Muskellunge Lake: Fluorite Rockhounding in Jefferson County, New York

Quick details

Access

Public area

County

Jefferson County

State

New York

Nearest road

New Connecticut Road

Postcode

13691

Coordinates

44.30545, -75.67549

Geology at Muskellunge Lake

This spot sits on Calcitic and dolomitic marble, mapped as marble that formed roughly 1600 to 1000 million years ago. Metamorphic terrain like this commonly hosts vein and replacement mineralization, and old workings typically mark the productive zones.

Mapped unit

Calcitic and dolomitic marble

Age

1600–1000 Ma (Mesoproterozoic)

Rock types

marble

Elevation

370 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 Muskellunge Lake

Best months: April to November. Typical highs run 79°F in midsummer and 27°F in midwinter, with winter lows near 5°F.

Climate normals: NOAA 1991-2020 monthlies, GOUVERNEUR 3 NW station (9 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.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Muskellunge Lake

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

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