Any relatively simple methods for modeling dust transport?

I'm trying to look into making some GIS models to examine sulfide mining dust transport. (I know that it's a bit specific).

Anyways I need to crunch numbers on how far a grain will go based on it's weight and applied velocity. For the sake of simplicity and avoiding hellish math i'm going to assume every grain in the model is round and of the same density.

Input Weight and velocity = distance traveled somehow?

I'm really at a loss for a way to simulate how the grain gets "picked up" in the air and how it "falls out" eventually. Seems like the math might be a bit more compicated then I'm thinking?