Armstrong Dock & Preparation Plant The Armstrong dock and preparation plant are located on Kentucky's Green River adjacent to Armstrong's mines and consist of a barge loading and unloading facility and a preparation plant. The unloading facility utilizes a 1,400 ton-per hour Sennebogen handling machine to unload coal barged from Equality Boot mine.The loading facility is capable of loading 2,500 tons per hour onto barges on the Green River. The Armstrong preparation plant is a 1,200 raw ton per hour facility capable of blending up to five different types of coal via a nuclear analyzer.