Elaine, these records from the Missouri Archives suggest Samuel Lance died at Paducah, KY and was buried in the Mound City (IL) National Cemetery.

There is a S. L. Lange buried in this cemetery -
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=lange&GSbyrel=in&GSdyrel=in&GSst=16&GScntry=4&GSob=n&GSsr=201&GRid=22919627&

His service records may contain more data.