Headframes

One of the most distinctive features of the Butte-Anaconda National Historic Landmark District is the collection of thirteen historic steel headframes that punctuate the skyline of the Butte Hill.
The first headframes in Butte were built of wood. Anaconda Copper Mining Company (ACM) built Butte’s first steel headframe in 1897 at its St. Lawrence mine. It was 97 feet tall. Numerous other mines followed, including the West Colusa, Anaconda, High Ore, Steward (a smaller headframe than the 1902 headframe currently standing at the Steward), Diamond, Neversweat, and Leonard. As the Butte mines went deeper, the size of hoisting engines with their double drums grew, and the mines’ productive capacity increased. The configuration of the shafts changed as well, from a single compartment to multiple compartments. A two-compartment shaft had side-by-side compartments, each with its own set of guides that would allow a skip or cage in one compartment to descend into the mine while the other was hoisted up. A three-compartment shaft had a third compartment next to the two producing compartments that would allow an auxiliary (or “chippy”) hoist to operate independently of the two main compartments. That would allow skips in the two main compartments to hoist ore throughout a shift without being interrupted by men or materials being lowered into the mine during the shift.
Important components of a steel headframe are its four legs, sheave wheels at the top, and vertical guides which extend down into the shaft. The two legs adjacent to the shaft are vertical to support the sheave wheels and the weight of the cable and loads of the skips extending down into the shaft. The two legs between the shaft and the hoist house are diagonal to brace the headframe against the lateral load created by the hoisting engine that is drawing a cable in with a load of ore on the other end. One can tell how many compartments are in the shaft by the number of sheave wheels at the top of a headframe. A two-compartment shaft will have two sheave wheels, and a three-compartment shaft will have three, with the third often off to one side. The vertical guides extend from deep in the shaft to near the top of the headframe, because the skips had to be raised to a level high enough to dump ore or waste into chutes and bins.
The Headframes of Butte tour shows the locations of the thirteen steel headframes that survive in Butte. The headframe at the Orphan Girl mine is open to the public for the fee of admission to the World Museum of Mining. The headframe at the Original mine stands at the heart of Historic Uptown Butte, a short distance from the Butte-Silver Bow Public Archives. The Original mineyard is open to the public during the Montana Folk Festival and other events. Other headframes that are easily viewed from public thoroughfares include the Anselmo, Steward, Mountain Con, Lexington, Diamond, and Belmont.
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