Shouldn't take too much, Brenden.
When I heard about the boys wanting to dig a couple test pits back behind the office it made me wonder what was going on. There are a few old buildings back there surrounded by bare land, covered with old parts from equipment. (It's so unremarkable looking I didn't even take pics either trip there.) It would probably take the excavator half a day to clean it to bare soil. Then they would have to berm up the pit for the dry stack - Maisal runs his equipment well and I don't see many problems there - unless they call him back to fix the train tracks again.
The mill will take a little maintenance work. Everything will have to be fired up and have the bugs worked out. I was surprised that everything I checked was in as good of shape as it was after so many years. For example, I checked a few bearings on some of the sheaves and they ran smooth, I'd probably give them fresh grease and go. Even the belts didn't look too bad. I was thinking to myself, "Would I change these belts if I were to fire this thing up today?" I probably wouldn't need to - but since I'm anal about that kind of thing, I probably would. I'm sure there will be some oil seals that'll need replaced once they are broke in again.
The metal parts like gears and such? If it ran when they shut it down, I feel confident it'll run now. Do you have anything sitting in your back yard rusting away? Take it to Silverton and stick it outside behind the mill someplace - your grandkids kids will be able to visit it in the same shape you left it. High altitude with thin dry air is great for preserving metal. The equipment is stored in a dry building at 10,000'.