Beautifully engraved certificate from the Calumet-Corbin Mines Company issued in 1916. This historic document was printed by the American Banknote Company and has an ornate border around it with the company's name on top center. This item is hand signed by the Company's Vice President and is over 89 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.