Silica Sand Mine
From Underfoot
Q49448404
mine in Pennington County, South Dakota, United States of America
| Type | Subtype | Date | Description | Notes | Source |
|---|---|---|---|---|---|
| site | cave | Jewel Cave | National Park Service, show cave | Wikidata | |
| site | tunnel | Hood Tunnel | road tunnel | Wikidata | |
| site | tunnel | Unknown | road tunnel | Wikidata | |


