Arnold Hill Mine: Jasper & Magnetite Rockhounding in Clinton County, New York

Updated June 2026

Arnold Hill Mine is a mapped rockhounding spot in Clinton County, New York. Reported finds include jasper, magnetite, martite, quartz. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Clinton County
State: New York
Postcode: 12924
Coordinates: 44.48936, -73.62719

Geology at Arnold Hill Mine

This spot sits on Pyroxene and/or hornblende granitic gneiss, mapped as gneiss 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: Pyroxene and/or hornblende granitic gneiss
Age: 1600–1000 Ma (Mesoproterozoic)
Rock types: gneiss
Elevation: 1,210 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 Arnold Hill Mine

Best months: April to October. Typical highs run 79°F in midsummer and 26°F in midwinter, with winter lows near 8°F.

Climate normals: NOAA 1991-2020 monthlies, PERU 2 WSW 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.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Arnold Hill Mine

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 Arnold Hill Mine.

Across the state line from Arnold Hill Mine

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

Arnold Hill Mine FAQ

Where is Arnold Hill Mine?+

Arnold Hill Mine is in Clinton County, New York, at 44.48936, -73.62719.

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

Arnold Hill Mine is reported to produce Jasper, Magnetite, Martite, Quartz.

Is collecting allowed at Arnold 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 Arnold Hill Mine?+

Most agate and jasper is surface float: bring a spray bottle, a pick or small shovel, and a sturdy bag. Wet stones show their banding and translucence.

When is the best time to visit Arnold Hill Mine?+

The most comfortable months at Arnold Hill Mine are April to October.

How do I get to Arnold Hill Mine?+

Open the directions link to navigate to 44.48936, -73.62719 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in New York

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Open Arnold Hill Mine on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.