The #1 shut down early (1877) The 2/3 shared a hoisthouse, my sources say there is very minor ruins to be found, but I could not find them.
Note: I have included a TrailHead... Use It. It might seem easier to stop at the old RR line and bushwack uphill, but don't. The old foundation by the TH is listed as Boiler/Pumphouse.
I'm giving this a 3.5 for terrain, but if you go the wrong way, it could be 4+
A hint, climb the rockpile as soon as you can as the walk on top is the easiest way to the cache.