Well, Zinifex went down 1 aud because it's after exdiv date yesterday, but it went down an other 1 aud today - so the reason is not exdiv date.
Well, I have only two aussie stocks...but what mining stocks you have?
The stocks that pulled me up today were OXR, KZL, MLX, POS, GGY, ARE. I don't hold Zinifex so I don't track it religiously.