Big Muskie was a coal mining Bucyrus-Erie dragline owned by the Central Ohio Coal Company (formerly a division of American Electric Power), weighing nearly 13,000 metric tons (13,000 long tons; 14,000 short tons) and standing nearly 22 stories tall. It operated in the U.S. state of Ohio from 1969 to 1991.
Design specifications and service
The Big Muskie was a model 4250-W Bucyrus-Erie dragline (the only one ever built). With a 220-cubic-yard (170 m3) bucket, it was the largest single-bucket digging machine ever created and one of the world's largest mobile earth-moving machines alongside the Illinois-based Marion 6360 stripping shovel called The Captain and the German bucket wheel excavators of the Bagger 288 and Bagger 293 family. It cost $25 million in 1969, the equivalent of $161 million today adjusted for inflation. Its bucket could hold two Greyhound buses side by side. It took over 200,000 man hours to construct over a period of about two years.
|Model:||4250-W, "Big Muskie"|
|Weight:||27,000,000 pounds (12,000 t)., or 13,500 short tons.|
|Bucket Capacity:||220 cubic yards (170 m3), 325 short tons (295 t).|
|Height:||222 feet 6 inches (67.82 m).|
|Boom length:||310 feet (94 m).|
|Machine length (boom down):||487 feet 6 inches (148.59 m).|
|Bucket weight (empty):||230 short tons (210 t)|
|Width:||151 feet 6 inches (46.18 m). (comparable to an eight-lane highway)|
|Cable diameter:||5 inches (130 mm).|
|Electrical power:||13,800 volts|
|Mobility:||Hydraulically driven walker feet|
Big Muskie was powered by electricity supplied at 13,800 volts via a trailing cable, which had its own transporter/coiling units to move it. The electricity powered the main drives, eighteen 1,000 horsepower (750 kW) and ten 625 horsepower (466 kW) DC electric motors. Some systems in Big Muskie were electro-hydraulic, but the main drives were all electric. While working, Big Muskie used the equivalent of the power for 27,500 homes, costing tens of thousands of dollars an hour just in power costs and necessitating special agreements with local Ohio power companies to accommodate the extra load. The machine had a crew of 5, and worked around the clock, with special emphasis on night work since the per kilowatt-hour rate was much cheaper.
Once it had stripped all the overburden in one area of the pit, it could move itself short distances (usually less than a mile) to another pre-prepared digging position using massive hydraulic walker feet, although due to its 13,500 ton weight it traveled very slowly (1.76 inches per second (4.5 cm/s), roughly 0.1 mph) and required a carefully graded travelway with a roadbed of heavy wooden beams to avoid sinking into the soil and tipping over or getting stuck.
During its 22 years of service, Big Muskie removed more than 608,000,000 cubic yards (465,000,000 m3) of overburden, twice the amount of earth moved during the construction of the Panama Canal, uncovering over 20,000,000 tonnes (22,000,000 short tons) of Ohio brown coal.
Increased EPA scrutiny and a rapid drop in demand for high sulfur brown coal following the passage of the 1977 Clean Air Act, coupled with regular yearly increases in electricity costs and continued public opposition to strip mining operations in Ohio eventually made Big Muskie unprofitable to operate, and it was removed from service in 1991. Attempts to sell the machine to another coal company found little interest due to the massive costs involved in dismantling, transporting and reassembling the machine. Additionally, by 1991 the few US coal companies still practicing open-pit mining had transitioned to smaller, newer, and cheaper digging machines with much lower operating costs. The only remaining large-scale open-pit brown coal operations that might have been suitable for Big Muskie's design were located at the Garzweiler mine in Germany, where more efficient giant bucket wheel excavators--the largest of which could remove more than twice the overburden of Big Muskie per day, and with lower power consumption--had long since made giant draglines obsolete.
After sitting inoperative for 8 years, the final act for Big Muskie came in 1999 when the state of Ohio and the Environmental Protection Agency began moving to enforce the Surface Mining Control and Reclamation Act, which required all equipment be removed from former strip mines so the sites could be environmentally remediated. Since further delays would result in millions of dollars in fines, and the cost of moving the obsolete machine would also run well into the millions, the COCC opted for immediate on-site scrapping. Despite calls by enthusiasts and historians for Big Muskie to be relocated and made into a museum, in late 1999 the machine was broken down and sold for $700,000 in scrap to the Mayer-Pollock Steel Corporation. The massive bucket was preserved and relocated to a newly constructed Miners Memorial Park in Morgan County at . Although presented by the COCC as a consolation gesture to those who had advocated for the entire machine's preservation as a museum, the bucket was actually donated primarily because Mayer-Pollock determined the hardened steel of the bucket was too thick to cut with acetylene torches and would cost more to cut with explosives and thermal lances than the metal itself was worth in scrap.
A wildlife park called The Wilds, which opened in 1994, was created from 10,000 acres (40 km2) of the land stripped by Big Muskie and later reclaimed. It is home to numerous species of African, Asian, and North American fauna.
|Wikimedia Commons has media related to Big Muskie.|
- Tribute page, with pictures
- Miners' Memorial Park—Noble County tourism website
- Attraction listing at Roadsideamerica.com
- The Wilds –- wildlife park constructed on land mined by Big Muskie