Statement of Significance (as of designation - February 10, 1989):
Quincy Mining Company is an outstanding example of the growth and development of the United States copper industry from its earliest years through 1920. Between 1862 and 1882, Quincy ranked first nationally in copper production, making a singular contribution to the Northern effort during the Civil War. Quincy, along with the Calumet and Hecla Company, represents the major elements of the copper industry: mining and mining technology; immigration and ethnic settlement; corporate paternalism and company towns; and labor organization. The landmark includes a section of company housing.

Condition:
Severe physical deterioration of the #5 Boilerhouse smokestack, deterioration/weathering of many structures on teh Quincy Mine Site, Vandalism and theft of property at the #8 shaft Mesnard loation on the Quincy MIne Site, theft of property at the Enginehouse on the Quincy Mine Site, inappropraite alterations of residential properties.

House stabilization completed by the Keweenaw NHP on five Quincy Mining Company wood frame houses (2006). #5 Boilerhouse on the Quincy Mine site stabilized (2006), Enginehouse on the Quincy Mine Site stabilized (2006), Asbestos removed (2008), Barriers erected (2008), controlled removal of 10 tons of loose rock off the ceiling of the East adit (2008), Additional safety barrier constructed in the stope near shaft #5 on the 7th level (2008), Additional venetaltion system added in the east adit (2008), new roofing project currently in progress through the Keweenaw NHP on the Pay office Structure (2008).