-> Ralph, JORC codes are Joint Ore Reserves Committee Codes. You can read more here: http://en.wikipedia.org/wiki/JORC
and here:
http://www.jorc.org/
But in short, a mining company has a responsibility to report its three Rs - reserves, resources and results (exploration results) to the public. The JORC code is the standard that is used.
I hope that helps.
