I'm always happy to hear if one of my posts helps someone. Every once in a while, I stumble onto some useful info.
As to your site. Obviously, surface mining has removed any relic hunting prospects from quite a bit of your sites land area. It sounds like the headquarters site was placed on or near what is referred to as the Military Ridge. The military, when on the move, stayed off of the highest ridgelines to avoid being skylined to the enemy. They would travel just below the actual top of any ridge. UNLESS, the terrain made it absolutely necessary to move on the highest points. For camping, the same idea would be followed, plus, being low on the hillside helped to stay out of the winds.
If you are confident that you've located the headquarters site, start there and work outward in spiralling track. Don't worry about doing in depth MDing now. What you'll be looking for is patterns. Also, you'll be watching for any trenching and CW huts dug into the hill side. Tracing along the top of the ridge on the hunt for lookout / guard posts would be a good idea, too. Personally, I would not waste my time searching the mined areas. Those mining companies scrape off everything. If you can get down to the water course (safely), look for places that provided easy access to the water. In trench-like terrain, there were most likely good places and bad places to gather water. The privates put on water detail would have used the waaaaay easiest route to the water.

(been there; done that) Look for goodies at those spots. Depending on how long the camp was there, any camp trash they could not bury easily in their immediate area was most likely carried up and over the ridgeline to be buried for sanitation purposes because throwing trash into the creek / river would have been really stupid. If at all possible, it might be a good idea for you to walk the area of the headquarters (while the snakes are still in their dens) without you detector and simply LOOK at the area in search of disturbed ground resulting from those dugouts and trenches. A very good idea would be to carry a good camera--digital if possible-- and take as many photos as you can of the area and the "lay of the land". Then study the pics at home on your computer. Karl Von Muller wrote in one of his books that a camera sees everything that the naked eye misses. In other words, when studying good photos it is not unusual to spot details that you overlooked while eyeballing the same scene.
It is very possible that the road you mentioned does follow the CW era road. In rough country, road builders usually took the easiest routes. At least back then.
Again, that CD,
Exploring Civil War Campsites by Dave Poche and Wayne Rex would really help you decipher and evaluate your site. And, no I'm neither one of these guys and I'm not getting any pay for advertising the CD. Whenever I find some really useful info sources, I spread the word as much a possible. Those 2 guys put together a book / CD that is worthy of at least a Masters Theses (misspelled)
