Morning Arcos,
If I remember correctly Mimosa is the dominant species of Madera, a hard wood with dark heartwood and wonderful grain. If it's been stored off the ground some of it should be okay, the sapwood may be riddled with lil' beasties, but then again you may be lucky.
It depends what you want to turn from it. If it's Utility pieces and maybe the beasty tracks will be too much, if Decorative work, I (personally) don't have a problem with the holes etc as they are part of the history of the wood.
Euc, I've tried to dry this stuff, it cracks and splits like crazy. It's a rough fiberious timber with a dull grey colouring. I've been told reciently you have to use it very green if you want to get anything from it. personally, I'd definatley call the Euc firewood, I'm sure it will smell great as it burns.