Rockhounding in Sullivan County, NH: 37 USGS Mineral Sites (2026)

Check access before you go. Most sites listed here are old mines, quarries or prospects, and many are on private land or active mining claims. Get the landowner's permission, check the rules of the agency that manages any public land, and never enter mine workings. Locations are approximate.

Sketch map

Past ProducerProducerProspectOccurrenceStatus unknown

29 paw pins; nearby sites are grouped into one pin. Hover or tap a pin for the site name. 1 site(s) with USGS coordinates outside the outline are not pinned. County outline: US Census Bureau cartographic boundary file (2023). Locations approximate.

Woof’s favorite find

Lamb Mine

We picked it because its USGS record mentions 2 gem or collectible minerals (Gold, Silver) and 3 of our card minerals overall. No other named site here scores as high on both counts. USGS lists it as prospect for Silver, Gold, Mica. Minerals mentioned: Gold, Mica, Silver. Approx. location 43.518, -72.009. USGS record.

Ask first: a USGS record doesn’t mean you can visit. Find out who owns the land and get permission before collecting.

Field cards: what kind of sites?

Prospect

Explored or test-dug, with no recorded production.

Past Producer

Produced ore or material at some point in the past.

Occurrence

The mineral was noted here, without development.

Producer

Was producing when the record was made.

Unknown

Status not recorded.

Status terms come from USGS MRDS records.

Mineral cards

Feldspar
Mohs 6–6.5. Blocky crystals with flat cleavage faces. Mindat
13 sites
Mica
Mohs 2–3. Peels into thin, flexible, shiny sheets. Mindat
11 sites
Copper
Mohs 2.5–3. Native copper is soft and turns green as it weathers. Mindat
6 sites
Pyrite
Mohs 6–6.5. Brassy “fool’s gold,” often cubic. Mindat
2 sites
Silver
Mohs 2.5–3. Native silver tarnishes black. Mindat
2 sites
Gold
Mohs 2.5–3. Soft, heavy and bright yellow; it doesn’t tarnish. Mindat
1 site

Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.

Minerals recorded here

Graphite 1

Commodities

Mica 10Silica 7Copper 6Zinc 5Feldspar 5Lead 3Graphite 3Sulfur-Pyrite 2Beryllium 2Silver 2

Sites

Site	Commodity	Minerals recorded	Status	Approx. location
Franklin Pierce Graphite Mine	Graphite	Graphite	Past Producer	43.279, -72.095
Croydon-Corbin Park	Zinc, Copper, Lead	—	Past Producer	43.432, -72.248
Neal Mine	Copper, Sulfur-Pyrite	—	Producer	43.282, -72.335
N. Wookstock Mine Horner'sS Farm	Lead, Zinc	—	Past Producer	43.992, -71.688
Beryl Mt. Mine	Beryllium	—	Past Producer	43.199, -72.286
Hubbard-Neal Mine	Copper	—	Past Producer	43.306, -72.311
Claremont Zinc Showing	Zinc, Sulfur-Pyrite	—	Occurrence	43.376, -72.338
Croydon Pyrite Mines	Copper, Zinc	—	Past Producer	43.435, -72.247
G.F. Smith & Chandler Mills Mine	Mica	—	Prospect	43.359, -72.252
Aaron Ledge Mica Prospects	Mica	—	Prospect	43.536, -72.019
Lamb Mine	Silver, Gold, Mica	—	Prospect	43.518, -72.009
Columbian Gem Mine	Feldspar	—	Prospect	43.524, -71.978
Goshen Mine	Graphite	—	Past Producer	43.267, -72.083
Beryl Mountain Pegmatites	Feldspar	—	Past Producer	43.181, -72.294
Sargeant Mica Mine	Feldspar	—	Past Producer	43.335, -72.270
Dutchman Pond Diatomite	Diatomite	—	Prospect	43.452, -72.023
Justin Nichols Mica Prospect	Mica	—	Prospect	43.481, -72.057
Lemiere Prospect	Beryllium	—	Prospect	43.307, -72.242
Croydon Mine	Copper, Zinc, Sulfur	—	Unknown	43.421, -72.245
Glidden Hill Quartz	Silica	—	Prospect	43.303, -72.302
Neal Mine	Copper	—	Past Producer	43.296, -72.315
Plainfield Foundry Sand Prospect	Silica	—	Prospect	43.533, -72.358
Croydon Flats Prospect	Lead	—	Occurrence	43.420, -72.207
Colby Mica Mine	Mica	—	Prospect	43.522, -72.011
Sawyer Brook Quartzite	Silica	—	Prospect	43.303, -72.303
President Pierce Mine	Graphite	—	Past Producer	43.276, -72.098
Charlestown Foundry Sand Prospect	Silica	—	Prospect	43.324, -72.391
Yuhas No. 1 Feldspar Mine	Feldspar	—	Past Producer	43.167, -72.325
Paul Mica Prospect	Mica	—	Prospect	43.370, -72.111
Melvin Hill Mica Prospects	Mica	—	Prospect	43.519, -72.023
Yuhas No. 2 Mica Mine	Feldspar	—	Past Producer	43.164, -72.322
Ledge Pond Mica Mine	Mica	—	Prospect	43.425, -72.096
Langdon Quartz	Silica	—	Prospect	43.200, -72.354
Hein Quartz Prospect	Silica	—	Prospect	43.489, -72.153
Kimball Property Quartz Prospect	Silica	—	Prospect	43.499, -72.146
Reynolds Mica Prospect	Mica	—	Prospect	43.526, -71.977
Globe Mica Mine	Mica	—	Past Producer	43.503, -72.008

Nearby counties

Cheshire County · Merrimack County · Grafton County · Hillsborough County · Belknap County

New Hampshire mineral guides

Back to all New Hampshire counties.

How we built this page: we counted named sites in the USGS Mineral Resources Data System (MRDS) for this area, left out sand, gravel, crushed stone, clay pits and unnamed sites, grouped them by Census county, and linked every site to its USGS record. We did not visit these sites, and MRDS does not tell you who owns the land or whether collecting is allowed.

Source: USGS Mineral Resources Data System (MRDS). USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date. Each site links to its USGS record.

Updated October 2026

Rockhounding in Sullivan County, New Hampshire

Sketch map

Lamb Mine

Field cards: what kind of sites?

Mineral cards

Feldspar

Mica

Copper

Pyrite

Silver

Gold