Princeton: Calcite & Fluorite Rockhounding in Caldwell County, Kentucky

Updated June 2026

Princeton is a mapped rockhounding spot in Caldwell County, Kentucky. Reported finds include calcite, fluorite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Caldwell County
State: Kentucky
Postcode: 42445
Coordinates: 37.09185, -87.84510

Geology at Princeton

This spot sits on Ste. Genevieve Limestone and St. Louis Limestone, Upper Member, mapped as limestone that formed roughly 360 to 325 million years ago. Carbonate rock like this is the classic host for lead, zinc, and fluorite mineralization, which typically follows old cavities and replacement zones.

Mapped unit: Ste. Genevieve Limestone and St. Louis Limestone, Upper Member
Age: 360–325 Ma (Mississippian)
Rock types: limestone
Elevation: 400 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 Princeton

Conditions here are workable year-round, with typical highs from 47°F in winter to 90°F in summer.

Climate normals: NOAA 1991-2020 monthlies, PRINCETON 1 SE station (3 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 Princeton

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 Princeton.

Across the state line from Princeton

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

Princeton FAQ

Where is Princeton?+

Princeton is in Caldwell County, Kentucky, at 37.09185, -87.84510.

What rocks and minerals can you find at Princeton?+

Princeton is reported to produce Calcite, Fluorite.

Is collecting allowed at Princeton?+

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 Princeton?+

A rock hammer, gloves, and safety glasses cover old mining-district ground. Stay out of shafts and adits; the best specimens typically come from dump piles.

When is the best time to visit Princeton?+

Princeton is workable year-round.

How do I get to Princeton?+

Open the directions link to navigate to 37.09185, -87.84510 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Kentucky

See all 37 Kentucky spots →

Open Princeton on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.