That one was used to shoot at "Injuns" sneaking around the corner.
Seriously, the bronze receiver indicates it is, or rather was, a Henry, that might have been used as a pry bar in an emergency. The "E.M. Co." could stand for "Elko Mining Co." but someone would have to "dig"
into the history of the area to be sure.
Company guns like that (they are fairly common in the PA coal country as well), were often bought used or as military surplus, rather than new, so there might be other markings as well.
Jim