New London: Agate & Jasper Rockhounding in Henry County, Iowa

Updated June 2026

New London is a mapped rockhounding spot in Henry County, Iowa. Reported finds include agate, jasper. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Henry County
State: Iowa
Nearest road: Joyce & Ted's Place
Postcode: 52645
Coordinates: 40.87988, -91.39064

Geology at New London

This spot sits on ground mapped as Augusta Group that formed roughly 355 to 330 million years ago. Tough silica like agate and jasper typically survives weathering and collects as float in drainages and gravel.

Mapped unit: Augusta Group
Age: 355–330 Ma (Mississippian)
Elevation: 640 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 New London

Best months: March to November. Typical highs run 85°F in midsummer and 32°F in midwinter, with winter lows near 13°F.

Climate normals: NOAA 1991-2020 monthlies, MT PLEASANT 1 SW station (12 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 New London

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 New London.

Across the state line from New London

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

New London FAQ

Where is New London?+

New London is in Henry County, Iowa, at 40.87988, -91.39064. Nearest road: Joyce & Ted's Place.

What rocks and minerals can you find at New London?+

New London is reported to produce Agate, Jasper.

Is collecting allowed at New London?+

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 New London?+

Most agate and jasper is surface float: bring a spray bottle, a pick or small shovel, and a sturdy bag. Wet stones show their banding and translucence.

When is the best time to visit New London?+

The most comfortable months at New London are March to November.

How do I get to New London?+

Open the directions link to navigate to 40.87988, -91.39064 in Google Maps. The nearest road is Joyce & Ted's Place.

More rockhounding in Iowa

See all 49 Iowa spots →

Open New London on the map

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