Warren Nickel Prospect: Pyrrhotite & Chalcopyrite Rockhounding in Knox County, Maine

Updated June 2026

Warren Nickel Prospect is a mapped rockhounding spot in Knox County, Maine. Reported finds include pyrrhotite, chalcopyrite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Knox County
State: Maine
Nearest road: Eastern Road
Postcode: 04864
Coordinates: 44.17690, -69.25578

Geology at Warren Nickel Prospect

This spot sits on Penobscot Formation, mapped as slate, schist, and quartzite that formed roughly 470 to 445 million years ago. Metamorphic rock like this weathers into resistant float, and minerals that survive transport typically concentrate in nearby drainages.

Mapped unit: Penobscot Formation
Age: 470–445 Ma (Middle Ordovician to Late Ordovician)
Rock types: slate, schist, and quartzite
Elevation: 220 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 Warren Nickel Prospect

Best months: April to November. Typical highs run 77°F in midsummer and 31°F in midwinter, with winter lows near 13°F.

Climate normals: NOAA 1991-2020 monthlies, W ROCKPORT 1 NNW station (6 mi away), adjusted for elevation.

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.

State guidance last verified: April 1, 2026

Maine Geological Survey
Maine Mineral & Gem Museum
Acadia National Park rules
Community submissions reviewed against published agency rules

Found at Warren Nickel Prospect

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 Warren Nickel Prospect.

Warren Nickel Prospect FAQ

Where is Warren Nickel Prospect?+

Warren Nickel Prospect is in Knox County, Maine, at 44.17690, -69.25578. Nearest road: Eastern Road.

What rocks and minerals can you find at Warren Nickel Prospect?+

Warren Nickel Prospect is reported to produce Pyrrhotite, Chalcopyrite.

Is collecting allowed at Warren Nickel Prospect?+

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 Warren Nickel Prospect?+

A rock hammer, gloves, and safety glasses are enough for oxidized copper ground. Look for green and blue staining on weathered rock and in old dump piles.

When is the best time to visit Warren Nickel Prospect?+

The most comfortable months at Warren Nickel Prospect are April to November.

How do I get to Warren Nickel Prospect?+

Open the directions link to navigate to 44.17690, -69.25578 in Google Maps. The nearest road is Eastern Road.

More rockhounding in Maine

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Open Warren Nickel Prospect on the map

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