Rockhounding Map & Sites in New York: 258 Locations for Crystal Hunting, Gem Mining & More
New York Locations
258 locations found in New York
New York has 258 documented rockhounding and rock hunting sites, including locations for Fossil, Fluorite, and Pyrite. Whether you're crystal hunting, gem mining, or mineral collecting, most sites are on public land and free to access. Use the interactive map above to filter by mineral type, location type, and find GPS coordinates for each site.
Last updated: — 258 verified locations
Recommended Gear for New York
Estwing E3-22P Rock Pick
The industry-standard 22oz geological hammer. One-piece forged steel with shock-reduction grip.
Clear Anti-Fog Safety Glasses (4 Pack)
Adjustable, anti-fog lenses for clear vision in any conditions. About $5 per pair.
Watertight Medical Kit
Compact, waterproof first aid kit with bandages, moleskin, and field essentials.
Rockhounding New York: A Guide To The State's Best Rockhounding Sites
With this informative guide, you can explore the mineral-rich state of New York, from the beaches to the mountains. It d...
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The Best Rockhounding Sites in New York
The most visited pay-to-dig mineral site in America. The fee mines along Route 28 near Middleville open the Little Falls dolostone — the rock whose vugs hold Herkimer diamonds, quartz crystals so clear and sharply doubly-terminated they pass for cut stones. Crack rock all day; keep everything you find.
The quieter Herkimer dig, documented for Herkimer diamond quartz crystals along St. Johnsville’s Lasselsville Ridge. Same dolostone, smaller crowds, and a campground on site — the family-pace alternative to the Route 28 operations. Sledge-and-chisel work on the ledge pays best.
A Little Falls fee dig documented for quartz, fluorite, calcite, and galena — Herkimer-style crystal hunting with a mineral suite the other diamond mines don’t offer. The fluorite and galena ride in the same dolostone pockets as the quartz, so every vug is a surprise.
The garnet mountain. Gore’s ore body produced the largest garnet crystals ever found — almandine the size of basketballs — and made garnet New York’s state gemstone. The area is documented for almandine garnet; the historic Barton workings on the mountain run summer collecting tours over the famous ore.
Orange County’s classic corundum locality, documented for blue and white corundum with fluorite in the Precambrian marbles. Amity specimens sit in museum drawers worldwide — the white marble sheds crystals into the fields and road exposures. An easy reach from the New York metro, and permission-first collecting.
The Balmat–Edwards zinc district, documented for sphalerite, galena, fluorite, barite, and gypsum. One of the great zinc camps of the East — its dumps and exposures still produce honey-colored sphalerite and purple fluorite. The surrounding St. Lawrence County belt adds talc and tremolite at Balmat and geodes at Fowler.
The old Adirondack iron camp with the longest mineral list in northern New York: magnetite, epidote, stilbite, molybdenite, aegirine, wernerite, and more documented on the mine dumps. High, cold, and rich — the micromounter’s mountain, best hunted when the snow is off.
Rockhounding Regions of New York
| Region | Top sites | What you'll find |
|---|---|---|
| Herkimer diamond country (Mohawk Valley) | Herkimer County, Middleville, the St. Johnsville fee digs | Herkimer diamonds — doubly terminated quartz crystals of glassy clarity — weathering out of the Little Falls dolostone |
| Adirondack garnet country | Gore Mountain, North Creek | Almandine garnet — the state gemstone — from the ore that produced the largest garnet crystals in the world |
| St. Lawrence County mineral belt | Balmat, Edwards, DeKalb, Fowler | Sphalerite, galena, fluorite, barite, talc, tremolite, and geodes across the old zinc and talc districts |
| Hudson Valley and Orange County | Amity, the Ancram area lead mines | Blue and white corundum with fluorite at Amity; galena and sphalerite in the old Columbia County lead workings |
| Northeastern Adirondacks | Lyon Mountain | Magnetite with epidote, stilbite, molybdenite, and a long list of accessory minerals on the old iron-mine dumps |
| Lake Erie shore | Eighteenmile Creek | Pyrite nodules and Devonian fossils in the lakeshore shale cliffs |
What Minerals & Gems Can You Find in New York?
New York has 88 documented specimen types across 258 sites. Here are the most commonly reported:
Click on any specimen above to see all locations where it can be found in New York.
Best Time for Crystal Hunting in New York
The Herkimer fee digs run spring through fall — most open around April and close by November, with summer the busy family season. Crystal hunting is rock work, not weather work, so the shoulder months are ideal: cool days, thin crowds, and the same diamonds. After winter frost, freshly opened ledge rock pays best.
