Rockhounding in New York
The federal mineral record holds 3,179 entries for New York — 2,709 mines that shipped ore, 153 prospects that never became mines, 261 recorded occurrences. Below it: 6 places where you can legally collect.
What's in the ground
Mineral history, not an invitation. This mineral history comes from a federal record of historic mines, prospects, and occurrences. It is not a list of places to collect. Historic mine sites are usually on private land, under active mining claims, or unsafe to enter — and often all three. The places you can actually collect are in the legal-access directory below.
The commodities that drew miners and prospectors to New York, by number of historic records:
Iron · 630Salt · 165Limestone · 142Clay · 115Graphite · 91Titanium · 83Lead · 75Gypsum-Anhydrite · 61
For collectors, the record says:
- Garnets — 42 records, clustered in Warren, Hamilton, Essex counties
- Quartz Crystals — 35 records, clustered in Washington, Warren, Saratoga counties
- Copper — 24 records, clustered in Putnam, Dutchess, St. Lawrence counties
- Silver — 19 records, clustered in Columbia, Putnam, Dutchess counties
- Gemstones — 9 records, clustered in Orange, New York, St. Lawrence counties
Records from the USGS Mineral Resources Data System, a legacy federal database last revised August 2022 and no longer updated.
Where you can actually collect
Hours, fees, and access rules change. Verify with the operator or land agency before you go.
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Crystal Grove Diamond Mine & Campground
St. Johnsville, NY
herkimer diamondsdoubly terminated quartzcalcite
Fee dig · Fee, seasonal · mid-April through mid-October; daily hours are not posted online, so call ahead at (518) 568-2914 if arriving late in the day
Checked against its source August 16, 2026
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Diamond Mountain Mining, Little Falls
Little Falls, NY
herkimer diamondsscepter quartzskeletal quartz
Fee dig · Fee · reservation-only digs; the on-site Diamond House Crystal Gallery keeps Tuesday 10am-4pm hours and opens by appointment otherwise
Checked against its source August 16, 2026
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Dirty Diamond Diggers, Fort Plain
Fort Plain, NY
herkimer diamondsdoubly terminated quartzcalcite
Fee dig · Fee · Thursday and Friday 7am-2pm, Saturday and Sunday 7am to dark; season dates are not posted
Checked against its source August 16, 2026
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Herkimer Diamond Mines
Middleville, NY
herkimer diamondsdoubly terminated quartzcalcite
Fee dig · Fee, seasonal · April 12 through October 31, 2026; open 9am-5pm seven days a week. No reservation needed
Checked against its source August 16, 2026
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Herkimer Mountain Diamond Mine
NY
herkimer diamondsdoubly terminated quartzsmoky quartz
Fee dig · Fee · 9am to 4pm dig day with 5pm checkout, ending a half hour before dark in the fall season; season dates are not published, so book ahead and confirm
Checked against its source August 16, 2026
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Penn Dixie Fossil Park & Nature Reserve
Blasdell, NY
pyritecalcitemarcasite
Fee dig · Fee, seasonal · June 24 through September 27, 2026; Wednesday-Sunday 9am-4:30pm through Labor Day (September 7), then weekends only. No public entry after 2:45pm and the final tour departs then
Checked against its source August 16, 2026
Questions collectors ask
Is rockhounding legal in New York?
Yes — at places that allow it. This page lists 6 in New York: fee digs, designated collecting areas, and official localities, each checked against its source. Everywhere else, legality depends on who owns the land and what rules apply. Before any trip: check land ownership and current mining claims, get permission, respect closures, and never enter old mine workings.
Can I collect at old mines in New York?
Treat New York's historic mines as history, not destinations. Most sit on private land or active mining claims, and old workings are dangerous even to walk. The mineral record on this page tells you what the ground holds — the directory tells you where you are welcome to look for it.