Hannibal: Marcasite & Pyrite Rockhounding in Ralls County, Missouri

Updated June 2026

Hannibal is a mapped rockhounding spot in Ralls County, Missouri. Reported finds include marcasite, pyrite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Ralls County
State: Missouri
Nearest road: Revere Trail
Coordinates: 39.66832, -91.33527

Geology at Hannibal

This spot sits on ground 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.

Age: 360–325 Ma (Mississippian)
Rock types: limestone
Elevation: 780 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 Hannibal

Best months: March to November. Typical highs run 85°F in midsummer and 34°F in midwinter, with winter lows near 18°F.

Climate normals: NOAA 1991-2020 monthlies, HANNIBAL WTR WKS station (4 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 Hannibal

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 Hannibal.

Across the state line from Hannibal

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

Hannibal FAQ

Where is Hannibal?+

Hannibal is in Ralls County, Missouri, at 39.66832, -91.33527. Nearest road: Revere Trail.

What rocks and minerals can you find at Hannibal?+

Hannibal is reported to produce Marcasite, Pyrite.

Is collecting allowed at Hannibal?+

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 Hannibal?+

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 Hannibal?+

The most comfortable months at Hannibal are March to November.

How do I get to Hannibal?+

Open the directions link to navigate to 39.66832, -91.33527 in Google Maps. The nearest road is Revere Trail.

More rockhounding in Missouri

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Open Hannibal on the map

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