Weber Quarry: Geode Digging in Saint Charles County, Missouri

Updated June 2026

Weber Quarry is a mapped rockhounding spot in Saint Charles County, Missouri. Reported finds include geode, fluorite, millerite, calcite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Saint Charles County
State: Missouri
Nearest road: I 70
Postcode: 63337
Coordinates: 38.80434, -90.74286

Geology at Weber Quarry

This spot sits on ground mapped as limestone that formed roughly 360 to 325 million years ago. Limestone country like this is classic geode ground: cavities in the carbonate rock can line themselves with quartz or calcite crystals.

Age: 360–325 Ma (Mississippian)
Rock types: limestone
Elevation: 530 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 Weber Quarry

Best months: February to November. Typical highs run 88°F in midsummer and 40°F in midwinter, with winter lows near 21°F.

Climate normals: NOAA 1991-2020 monthlies, WELDON SPRING NWS station (8 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 Weber Quarry

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 Weber Quarry.

Across the state line from Weber Quarry

Weber Quarry 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.

Weber Quarry FAQ

Where is Weber Quarry?+

Weber Quarry is in Saint Charles County, Missouri, at 38.80434, -90.74286. Nearest road: I 70.

What rocks and minerals can you find at Weber Quarry?+

Weber Quarry is reported to produce Geode, Fluorite, Millerite, Calcite.

Is collecting allowed at Weber Quarry?+

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 Weber Quarry?+

Bring a crack hammer, a chisel, safety glasses, and a bucket. Candidates are rounder and lighter than solid rock; a soil pipe cutter opens them cleaner than a flat smash.

When is the best time to visit Weber Quarry?+

The most comfortable months at Weber Quarry are February to November.

How do I get to Weber Quarry?+

Open the directions link to navigate to 38.80434, -90.74286 in Google Maps. The nearest road is I 70.

More rockhounding in Missouri

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Open Weber Quarry on the map

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