Sulphur Hill Mine: Willemite Rockhounding in Sussex County, New Jersey

Updated June 2026

Sulphur Hill Mine is a mapped rockhounding spot in Sussex County, New Jersey. Reported finds include willemite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Sussex County
State: New Jersey
Nearest road: Limecrest Road
Coordinates: 41.00716, -74.73336

Geology at Sulphur Hill Mine

This spot sits on Amphibolite, mapped as amphibolite that formed roughly 1600 to 1000 million years ago. Metamorphic rock like this weathers into resistant float, and minerals that survive transport typically concentrate in nearby drainages.

Mapped unit: Amphibolite
Age: 1600–1000 Ma (Mesoproterozoic)
Rock types: amphibolite
Elevation: 700 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 Sulphur Hill Mine

Best months: March to November. Typical highs run 83°F in midsummer and 35°F in midwinter, with winter lows near 18°F.

Climate normals: NOAA 1991-2020 monthlies, AEROFLEX-ANDOVER AP station (0 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 Sulphur Hill Mine

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

Willemite

Nearby rockhounding spots

Other rockhounding spots within driving distance of Sulphur Hill Mine.

Across the state line from Sulphur Hill Mine

Sulphur Hill Mine is close enough to the New Jersey border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Sulphur Hill Mine FAQ

Where is Sulphur Hill Mine?+

Sulphur Hill Mine is in Sussex County, New Jersey, at 41.00716, -74.73336. Nearest road: Limecrest Road.

What rocks and minerals can you find at Sulphur Hill Mine?+

Sulphur Hill Mine is reported to produce Willemite.

Is collecting allowed at Sulphur Hill Mine?+

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 Sulphur Hill Mine?+

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 Sulphur Hill Mine?+

The most comfortable months at Sulphur Hill Mine are March to November.

How do I get to Sulphur Hill Mine?+

Open the directions link to navigate to 41.00716, -74.73336 in Google Maps. The nearest road is Limecrest Road.

More rockhounding in New Jersey

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Open Sulphur Hill Mine on the map

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