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Dear Ms. Stachnik,
Thank you for posting your question to History Hub! I reached out to a colleague at the National Archives in Denver, who indicated that it is very unlikely that their facility would have any information on the mining camp at Primero. If you have not done so already, his suggestions for local repositories to contact include History Colorado, Pueblo Library Special Collections, Trinidad History Museum, and the Trinidad Carnegie Library.
The Trinidad Carnegie Library does have a 1910-1911 City Directory for Trinidad, which may be of use if he did end up in Trinidad rather than Primero.
Best of luck with your research!
Hi Andrew, thank you for the response. I actually did contact several of the archives you mentioned with not too much success; but it was one of these that identified the location I looking for as Primero. I think I have reached the end of my search! Thank you again. joan