Kennecott Copper Corporation, Leaching Plant, On Copper River & Northwestern Railroad, Kennicott, Valdez-Cordova Census Area, AK

Significance: The original leaching plant (now the south end of the building) was constructed in 1915 and went into production the next year. The first four leaching tanks could process 300 tons of ore per day. Within a year the number of leaching tanks was doubled with additions to the north end of the plant. Leaching could not recover all of the copper. In 1923, a small flotation plant was installed at the north end of the leaching plant to process the small ore particles known as slimes and sands.

Unprocessed Field note material exists for this structure: N1050

Survey number: HAER AK-1-E

Building/structure dates: 1915 Initial Construction

Building/structure dates: 1923 Subsequent Work

Building/structure dates: 1935 Subsequent Work

Building/structure dates: 1938 Subsequent Work

National Register of Historic Places NRIS Number: 78003420

mills copper mills mine buildings ore industry copper mining mining alaska alaska support office justine christianson erik dorsett naomi hernandez historic american engineering record chris houston laura houston holly lott jet lowe steven m peterson mark schara kennecott copper corporation copper river valdez cordova census area northwestern railroad building plans library of congress national register of historic places

1969 - 1980

Library of Congress

https://www.loc.gov/

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