Pitkin to Mt Princeton. DSPP, DL&G & C&S . Pitkin Mill

Some of you might remember that I was recreating the Uintah Railway for Trainz rail sim, it took five years but I finally completed the route ( you can drive it for free if you have copy of Trainz 2019 ) and I've now moved on to making the DSPP from Pitkin to Mt Princeton by way of Alpine Pass tunnel.
I've bought all the available books, have the ICC report from 1918, have trawled the net for weeks looking for info, have hundreds of maps and images but its hard to find much info about the mines and mills that were on the route .There was a large mill in Pitkin, but even the ICC report doesn't state what it actually processed , does anyone have any info on this or any other mill or mine on this section of the route ?