RockWoofFound alongside
Quartz
Mohs 7. Six-sided points; smoky quartz is NH’s state gem. Mindat
13 sites
Pyrite
Mohs 6–6.5. Brassy “fool’s gold,” often cubic. Mindat
13 sites
Galena
Mohs 2.5–2.75. Heavy, silvery lead ore that breaks into cubes. Mindat
9 sites
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
By county
Dubuque County (11) · Clayton County (2)
Sites
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Holmes Mine | Lead | Galena | Unknown | 42.814, -91.151 |
| Beadle Mine | Lead | Galena | Unknown | 42.469, -90.727 |
| Level Mine | Lead | Galena | Unknown | 42.509, -90.708 |
| Stewarts Cave Mine | Lead | Galena | Unknown | 42.525, -90.703 |
| Levens Mine | Lead | Galena | Unknown | 42.513, -90.717 |
| Kilbourne Mine | Lead | Galena | Unknown | 42.506, -90.696 |
| Kann Mine | Lead | Galena | Unknown | 42.818, -91.166 |
| Brugh and Amsden Mine | Lead | Galena | Unknown | 42.474, -90.727 |
| Stewart and Bartlett Mine | Lead | Galena | Unknown | 42.525, -90.708 |
| Bonson Mine | Zinc | Sphalerite | Unknown | 42.551, -90.771 |
| Fourteenth Street Mine | Zinc | Sphalerite | Unknown | 42.493, -90.686 |
| Fitzpatrick Mine | Zinc | Sphalerite | Unknown | 42.639, -90.929 |
| Durango Drybone Mine | Zinc | Sphalerite | Unknown | 42.555, -90.786 |
Back to Rockhounding in Iowa.
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 USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date.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