Annicon: Copper Rockhounding in Douglas County, Wisconsin

Quick details

Access

Public area

County

Douglas County

State

Wisconsin

Nearest road

Coolidge Memorial Highway

Coordinates

46.51597, -91.60296

Geology at Annicon

This spot sits on Oronto Group; Freda Sandstone, mapped as arkose and siltstone that formed roughly 1600 to 1000 million years ago. Sedimentary rock like this erodes unevenly, so the most productive collecting is typically along fresh cuts, badland slopes, and active drainages.

Mapped unit

Oronto Group; Freda Sandstone

Age

1600–1000 Ma (Mesoproterozoic)

Rock types

arkose and siltstone

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 Annicon

Best months: April to October. Typical highs run 78°F in midsummer and 20°F in midwinter, with winter lows near 2°F.

Climate normals: NOAA 1991-2020 monthlies, BRULE RS station (2 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 Annicon

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

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