"Anyone willing to play a bit of devils advocate to potential...

"Anyone willing to play a bit of devils advocate to potential downsides?"

Happy to oblige;

Successful leaching of chalcopyrite is the biggest risk. Comments on here that they've got ten years before they hit the chalcopyrite are correct but it's all about how the market perceives this project. The market will downgrade this to junk if they cannot demonstrate that they can leach the chalcopyrite as all they'll have is a ten year mine and other low grade uneconomical projects.

My suggestion would be that you use your gambling money for this one and keep your eye on any news, anywhere around the world, of progress leaching chalcopyrite. There's a copper shortage coming and 70% of the worlds remaining resources are stuck in low grade chalcopyrite. Refer Jetti Resources who seem to be at the forefront of this technology.

I'm bullish on CYM by the way