The Adirondack sites are summer ground. Lyon Mountain and the Gore Mountain country hold snow late and green up slowly — July through September is the window, and the Barton-area garnet tours run on a summer schedule. Black flies own June in the North Country; bring a head net or wait them out.
St. Lawrence County’s dumps and the Hudson Valley sites stretch the season: leaf-off months make Amity’s field exposures and the Edwards-area workings easiest to read, and a mild winter day is fair digging there. Eighteenmile Creek is best after storms and in low-water months, when fresh shale falls expose new pyrite and fossils.
Check current weather and road conditions before heading out, especially for remote BLM and Forest Service roads.
Where to Find Herkimer Diamonds in New York
Herkimer diamonds are doubly-terminated quartz crystals found in the Cambrian-age Little Falls Dolomite of Herkimer County and surrounding areas. They are not diamonds — they are exceptionally clear, naturally faceted quartz crystals with 18 faces (6 faces on each of two pyramidal terminations plus 6 prism faces). The clarity and natural "diamond" shape make them famous worldwide.
Top sites:
- Herkimer Diamond Mines, Middleville — Fee dig site. Crack open dolomite rock to find crystal-lined pockets. Tools available for rent. Excellent for families and beginners. Sedan access.
- Ace of Diamonds Mine, Middleville — Fee dig site. Similar dolomite collecting. Less crowded than the Herkimer Diamond Mines.
Herkimer diamonds form in vugs (cavities) within the dolomite. The rock is hard — a 3 lb crack hammer and cold chisels are standard. Split the dolomite along bedding planes to expose vugs lined with crystals. Most crystals are small (under 1/2 inch) but gem-clarity. Larger crystals (1+ inch) are less common. Some contain black hydrocarbon inclusions or water-filled enhydro inclusions — these are sought-after collector specimens.
Where to Find Garnet in New York
New York's Adirondack Mountains produce almandine garnets from the Gore Mountain area in Warren County. The garnets here are exceptionally large — crystals up to 6 inches in diameter occur in the garnet amphibolite. Gore Mountain is the type locality for a specific metamorphic reaction that produced these oversized garnets approximately 1 billion years ago.
Top sites:
- Barton Mines, Gore Mountain, North Creek — The world's largest garnet mine (industrial garnet for abrasives). Open for rockhounding (fee). Collect garnets from the mine dumps. Crystals range from thumbnail to fist-sized. Sedan access.
- Ruby Mountain, Warren County — Garnets in metamorphic rock on private land. Limited access.
Gore Mountain garnets are dark red-brown almandine, dodecahedral (12-sided), and heavily fractured internally. Gem-quality specimens are rare — most are opaque. They make excellent display specimens due to their size and crystal form. Bring a bucket — the mine dumps are productive and you can fill it quickly. Look for the dark red dodecahedra embedded in pale amphibolite matrix.
Where to Find Fossils in New York
New York's Devonian-age sedimentary rocks are rich in marine fossils. The Hamilton Group (shale and limestone) across central New York preserves trilobites, brachiopods, crinoids, corals, and bryozoans from approximately 380 million years ago. Penn Dixie Fossil Park near Buffalo is one of the best public fossil collecting sites in the country.
Top sites:
- Penn Dixie Fossil Park & Nature Reserve, Hamburg — Devonian marine fossils in shale. Trilobites (Phacops, Greenops), brachiopods, crinoids, and corals. Small fee. Tools and guidance provided. Open year-round.
- Utica area road cuts, Oneida County — Ordovician shale with graptolites and brachiopods. Surface collecting along road cuts.
Penn Dixie trilobites are the prize find. They are dark brown to black in gray shale, enrolled (curled up) or prone (flattened). Split the shale along bedding planes with a flat-head screwdriver — trilobites are preserved between layers. Work carefully: the cephalon (head) and pygidium (tail) often separate during splitting. Complete specimens are the goal.
New York Rockhounding Laws & Public Land Rules
BLM Land
New York has no BLM land.
National Forests
New York has no National Forest land. The Adirondack Park is a mix of state (Forest Preserve) and private land.
State Parks
Collecting is generally prohibited in New York state parks. The Adirondack Forest Preserve (state-owned land within the Adirondack Park) prohibits mineral collecting without a DEC permit.
Collection Limits
No state-wide collecting regulations for private land.
What's Protected
The New York State Constitution (Article XIV, Section 1) declares Adirondack and Catskill Forest Preserve land "forever wild" — no mineral removal without constitutional amendment or DEC authorization. Vertebrate fossils on state land require authorization.
The Herkimer diamond mines are the most visited collecting sites in New York. The Adirondacks have world-class minerals but access is highly restricted by the "forever wild" constitutional protection. Private land and fee dig sites are the primary collecting options. Penn Dixie is an excellent public fossil park near Buffalo.
