National Register of Historic Places in San Juan County
The Tobasco Mine and Mill are associated with the metal mining history of Hinsdale and San Juan counties. The complex possesses the distinctive characteristics of a moderate size 1900s gold mine and mill operation in which the organization pattern is clearly evident. Its historical archaeological deposits have the potential to yield important information, specifically addressing the relationship between milling and mining, understanding the early use of the cyanide process, and for information on the health, dietary preferences, and economic status of the inhabitants of the workers at the Tobasco Mine and Mill.
Quoted from the History Colorado website.