Bucket and cab of The Silver Spade at Harrison Coal and Reclamation Park on Stumptown Road
The Silver Spade was a giant power shovel used for strip mining in southeastern Ohio. Manufactured by Bucyrus-Erie, South Milwaukee, Wisconsin, the model 1950-B was one of two of this model built, the other being the GEM of Egypt. Its sole function was to remove the earth and rock overburden from the coal seam. Attempts to purchase and preserve the shovel from Consol for $2.6 million fell short, and the shovel was scrapped in February 2007.
Entire operation of the shovel is controlled by two hand levers and a pair of foot pedals.
Digs 315,000 lb (143 metric tons) of earth in a single bite, swings 180° and deposits the load up to 390 ft (119 m) away from the digging points at heights up to 140 ft (42.5 m).
Machine's four 25⁄8-inch-diameter (67 mm) hoist ropes total 3,000 ft (914 m) in length.
Fourteen main digging cycle motors are capable of developing a combined peak of 13,500 hp (10.1 MW) at peak load.
Automatically leveled through four 54-inch-diameter (1,400 mm) hydraulic jacks.
Swings a 105 cubic yard (80 m3) dipper from a 200 ft (61 m) boom and a 122 ft (37 m) dipper handle.
The "GEM of Egypt", the other large shovel, has similar statistics concerning size and weight, etc. The primary difference is the bucket and boom. The GEM is a 130 cubic-yard (99.4 m3) bucket and 170 ft (52 m) boom, while the Spade sports 105 cubic-yard (80 m3) bucket and 200 ft (61 m) boom.
The design is unusual, as it uses a Knee action crowd, and only these two Bucyrus-Erie 1950-B's were fitted with this technology. The technology was a requirement of the owners and had to be licensed from Marion Power Shovel, with Marion being allowed to use Bucyrus-Erie's cable crowd system in return.