I have read your posts to Leah and I think we might all be able to help each other.It seems like you have a lot of old Boulder newspaper info and there is a direct newspaper connection to the Wallings and several reasons why their relatives or friends might have "made the papers".
Will Walling was married to Louisa C. Clough. Their youngest child, Elmer, was born in 1872.The Wallings spent most of the year near their mills near Black Hawk and wintered in a house in Denver.
The Wallings divorced in Denver in or before 1875 and Mrs. Walling then married her childhood friend, the famous miner John C. Dunn on or about June 30, 1875 in Denver.
Mr. Dunn divorced his first wife Hester(Hettie)Baker in 1875 shortly before his remarriage and transfered many of his mine holdings to her as settlement - this probably made the papers is some form.
Shortly after the new marriage John C. Dunn adopted little Elmer who legally changed his name to Elmer Ellsworth Dunn.I have a tiny newspaper clipping that talks about Elmer at the age of 3 or 4 years petitioning the court to change his name to Dunn to "honor his step-father".(Don't know which paper it was in though.)
Elmer attended the mining college in Boulder and then became a mining correspondent for a Boulder newspaper (sometime around the 1890's to early 1900s)where he met his future wife, Lucy Morgan (full name: Sarah Abigail Lucille Morgan)who was also working for a newspaper - possibly the same one.They were married about 1903.
Elmer E. Dunn and Lucy Morgan were my great grandparents.
Also, Ellen G. White, one of the founders of the 7th Day Adventist movement was the aunt of Mrs. Walling and frequently visited the Wallings in Colorado, holding revivals at the Mills. She was well known and controversial at the time, so perhaps there is mention in the papers of her comings and goings or advertizements re: the revivals she held?
So, I am thinking if we can find info on Elmer and Lucy who worked for the papers and John C. Dunn who rumor says was in the papers quite a bit as he was involved in the Highland Mary and other famous mines in the area, then we may be able to back track to find more on the Wallings and the Hastings.
Perhaps there was a notice of divorce published that might say something about where Mrs. Walling's husband was at the time?or a notice re: the Walling/Dunn marriage or the Dunn/Morgan marriage that might have additional info? or perhaps Elmer might have mentioned experiences from his early life in an article he wrote that may give some clues re: the Wallings?
Would any of the newpaper extracts you have cover this type of material?