Beautiful certificate from the Calumet-Corbin Mining Company issued in 1910. This historic document has an ornate border around it and is hand signed by the Company's President, J. M. Wilcox and Secretary, M. O'Brien and is over 95 years old. The Calumet-Corbin Mining Co. owned the Gold Seal and Gold Pan claims. Free gold occurs in a vein of gray quartz in porphyry and schist. Ore samples were said to assay from $600 to $4880 per ton. The company had property in Montana, Idaho and Colorado. The company was incorporated in the Territory of Arizona and had their corporate office in Laurium, Michigan.