Mount Blackmore — Rockhounding in Gallatin County, Montana

Mount Blackmore is a mapped rockhounding spot in Gallatin County, Montana. Reported finds include agate, chalcedony, hyalite opal, petrified wood. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Gallatin County
State: Montana
Nearest road: Blackmore Trail
Coordinates: 45.44473, -111.00348

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 Mount Blackmore

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 Mount Blackmore.

Mount Blackmore FAQ

Where is Mount Blackmore?+

Mount Blackmore is in Gallatin County, Montana, at 45.44473, -111.00348. Nearest road: Blackmore Trail.

What rocks and minerals can you find at Mount Blackmore?+

Mount Blackmore is reported to produce Agate, Chalcedony, Hyalite Opal, Petrified Wood.

Is collecting allowed at Mount Blackmore?+

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.

How do I get to Mount Blackmore?+

Open the directions link to navigate to 45.44473, -111.00348 in Google Maps. The nearest road is Blackmore Trail.

More rockhounding in Montana

See all 87 Montana spots →

Open Mount Blackmore on the map

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