National and State Register

Wall Street Assay Office

Boulder County

The circa 1901 building was constructed as part of Charles Caryl’s ambitious development plan for his Gold Extraction Mining and Supply Company, which he founded in 1897.  The primarily stone two-story building is topped with a steeply pitched metal covered hipped roof.

A black and white photo of the brick building with pitched roof and chimney on the right side.

Wall Street Assay Office

The upper portion of the walls and the window trim are of brick.  The structure is one of only a few remaining intact buildings associated with the history of precious metal mining in Boulder County.  Listed under Metal Mining and Tourist Era Resources of Boulder County Multiple Property Submission.