Official State Rocks, Minerals & Gems of New York
State Mineral
Herkimer Diamond
State Gem
Garnet
State Fossil
Eurypterus sea scorpion
Herkimer Diamond Mines = most visited mineral pay-to-dig site in the US.
Gear Checklist for Rock Hunting & Gem Mining in New York
What you need depends on the terrain and what you are collecting. Here is a general checklist for New York:
- Rock hammer (3 lb crack hammer for hard rock, geologist's pick for softer material)
- Safety glasses — required any time you swing a hammer
- Chisels — cold chisels for splitting seams and extracting crystals
- Bucket and bags — 5-gallon bucket, zip-lock bags for specimens
- GPS device or phone app — cell service is unreliable at most sites
- 1 gallon of water per person — minimum, more in summer
- Sturdy boots — ankle support for loose talus and mine tailings
- Field guide — a regional mineral identification guide for New York
Always respect private property, follow Leave No Trace principles, and check current regulations before collecting. On BLM land, the general rule is 25 lbs per day plus one specimen for personal, non-commercial use.
New York Locations (258)
- 18 mile creekOther
- 18 Mile CreekPublic Access
- 18 Mile CreekOther
- 3123B, Leptaena-Megakozlowskiella community, Onondaga Limestone, NYOther
- 3124B, Leptaena-Megakozlowskiella community, Onondaga Limestone, NYOther
- 3135, Atrypa-Coelospira-Nucleospira community, Onondaga Limestone, NYOther
- 3137, Atrypa-Coelospira-Nucleospira community, Onondaga Limestone, NYOther
- 3138A, Atrypa-Coelospira-Nucleospira community, Onondaga Limestone, NYOther
- 3144A, Atrypa-Coelospira-Nucleospira community, Onondaga Limestone, NYOther
- 43a. Limestone 1 mile east-northeast of Salem, Cambridge quadrangleOther
Best Rockhounding Sites in New York
The standout collecting sites in New York, each with a full field guide — what you'll find, how to get there, and the rules on the ground.
- Ancram area lead mines
The Ancram lead mines are a cluster of small 18th- and 19th-century lead workings near Boston Corners, in Ancram Township, Columbia County, New York. Mining here predates 1740; the Livingston family held the lease from 1827 to 1837, and others worked the ground intermittently until around 1866 [1].
- Lake Harris
Lake Harris — properly Harris Lake, a 275-acre lake in Newcomb, Essex County, in the Adirondacks — is home to a New York State DEC campground open seasonally from mid-May through early September. S.
- Lyon Mountain
Lyon Mountain, in the Adirondacks' Clinton County, was once one of the deepest iron mines in the United States — the Chateaugay Ore & Iron Company worked it from 1871 to 1967, producing roughly 5 million tons of magnetite ore, some of which reportedly went into the Brooklyn Bridge. That mining history left behind a long list of associated pegmatite and skarn minerals that collectors have documented here for decades, from magnetite itself to more exotic finds like stilbite and molybdenite.
- Tilly Foster Iron Mine
The Tilly Foster Mine, near Brewster in Putnam County, was once one of the world's most productive iron operations — 300 workers pulling 7,000 tons of ore a month by the 1870s, and by the late 1880s it had converted to what was then the largest open-pit mine in the world. That history ended in tragedy: a catastrophic collapse in 1895 killed 13 miners, and the pit subsequently flooded from a nearby reservoir.
- 18 Mile Creek
Eighteenmile Creek — also written 18 Mile Creek or Eighteen Mile Creek — flows into Lake Erie in the Town of Hamburg, Erie County, about 15 miles southwest of Buffalo. It's one of western New York's best-known Devonian fossil and mineral localities, exposing roughly 385-million-year-old Wanakah Shale along its banks and the lake bluffs.
- Ace of Diamonds & Herkimer Diamonds Mine
[^3] Note the site is a distinct business from the larger "Herkimer Diamond Mines" attraction near the village of Herkimer — the database name combines both, but the coordinates given match Ace of Diamonds in Middleville specifically, so that's what this dossier covers. Check current status directly before planning any trip.
- Arnold Hill Mine
5 miles northwest of Clintonville in Clinton County, New York — squarely in the Adirondack iron belt that supplied the region's historic ironworks industry. , Witherbee and Sherman, leased eventually to Republic Steel), and by 1952 had produced roughly 600,000 tons of high-grade ore (about 62% iron) from three parallel veins nicknamed the Blue, Gray, and Black.
