Old Thompson Ranch: Barite & Iron Rockhounding in Johnston County, Oklahoma

Updated June 2026

Old Thompson Ranch is a mapped rockhounding spot in Johnston County, Oklahoma. Reported finds include barite, iron. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Check locally
County: Johnston County
State: Oklahoma
Coordinates: 34.46962, -96.77322

Geology at Old Thompson Ranch

This spot sits on West Spring Creek Formation, mapped as limestone and dolostone that formed roughly 485 to 470 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: West Spring Creek Formation
Age: 485–470 Ma (Early Ordovician)
Rock types: limestone and dolostone
Elevation: 1,110 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 Old Thompson Ranch

Best months: September to June. Typical highs run 92°F in midsummer and 51°F in midwinter, with winter lows near 30°F.

Climate normals: NOAA 1991-2020 monthlies, FITTSTOWN 6SW MESONET station (7 mi away).

Land & collecting status

Confirm rules before collecting

Land status here is not confirmed. Verify with the managing agency before collecting — federal, state, and tribal rules differ.

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 Old Thompson Ranch

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 Old Thompson Ranch.

Old Thompson Ranch FAQ

Where is Old Thompson Ranch?+

Old Thompson Ranch is in Johnston County, Oklahoma, at 34.46962, -96.77322.

What rocks and minerals can you find at Old Thompson Ranch?+

Old Thompson Ranch is reported to produce Barite, Iron.

Is collecting allowed at Old Thompson Ranch?+

Confirm rules before collecting. Land status here is not confirmed. Verify with the managing agency before collecting — federal, state, and tribal rules differ. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Old Thompson Ranch?+

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 Old Thompson Ranch?+

The most comfortable months at Old Thompson Ranch are September to June.

How do I get to Old Thompson Ranch?+

Open the directions link to navigate to 34.46962, -96.77322 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Oklahoma

See all 36 Oklahoma spots →

Open Old Thompson Ranch on the map

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