Guys, something has been in my mind for a few weeks now, and its making me go crazy.

I'm trying to find data on the historical price of sodium cyanide? Or what ever chemical is most used for extraction nowadays... do I hear bioextraction using plants anyone ;)

Current ways it is used? IE technical specifics. Lets say you have 1gr/ton of AU or 5 gr / ton or 10 gr /ton ...What are the exact economics.

Is it me or is it really hard to find easy to read data on this information.

Its probably because extraction techniques are wide and varied in composition and details, but still some guidelines ...

Anyone, I would be most grateful.