LEFT: Hillsboro, New Mexico Assay Office. On June 18, I noted that some people thought the Rattlesnake Mine Superintendent’s House was an assay office and I noted several reasons that was not likely the case.  To the left is the Assay Office in Hillsboro at about the same time the Superintendent’s House existed - it is in the middle of town, accessible to miners throughout the area, not on a hillside near a particular mine.