As you drive around the Rocky Mountains you seem to frequently come across old mining cabins, no bigger than a modern day bedroom so it's quite unusual to come upon a large abandoned house like this.
Structurally, it seems in good condition and obviously a lot of work went into it. There's nothing around this area but sage and sand so I can only imagine that this was a ranch house for a large family or perhaps this was part of one of the many mining boom towns in Colorado and was built just prior to the minerals in the area drying up.
There is what seems to be a garage on the far right of the house so this might have been built a bit later than the other mining towns of this area. Of course this is all speculation on my part but some of the fun of coming across these empty dwellings is trying to figure out what brought them to this desolate area and what drove them out.