batholith, Butte Quartz Monzonite, mapped as quartz monzonite and monzogranite-to-granodiorite that formed roughly 100 to 66 million years ago. Plutonic rock like this weathers slowly into grus and boulders, and the most productive collecting is typically in weathered zones and drainages.

Mapped unit: Boulder batholith, Butte Quartz Monzonite
Age: 100–66 Ma (Late Cretaceous)
Rock types: quartz monzonite and monzogranite-to-granodiorite
Elevation: 5,680 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 Corbin

Best months: April to October. Typical highs run 78°F in midsummer and 32°F in midwinter, with winter lows near 7°F.

Climate normals: NOAA 1991-2020 monthlies, TIZER GARDENS station (3 mi away), adjusted for elevation.

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.

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 Montana — Recreational mineral collecting
Montana Bureau of Mines and Geology
Gem Mountain Sapphire Mine (fee-dig operator)
Community submissions reviewed against published agency rules

Found at Corbin

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 Corbin.

Corbin FAQ

Where is Corbin?+

Corbin is in Jefferson County, Montana, at 46.39265, -112.08312. Nearest road: Powder House Road.

What rocks and minerals can you find at Corbin?+

Corbin is reported to produce Arsenopyrite, Cerussite.

Is collecting allowed at Corbin?+

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. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Corbin?+

A rock hammer, gloves, and safety glasses cover old mining-district ground. Stay out of shafts and adits; the best specimens typically come from dump piles.

When is the best time to visit Corbin?+

The most comfortable months at Corbin are April to October.

How do I get to Corbin?+

Open the directions link to navigate to 46.39265, -112.08312 in Google Maps. The nearest road is Powder House Road.

More rockhounding in Montana

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Open Corbin on the map

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