English: The Holden Mining and Smelting Company in Aspen, Colorado. The smelter used a process called lixiviation to extract silver from ores taken from area mines. The property, now a museum, is listed on the National Register of Historic Places.
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{{Information |Description ={{en|1=The Holden Mining and Smelting Company in Aspen, Colorado. The smelter used a process called lixiviation to extract silver from ores taken from area mines. The property, now a museum, is listed on the National Registe
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