The Quincy Mining Company Stamp Mills Historic District is a historic stamp mill (used to crush copper-bearing rock, separating the copper ore from surrounding rock) located on M-26 near Torch Lake, just east of Mason in Osceola Township.

[3] In the mid-1880s, the federal government set minimum harbor lines and stiff penalties for breaching them,[4] and eventually filed suit against the Quincy Mine for dumping in Portage Lake.

[5] In addition, Quincy was in the process of acquiring the nearby Pewabic Mine, and management knew they would need to increase the company's stamping capacity.

[7] After some analysis, the Quincy management decided on Torch Lake as the site for the new mill and purchased 300 acres on the shore,[5] some six miles east of the previous location.

[10] An elevated conduit carried water and steam over the road to the mill, and handling facilities were built at the dock.

[16] Over the next two decades, minor alterations were made to the structures of the complex (including the erection of a new 175-foot smokestack for the boilerhouse in 1916)[17] while the milling process and machinery were continuously refined.

However, the rise in the price of copper during World War I provided both impetus and resources for expansion of the site.

[22] As the Depression wound onward, copper prices rebounded, and the mine and mills were refurbished in late 1937 and re-opened on a limited scale in early 1938.