Rio Grande Branch Lines?

Hello everyone! I hope you are all safe and cozy at the moment. When looking through the white pass region I get curious by all of the little branch mining railroads in the area. From what I can tell however the Rio Grande did most of the switching themselves. My question is were there any mines or large industries that had their own porter type (or larger) locomotives that brought goods to the Rio Grande. I know of the Shay that serviced Dolores (if I can remember right) for the RGS but I am curious what others there might be. Any info is appreciated and I hope you all are having fun with your families.