Diamond Acres Mine: Herkimer Diamond & Quartz Rockhounding in Montgomery County, New York

Updated June 2026

Diamond Acres Mine is a mapped rockhounding spot in Montgomery County, New York. Reported finds include herkimer diamond, quartz. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Paid / fee dig
County: Montgomery County
State: New York
Nearest road: Stone Arabia Road
Postcode: 12068
Coordinates: 42.96211, -74.47517

Geology at Diamond Acres Mine

This spot sits on Theresa (Galway) Formation, mapped as dolostone that formed roughly 540 to 485 million years ago. Carbonate rock like this dissolves and weathers readily, so fresh road cuts, quarries, and creek exposures are typically the most productive ground.

Mapped unit: Theresa (Galway) Formation
Age: 540–485 Ma (Cambrian)
Rock types: dolostone
Elevation: 990 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 Diamond Acres Mine

Best months: April to October. Typical highs run 78°F in midsummer and 26°F in midwinter, with winter lows near 9°F.

Climate normals: NOAA 1991-2020 monthlies, GLOVERSVILLE 7NW (PECK LAKE) station (11 mi away), adjusted for elevation.

Land & collecting status

Pay-to-dig site

This is a fee-dig location. Hours, prices, and what you can keep vary by operator. Call ahead before driving out.

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 Diamond Acres 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 Diamond Acres Mine.

Across the state line from Diamond Acres Mine

Diamond Acres 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.

Diamond Acres Mine FAQ

Where is Diamond Acres Mine?+

Diamond Acres Mine is in Montgomery County, New York, at 42.96211, -74.47517. Nearest road: Stone Arabia Road.

What rocks and minerals can you find at Diamond Acres Mine?+

Diamond Acres Mine is reported to produce Herkimer Diamond, Quartz.

Is collecting allowed at Diamond Acres Mine?+

Pay-to-dig site. This is a fee-dig location. Hours, prices, and what you can keep vary by operator. Call ahead before driving out. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Diamond Acres Mine?+

A rock hammer, a small pry bar, gloves, and safety glasses cover most crystal ground. A screen helps in loose pocket soil, and newspaper protects points on the way out.

When is the best time to visit Diamond Acres Mine?+

The most comfortable months at Diamond Acres Mine are April to October.

How do I get to Diamond Acres Mine?+

Open the directions link to navigate to 42.96211, -74.47517 in Google Maps. The nearest road is Stone Arabia Road.

More rockhounding in New York

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Open Diamond Acres Mine on the map

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