Caldwell Quarry: Fluorite Rockhounding in Boyle County, Kentucky

Quick details

Access

Public area

County

Boyle County

State

Kentucky

Nearest road

Stanford Road

Postcode

40422

Coordinates

37.62620, -84.74644

Geology at Caldwell Quarry

This spot sits on Clays Ferry Formation, mapped as shale | limestone | siltstone that formed roughly 460 to 445 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

Clays Ferry Formation

Age

460–445 Ma (Late Ordovician)

Rock types

shale | limestone | siltstone

Elevation

850 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 Caldwell Quarry

Best months: February to December. Typical highs run 87°F in midsummer and 43°F in midwinter, with winter lows near 24°F.

Climate normals: NOAA 1991-2020 monthlies, DANVILLE station (2 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 Caldwell Quarry

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

• FluoriteEncyclopedia →