Btwn Spider Lake & Lost Land Lake: Kyanite Rockhounding in Sawyer County, Wisconsin

Quick details

Access

Public area

County

Sawyer County

State

Wisconsin

Nearest road

Upper A Road

Coordinates

46.10298, -91.17652

Geology at Btwn Spider Lake & Lost Land Lake

This spot sits on Migmatitic gneiss and amphibolite (Late to Early Archean), mapped as gneiss and amphibolite that formed roughly 3600 to 3200 million years ago. Metamorphic rock like this is where garnet, staurolite, and kyanite typically grow as the rock recrystallizes under heat and pressure.

Mapped unit

Migmatitic gneiss and amphibolite (Late to Early Archean)

Age

3600–3200 Ma (Paleoarchean)

Rock types

gneiss and amphibolite

Elevation

1,400 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 Btwn Spider Lake & Lost Land Lake

Best months: April to October. Typical highs run 77°F in midsummer and 20°F in midwinter, with winter lows near 1°F.

Climate normals: NOAA 1991-2020 monthlies, CLAM LAKE 4W station (10 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 Btwn Spider Lake & Lost Land Lake

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

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