Holden Marolt Mining & Ranching Museum (Aspen, Colorado)

 museum, NRHP - National Register of Historic Places, historic district, historic ruins, mining museum

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Historic former silver ore processing facility (now open as a mining museum) listed on the National Register of Historic Places (NRHP) as a historic district.

- Built: 1891-1893
- Areas of significance: Industry
- Area: 2.5 acres
- Also known as: Holden Mining and Smelting Co. (historic name); Holden Lixiviation Works; Holden-Marolt Complex
- Date added to NRHP: 6/22/1990
- Other designations: U.S. Historic District; part of the "Historic Resources of Aspen" Multiple Property Submission; listed on the Colorado State Register of Historic Properties

The massive original mill building, located at the east end of the property, exists only as foundation ruins today. Only two original buildings remain, the sampling works and the salt shed. The ruins have the potential to yield important research into the mining industry as it existed at the turn of the 20th century.