Calvert Hill Mine: Scheelite & Garnet Rockhounding in Beaverhead County, Montana

Plan your visit

Generally open to casual rockhounding

County

Beaverhead County

State

Montana

Nearest road

Calvert Loop Road

Coordinates

45.84889, -113.15242

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

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.

Access note: Check public access and claim status before visiting; stay out of old workings and collect only surface material where lawful.

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.

Best time to visit Calvert Hill Mine

Comfortable months (45 to 90°F highs)

Best months: April to October. Typical highs run 74°F in midsummer and 26°F in midwinter, with winter lows near 3°F. At about 7,170 ft, snow can block access from late fall well into spring, so check conditions outside of summer.

Climate normals: NOAA 1991-2020 monthlies, WISE RVR 3 WNW station (8 mi away), adjusted for elevation.

Geology at Calvert Hill Mine

This spot sits on Pioneer batholith, granodiorite, tonalite, and quartz diorite, mapped as hornblende-biotite granodiorite, biotite tonalite, biotite-hornblende tonalite, quartz diorite, and granitic rocks that formed roughly 100 to 66 million years ago. Granitic rock like this is where pegmatite pockets tend to occur, the coarse-crystal settings that typically carry beryl, tourmaline, mica, and feldspar.

Mapped unit

Pioneer batholith, granodiorite, tonalite, and quartz diorite

Age

100–66 Ma (Late Cretaceous)

Rock types

hornblende-biotite granodiorite, biotite tonalite, biotite-hornblende tonalite, quartz diorite, and granitic rocks

Elevation

7,170 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.

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