![]() This allowed any valuable metal dust particles left in the flue gases that precipitated down to that conical floor to be collected by a car on a track within the duct and sent back to the smelter for more processing. The floor of the stack is generally conical leading 17 feet (5.2 m) down below the brick chimney to a 5-by-33-foot (1.5 m × 10.1 m) rectangular grate, then into a 5-foot (1.5 m) square horizontal duct that exits the stack at the center of the downhill side of the foundation on its south-southeast side. The stepped bottom of the foundation fits the stepped rock formation upon which it rests. It is a hollow octagon, 89 feet (27.1 m) side to side on top and 99 feet 6 inches (30.3 m) side to side across its bottom, 33 feet (10.1 m) high on its downhill side and 21 feet (6.4 m) high on its uphill side, a third of the foundation being below ground. It is 30 feet (9.14 m) high above ground at its downhill side and 10 feet (3.05 m) high above ground at its uphill side. The lowest part of the stack is a concrete foundation or footing that is built on sloped ground with a grade of 21% (12°) because it is just below the top of a hill. The brick chimney weighs 23,810 short tons (21,600 t). Most are radial bricks that are curved to match a sector of a cylindrical wall. The stack contains 2,464,652 locally manufactured perforated tile bricks, each averaging 2.7 times larger by volume than the size of a normal brick. It has had 20 lightning rods around its rim since it was built (which are not included in its height). Its cylindrical portion plus the top 5 feet (1.5 m) of the octagon are encircled by many large steel rods (called bands) for reinforcement. The rest of the chimney is a slightly tapering cylinder with a top inside diameter of 60 feet 2 inches (18.34 m) (≈ 60 feet) and a wall thickness of 22 + 1⁄ 4 inches (0.57 m) (≈ 2 feet) just below a slightly flared top. The wall thickness of the octagon at its bottom ranges from 64 inches (1.63 m) (≈ 6 feet) at the center of a side to 102 inches (2.59 m) at each vertex. But the inner surface of the octagon is circular with an inside diameter of 76 feet (23.16 m) (≈ 75 feet) across its bottom. The base of the octagon was 86 feet 7⁄ 8 inch (26.24 m) (≈ 86 feet) side to side across its bottom before the loss of its terra cotta covering. When operational, the main flue carried hot exhaust gases to these openings and then into the stack from the smelter which was on the north side of the hill upon which the stack rests. Two large vertical openings are in the octagonal portion, each 12.5 by 60 feet (3.8 m × 18.3 m), on its east-southeast and south-southwest sides. ![]() The lowest 68 feet (20.7 m) of the brick chimney is an octagon, the vertices of which point to the cardinal and intercardinal directions, north, northeast, east, etc., while its sides face the secondary-intercardinal directions, north-northeast, east-northeast, etc. This was the height when new in 1918, but loss of the terra cotta that covered the top course of bricks since then reduced its height one or more inches. The overall height of the stack is 585 feet 1 + 1⁄ 2 inches (178.35 m) (≈ 585 feet), including a brick chimney 555 feet 1 + 1⁄ 2 inches (169.20 m) (≈ 555 feet) tall and the downhill side of a concrete foundation 30 feet (9.1 m) high. The stack and its viewing area are now the two-part Anaconda Smoke Stack State Park. The inside diameter at the bottom of the brick chimney is 76 feet (23.2 m) while that at the top is about 60 feet (18.3 m). A terra cotta coating covered the entire brick chimney when new, but by the time the smelter closed in 1981, most had eroded away except for the upper 40%, exposing most of its bricks and reinforcing rods. ![]() It is a brick smoke stack or chimney, built in 1918 as part of the Washoe Smelter of the Anaconda Copper Mining Company (ACM) at Anaconda, Montana, in the United States. The Anaconda Smelter Stack is the tallest surviving masonry structure in the world, with an overall height of about 585 feet (178.3 m), including a brick chimney 555 feet (169.2 m) tall and the downhill side of a concrete foundation 30 feet (9.1 m) tall.
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