Outgamie County: Ruby & Sapphire Rockhounding in Brown County, Wisconsin

Quick details

Access

Public area

County

Brown County

State

Wisconsin

Nearest road

Eiler Road

Postcode

54115

Coordinates

44.37109, -88.09201

Geology at Outgamie County

This spot sits on ground mapped as Galena Formation that formed roughly 470 to 445 million years ago. Hard resistant minerals typically weather out of the bedrock and concentrate in nearby soils and creek gravels.

Mapped unit

Galena Formation

Age

470–445 Ma (Middle Ordovician to Late Ordovician)

Elevation

610 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 Outgamie County

Best months: April to October. Typical highs run 81°F in midsummer and 25°F in midwinter, with winter lows near 10°F.

Climate normals: NOAA 1991-2020 monthlies, GREEN BAY WFO station (9 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 Outgamie County

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

• RubyEncyclopedia →
• SapphireEncyclopedia →