The Burrowers (2008)

Genre: Horror | Thriller | Western
Starring: Clancy Brown, Steph Delgado, David Busse, and Jocelin Donahue
Tagline: Evil will surface.
Plot: In the Wild West a rescue party sets out to find a family of settlers that has vanished from their home under mysterious circumstances.

http://www.imdb.com/title/tt0445939/
http://en.wikipedia.org/wiki/The_Burrowers