The Boston and Montana Consolidated Copper and Silver Mining Company (the "Boston and Montana" or "B&M") was a mining, smelting, and refining company which operated primarily in the state of Montana in the United States. It was established in 1887 and merged with the Amalgamated Copper Company in 1901. The Amalgamated Copper Company changed its name to Anaconda Copper in 1910, and became one of America's largest corporations. Historian Michael P. Malone has written, "Well financed and well managed, the Boston and Montana came to rank among the world's greatest copper companies."