Bemis Stream Prospect: Albite & Beryl Rockhounding in Franklin County, Maine

Plan your visit

Generally open to casual rockhounding

County

Franklin County

State

Maine

Nearest road

Bemis Road

Coordinates

44.82414, -70.71685

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.

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 Bemis Stream Prospect

Comfortable months (45 to 90°F highs)

Best months: April to October. Typical highs run 75°F in midsummer and 23°F in midwinter, with winter lows near 2°F.

Climate normals: NOAA 1991-2020 monthlies, MIDDLE DAM station (10 mi away), adjusted for elevation.

Geology at Bemis Stream Prospect

This spot sits on Rangeley Formation, "B" member, mapped as conglomerate that formed roughly 445 to 435 million years ago. Sedimentary rock like this erodes unevenly, so the most productive collecting is typically along fresh cuts, badland slopes, and active drainages.

Mapped unit

Rangeley Formation, "B" member

Age

445–435 Ma (Llandovery)

Rock types

conglomerate

Elevation

1,710 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

• Maine Geological Survey
• Maine Mineral & Gem Museum
• Acadia National Park rules
• Community submissions reviewed against published agency rules