Halder: Epidote & Unakite Rockhounding in Marathon County, Wisconsin

Updated June 2026

Halder is a mapped rockhounding spot in Marathon County, Wisconsin. Reported finds include epidote, unakite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Marathon County
State: Wisconsin
Nearest road: Fairview Road
Postcode: 54426
Coordinates: 44.81606, -89.96517

Geology at Halder

This spot sits on ground mapped as Quartz monzonite that formed roughly 2500 to 1600 million years ago. Plutonic rock like this weathers slowly into grus and boulders, and the most productive collecting is typically in weathered zones and drainages.

Mapped unit: Quartz monzonite
Age: 2500–1600 Ma (Paleoproterozoic)
Elevation: 1,190 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 Halder

Best months: April to October. Typical highs run 80°F in midsummer and 23°F in midwinter, with winter lows near 6°F.

Climate normals: NOAA 1991-2020 monthlies, MARSHFIELD EXP FARM station (15 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 Halder

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 Halder.

Halder FAQ

Where is Halder?+

Halder is in Marathon County, Wisconsin, at 44.81606, -89.96517. Nearest road: Fairview Road.

What rocks and minerals can you find at Halder?+

Halder is reported to produce Epidote, Unakite.

Is collecting allowed at Halder?+

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 Halder?+

A rock hammer, sturdy gloves, safety glasses, and a collecting bag cover the basics here. Add a spray bottle: wet rock shows color and pattern that dry rock hides.

When is the best time to visit Halder?+

The most comfortable months at Halder are April to October.

How do I get to Halder?+

Open the directions link to navigate to 44.81606, -89.96517 in Google Maps. The nearest road is Fairview Road.

More rockhounding in Wisconsin

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Open Halder on the map

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