Monroe: Galena Rockhounding in Green County, Wisconsin

Quick details

Access

Public area

County

Green County

State

Wisconsin

Nearest road

11th Street

Postcode

53566

Coordinates

42.60007, -89.65171

Geology at Monroe

This spot sits on Sinnipee Group, mapped as dolostone that formed roughly 485 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

Sinnipee Group

Age

485–445 Ma (Ordovician)

Rock types

dolostone

Elevation

1,020 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 Monroe

Best months: April to November. Typical highs run 82°F in midsummer and 27°F in midwinter, with winter lows near 11°F.

Climate normals: NOAA 1991-2020 monthlies, MONROE WWTP station (1 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 Monroe

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

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