Something to do with treasure hidden in a mine,the red haired girl ghost is wearing a green dress.I think there is a m iner ghost as well,an old cowboy town,not much help I know sorry...

I'm going to guess I could be wrong lady in white

I'm going to make a guess, too:

The Meeksville Ghost (2001)
Starring Judge Reinhold, Tanja Reichert, Todd Jensen
The Meeksville Ghost (2001) - IMDb

I've only seen this once, very late one night, with the sound down. I don't recall if there's a redhead in a green dress. I know that a gunfighter's love for a young woman who gets killed figures into the mystery. I don't recall exactly where the treasure is hidden; I think it is proof of land ownership perhaps.

I'll keep thinking of other possibilities. Anything more you could think of would be a big help.