&sq=Qlik&lang=&file=File:%22Ursa_Major%22_dragline_at_Black_Thunder_Coal_Mine_(3911596414).jpg) Ursa Major in 2009
| |
| Class overview | |
|---|---|
| Name | 2570-WS Ursa Major |
| Builders | Bucyrus-Erie |
| Operators |  United States |
| Cost | US$50 million (1999) |
| In service | 2001-Present |
| Planned | 1 |
| Completed | 1 |
| Active | 1 |
| History | |
| United States | |
| Name | Ursa Major |
| Builder | Bucyrus-Erie |
| Laid down | 1999 |
| Launched | 2001 |
| Christened | 2001 |
| Commissioned | 2001 |
| Notes | Largest walking dragline currently in-service |
| General characteristics | |
| Class and type | Model 2570-WS-series Dragline excavator |
| Tonnage | 6,700 tonnes (7,385 short tons) |
| Length | 110 m (360 ft) (boom) |
| Propulsion | 2x hydraulically driven walker feet |
| Speed | 0.16 km/h (0.1 mph) |
| Capacity | Blade capacity: 160 cubic yards (120 m3) |
| Complement | 5 |
The Ursa Major (lit. Great Bear) at Black Thunder Coal Mine, Wyoming, is the largest dragline excavator currently in use in North America and the third largest ever built.[1][2] It is a Bucyrus-Erie 2570WS model and cost US$50 million. The Ursa Major was one of five large walking draglines operated at Black Thunder, with the next two largest in the dragline fleet being Thor, a B-E 1570W - which has a 97.5-metre (320 ft) boom and a 69-cubic-metre (2,400 cu ft) bucket - and Walking Stick, a B-E 1300W with a 92-metre (302 ft) boom and a 34-cubic-metre (1,200 cu ft) bucket.[1]
- ^ a b "Black Thunder Thermal Coal Mine, Wyoming". Mining Technology. Retrieved 11 January 2019.
- ^ Orleman, Eric. "Bucyrus Erie 2570WS "Ursa Major"". Stripmine.org. Retrieved 11 January 2019.