i worked at bear for about 6 years, winter and summer seasons. worked on downhill trails years ago, one went right over one of the "graves" (just a big pile of rocks, just about the dimensions of a body) of the "indian burial ground".. It was creepy around there. There were dream catchers hangin from the trees and other weird shit where the piles of rocks were. they were located next to timberline, i seriously wouldn't doubt they have ceremonies at night there.
About the mines, yea those are there too... wouldn't really call them mines, more like holes, i don't think anything was ever mined out of them. Wouldn't trust walking down in them. i suppose they go down pretty deep, you know when you are gettin close to them becaue the air becomes colder (this is summer again). They are located like someone stated on the left hand side when looking up the mtn. like into the woods off cascade, at about where the tube park starts.