RockWoofFound alongside
Garnet
Mohs 6.5–7.5. Usually deep red, round many-faced crystals. Mindat
24 sites
Mica
Mohs 2–3. Peels into thin, flexible, shiny sheets. Mindat
23 sites
Quartz
Mohs 7. Six-sided points; smoky quartz is NH’s state gem. Mindat
21 sites
Feldspar
Mohs 6–6.5. Blocky crystals with flat cleavage faces. Mindat
20 sites
Tourmaline
Mohs 7–7.5. Long striated crystals, often black (schorl) or green and pink (elbaite). Mindat
17 sites
Beryl
Mohs 7.5–8. Six-sided crystals; aquamarine and emerald are beryl. Mindat
12 sites
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
By county
Custer County (17) · Pennington County (7)
Sites
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Highland Mine | Beryllium, Mica, Feldspar | Albite, Beryl, Lithiophilite, Microcline, Muscovite | Past Producer | 43.766, -103.679 |
| Pine Top Lode | Mica, Feldspar | Albite, Muscovite | Past Producer | 43.727, -103.615 |
| Southern Black Hills Kyn Mine | Kyanite | Andalusite, Garnet, Sillimanite | Past Producer | 43.750, -103.501 |
| Put Lode | Beryllium | Beryl | Past Producer | 43.854, -103.373 |
| Lookout No. 5 Lode | Beryllium, Feldspar | Beryl, Feldspar | Past Producer | 43.679, -103.634 |
| Mcarthur Mine | Mica | Beryl, Feldspar, Mica | Past Producer | 43.703, -103.627 |
| Rainbow No. 4 Claim | Mica, Feldspar, Beryllium | Beryl, Feldspar, Mica | Past Producer | 43.730, -103.696 |
| Big Chief Mine | Feldspar, Mica | Beryl, Feldspar, Mica | Past Producer | 43.865, -103.382 |
| Blue Bonnet Claim | Mica | Beryl, Muscovite | Past Producer | 43.747, -103.528 |
| Big Spar No. 1 Mine | Feldspar, Mica, Beryllium | Beryl, Muscovite | Past Producer | 43.754, -103.653 |
| Knowles Lode Claim | Quartz, Mica, Beryllium | Beryl, Muscovite, Quartz | Occurrence | 43.785, -103.594 |
| Surprise Mica Mine | Mica | Biotite, Muscovite | Past Producer | 43.781, -103.597 |
| Bullion Mine Pennington County | Gold, Silver | Chalcopyrite, Gold, Pyrrhotite | Past Producer | 43.898, -103.419 |
| Red Bird Lode | Mica, Feldspar | Feldspar | Occurrence | 43.696, -103.638 |
| Ixl Lode No. 4 Prospect | Feldspar, Mica | Feldspar, Mica | Occurrence | 43.777, -103.529 |
| McKinnon and Miller's Claim | Mica, Feldspar, Tungsten | Feldspar, Muscovite, Wolframite | Occurrence | 43.888, -103.542 |
| Michigan Placer Ground | Mica, Feldspar, Tungsten | Feldspar, Muscovite, Wolframite | Occurrence | 43.888, -103.552 |
| Josie Lode Mine | Mica | Muscovite | Past Producer | 43.836, -103.386 |
| Ray Prospect | Mica | Muscovite | Past Producer | 43.699, -103.634 |
| Red Deer Mine | Mica | Muscovite | Past Producer | 43.695, -103.502 |
| Hofert Arcade | Mica | Muscovite | Past Producer | 43.794, -103.533 |
| Mary Belle Mine | Gold, Silver | Silver | Past Producer | 44.122, -103.732 |
| Tungsten Lode | Tungsten | Wolframite | Past Producer | 43.871, -103.561 |
| Ingersoll Mine | Tin, Tantalum, Niobium (Columbium) | — | Past Producer | 43.911, -103.452 |
Back to Rockhounding in South Dakota.
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