- Cornwall (Hudson River)
98826) point to Cornwall, Orange County, New York — but Cornwall sits on the Hudson River, not the Wallkill River, which runs through a different part of Orange County well to the west and doesn't reach Cornwall at all. We've corrected the name to reflect the Hudson River, which is what area sources actually describe as the source of the jasper and bloodstone.
- Fowler
Fowler is a small town in St. Lawrence County, New York, sitting in the heart of one of the Northeast's most significant mining regions — the metamorphosed marble belt that also produced the Balmat-Edwards zinc district and the historic Rossie lead veins nearby.
- Keeseville
Keeseville sits in the Adirondacks, on the edge of one of the largest anorthosite bodies in the world — a roughly 2,500-square-mile igneous mass made almost entirely of plagioclase feldspar, in this case labradorite. Road cuts along I-87, the Adirondack Northway, between Exit 29 (North Hudson) and Exit 34 (Keeseville) pass directly through this anorthosite, and some exposures show strong blue-green labradorescence on fresh or weathered cleavage surfaces — quality comparable to material from Labrador, Canada, or Madagascar, according to Adirondack geology sources.
What You Can Find in New York
Dedicated maps for every mineral with 3+ documented sites in New York:
Rockhounding clubs in New York
Connect with a local gem and mineral society — meetings, field trips, lapidary workshops, and annual shows.
Browse New York clubs →Explore Nearby States
Frequently Asked Questions
Where can you dig for Herkimer diamonds?
The fee mines of the Mohawk Valley — Herkimer Diamond Mines near Middleville, Crystal Grove at St. Johnsville, and Treasure Mountain at Little Falls — all open the Little Falls dolostone whose pockets hold the doubly terminated crystals. Everything you crack out is yours to keep. The map above also shows documented general-area Herkimer ground across Herkimer County for those working beyond the fee digs.
Is there a New York rockhounding map?
Yes — the interactive map above shows 258 documented New York locations, filterable by mineral. It doubles as a state mineral map: Herkimer diamonds in the Mohawk Valley, garnet in the Adirondacks, the zinc-talc belt across St. Lawrence County, corundum at Amity — plus 182 documented fossil localities, the deepest fossil coverage of any state on the map.
Can you find geodes in New York?
Mostly no — New York is not geode country — with one documented exception: Fowler, in St. Lawrence County, carries geodes along with hematite and barite. The state’s real pocket-crystal prize is the Herkimer diamond, which forms in dolostone vugs — cavities that work like geodes lined with water-clear quartz. If it’s hollow-rock treasure you want, the Herkimer fee digs are the reliable answer.
Where can you go rockhounding near New York City?
Orange County is the metro’s collecting ground: Amity is documented for blue and white corundum with fluorite in the marble belt, and the map above shows more documented workings across the county. North up the Hudson, the Ancram area lead mines in Columbia County carry galena and sphalerite. All of it is private-land country — ask permission — and all of it is a day trip from the city.
What gems, minerals, and crystals can I find in New York?
New York has 88 documented specimen types, including Fossil, Fluorite, Pyrite, Quartz, Herkimer Diamond. Use the interactive map above to filter by specimen and see exactly which minerals are reported at each location.
How many rockhounding sites are mapped in New York?
We have 258 rockhounding sites mapped in New York with GPS coordinates, access info, and community-reported finds. New locations are added regularly through community submissions.
When is the best time to go crystal hunting in New York?
Spring through fall are good for rockhounding in New York. Winter conditions may limit access to some locations. Always check current weather and road conditions before heading out, especially for remote collecting sites.
Where can I go gem mining in New York?
New York has 258 mapped locations for gem mining, rock hunting, and mineral collecting. Use the interactive map above to filter by specimen type or location type. Paid dig sites offer a guided experience with tools provided, while public access sites on BLM and Forest Service land are free.
Is rock hunting legal on public land in New York?
Casual rock hunting and mineral collecting is generally allowed on BLM and National Forest land in New York for personal, non-commercial use. The standard BLM limit is 25 lbs per day plus one specimen, not to exceed 250 lbs per year. Always verify regulations for specific sites — national parks, monuments, and some state parks prohibit collecting. See the laws section above for New York-specific rules.
What tools do I need for rockhounding in New York?
Essential rockhounding tools include a rock hammer, safety glasses, chisels, a 5-gallon bucket, zip-lock bags for specimens, a GPS device or phone app, sturdy boots, and a field guide. For New York specifically, check the gear checklist section above for terrain-specific recommendations.
⚠️ Always verify current regulations, weather conditions, and access requirements before visiting any location. Information provided is based on community submissions and may not be current or accurate.
More New York outdoors
From our outdoor network — more ways to explore the state.