Here is a little video that covers a lot of that location. http://www.youtube.com/watch?v=_-PTDJfKfnI
Modeling B&O in the early 50's.
A simple You-tube search for Lamberts Point coal dumper shows several results:
A discussion of the various piers and a number of photos are found in Chapter 8 of Norfolk & Western Railway: Pocahontas Coal Carrier by Richard E. Prince (1980).
Bill
If you are modeling the N&W and not the Norfolk and Southern, You need probably some documentations of the two old pier which you can easily find on the historical website of the N&W, www.nwhs.com
You will find picture of the old high lift coal dumper and the famous elevator of the other pier.
Plan of the dumper are aviaible.
Sorry I made a mistake whith the net address of the Norfolk and Western historical society
The address is www.nwhs.org
Check out the MR insider video on the National train show, it features a HO scale fully functioning coal rotary dump.
NS has a second video about Pier 6, which was opened in 1962.
https://www.youtube.com/watch?v=4rpwxUWJvM8
As for the rotary dumper, I'm not sure if that is original equipment or not. But, given that N&W and Southern Rwy didnt merge until 1982 (1997, interesting wikipedia note), Pier 6 works for you depending on your time period.