I'm an engineer "in the business". I help design plants like this.
There are two buildings. a wash plant and a heavy media plant. The wash plant to the lower left probably uses wet screens and scrubbers to remove clay and shale from the coal. The media plant, to the upper right, is used to separate harder rock from the coal.
The two round tanks are thickeners, the larger one probably for tailings and the smaller one for magnetite used in the heavy media process for refining coal.
A thickener is a settling pool fed off the bridge in the center. There are rakes on the bottom of the tank that slowly revolve around the tank. The rakes have blades on them that sweep any settled solids to the center. These solids are then pumped out with some of the water. The rest of the water is clean and overflows the top of the tank into a launder. This water can be reused in the plant.
Tailings are the waste material in the coal, sometimes called gob in some parts of the country. Magnetite is a fine magnetic iron ore.
For heavy media, the coal is fed into a rotating drum or a cyclone with a slurry of magnetite and water. The magnetite raises the specific gravity (density) of the slurry so that the coal will float and waste rock in the coal sinks.
The float and sink are recovered and the magnetite sticking to them is washed off on a vibrating screen. The magnetite is then cleaned in magnetic separators and sent back to the magnetite thickener.
There are three truck pockets on the left side. Two feed the wash section of the plant. One can be direct loaded into coal cars. The third goes directly into the heavy media plant.
The conveyors to the upper right are clean coal conveyors. It looks like the main run is to a storage silo and stockpile area. A reclaim conveyor comes back and then to a loading pocket, probably for loading unit trains. The conveyor to the far right also goes to a loading pocket, maybe for loading single cars, loading on another railroad, or loading a different grade of coal. The conveyor to the bottom center and then to the upper right is probably for coarse tailings. It would go to a disposal area somewhere out of the picture.
The pond to the lower center is for storm water and maybe water spilled in the plant. This gives the water a chance to settle out before it nis discharged into the nearby creek to the right of the plant.
The plant was not running when the picture was taken. It looks like it hasn't run for quite a while.
If you want more, I'm available for consulting ;)