From the record
“The Silver City Historic District is a historically significant mining area in northwestern Owyhee County, Idaho, United States. It includes the abandoned town of Silver City and numerous nearby towns, mines, and mining remains, covering approximately 37 square feet.”
Wikipedia article Silver City Historic District (Idaho), CC BY-SA 4.0.
One of 11 National Register listings published here for Owyhee County · listed in 1972 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service