Bumpus Quarry: Albite & Almandine Garnet Rockhounding in Oxford County, Maine

Updated June 2026

Bumpus Quarry is a mapped rockhounding spot in Oxford County, Maine. Reported finds include albite, almandine garnet, autunite, golden beryl, aquamarine, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Oxford County
State: Maine
Nearest road: Crooked River Causeway
Postcode: 04217
Coordinates: 44.31064, -70.78170

Geology at Bumpus Quarry

This spot sits on tonalite, mapped as tonalite that formed roughly 420 to 360 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: tonalite
Age: 420–360 Ma (Devonian)
Rock types: tonalite
Elevation: 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.

Best time to visit Bumpus Quarry

Best months: April to November. Typical highs run 79°F in midsummer and 28°F in midwinter, with winter lows near 8°F.

Climate normals: NOAA 1991-2020 monthlies, BETHEL 6 SSE station (1 mi away).

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

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

Found at Bumpus Quarry

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 Bumpus Quarry.

Across the state line from Bumpus Quarry

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

Bumpus Quarry FAQ

Where is Bumpus Quarry?+

Bumpus Quarry is in Oxford County, Maine, at 44.31064, -70.78170. Nearest road: Crooked River Causeway.

What rocks and minerals can you find at Bumpus Quarry?+

Bumpus Quarry is reported to produce Albite, Almandine Garnet, Autunite, Golden Beryl, Aquamarine, Mica, Columbite, Fluorapatite, Feldspar, Quartz, Rose Quartz, Smoky Quartz, Schorl, Zircon.

Is collecting allowed at Bumpus Quarry?+

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 Bumpus Quarry?+

A rock hammer, a pry bar, gloves, and safety glasses suit pegmatite ground. Work weathered zones and check dump piles; coarse crystals often sit in decomposed rock.

When is the best time to visit Bumpus Quarry?+

The most comfortable months at Bumpus Quarry are April to November.

How do I get to Bumpus Quarry?+

Open the directions link to navigate to 44.31064, -70.78170 in Google Maps. The nearest road is Crooked River Causeway.

More rockhounding in Maine

See all 31 Maine spots →

Open Bumpus Quarry on the map

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