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The Assessor Card for 501 Jefferson, dated 1948, does not contain a date of construction, but states that the house was relocated from the Columbine Mine in 1948. This date is repeated on the Boulder County website, which is generally thought to have adopted the information from the Assessor Cards, at least for Louisville properties. However, on the County website it is instead given as the date of construction. Boulder County has sometimes been found to be in error with respect to the date of construction of Louisville buildings, so it is important to look to other evidence of the construction year. It appears that the date of construction of the house at the Columbine Mine camp is not known. The Assessor Card states that the house was relocated and remodeled in 1948, not constructed in that year. Specifically, the field for the "Date of Construction" is empty and there is a handwritten notation on the card under the field for "Major Alterations or Additions." This notation states the date of 1948 and says "Old House moved in + Remodeled." Underneath that, an additional handwritten notation states: "House moved from Columbine mine a remodel job." For these reasons, the date of 1948 is not accurate as a date of construction, but is accurate as a date of relocation and remodel. The original date of construction is not known, but according to a USGS map of mines in the area (USGS i-2735 produced in 2000, viewable here: https://pubs.usgs.gov/imap/i-2735/ ), the Columbine Mine was in operation from 1920 to 1946. It was located in Serene, Weld County, Colorado. Some Louisville residents worked as miners there. The following two undated photos from the collection of the Louisville Historical Museum show the mine camp at the Columbine Mine. 2