Namesinstone.com has a list of burials in the Salt Lake City Cemetery. Otherwise they have an on-site office open from 8:30-4:30 Monday thru Friday
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The state has a database of burials at https://utahdcc.secure.force.com/burials. A search for her at this website (Catherine Malin, died 1866) shows that she is buried in plot B_14_7_2W. You can visit the cemetery's website at https://www.slc.gov/parks/city-cemetery and locate B-14 at the map on the main page. Good luck! Even though the cemetery is theoretically maintained, I have found 4 of my ancestors - one who died as recently as 1961 - whose markers are missing during this past week.
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