Gardiner: Gold Prospecting in Park County, Montana

Updated June 2026

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

Quick details

Access: Public area
County: Park County
State: Montana
Nearest road: Sin Nombre Road
Coordinates: 45.04432, -110.60634

Geology at Gardiner

This spot sits on Wyoming Province, metasedimentary rocks, schist and hornfels, Stillwater and South Snowy block areas, mapped as schist, hornblende hornfels, and pyroxene hornfels that formed roughly 4030 to 2500 million years ago. Gold in metamorphic belts like this is typically tied to quartz veins and shear zones, with placer color in the creeks that cut them.

Mapped unit: Wyoming Province, metasedimentary rocks, schist and hornfels, Stillwater and South Snowy block areas
Age: 4030–2500 Ma (Archean)
Rock types: schist, hornblende hornfels, and pyroxene hornfels
Elevation: 8,340 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 Gardiner

Best months: April to October. Typical highs run 76°F in midsummer and 24°F in midwinter, with winter lows near 6°F. At about 8,340 ft, snow can block access from late fall well into spring, so check conditions outside of summer.

Climate normals: NOAA 1991-2020 monthlies, GARDINER station (5 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 Gardiner

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 Gardiner.

Across the state line from Gardiner

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

Gardiner FAQ

Where is Gardiner?+

Gardiner is in Park County, Montana, at 45.04432, -110.60634. Nearest road: Sin Nombre Road.

What rocks and minerals can you find at Gardiner?+

Gardiner is reported to produce Arsenopyrite, Gold.

Is collecting allowed at Gardiner?+

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 Gardiner?+

A gold pan, a classifier screen, a small shovel, and a snuffer bottle cover the basics. Motorized equipment and sluices fall under separate rules in most states, so start with hand tools.

When is the best time to visit Gardiner?+

The most comfortable months at Gardiner are April to October. At about 8,340 ft, snow can block access from late fall well into spring, so check conditions outside of summer.

How do I get to Gardiner?+

Open the directions link to navigate to 45.04432, -110.60634 in Google Maps. The nearest road is Sin Nombre Road.

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