For what it's worth, the average open pit mine in Arizona today is producting from ores that are 0.35 to 0.5 percent copper (though some may now be closing temporarily owing to low prices and higher costs). Anything above these grades is considered high grade material for open pits.

The new underground mine going in at Superior, AZ will be exceedingly deep, but with ores expected to return, I think, somewhere around 1.8 percent (inclusive of by-products). The scale here is what matters, however, as this may be the largest single source of copper ever found. Billions are being invested just to open the mine and it requirs the partnership of the two largest mining companies to do it - mega mine, mega costly.

By the time the Copper Queen at Bisbee swiched to open pit mining, after some 85 years of undergound workings, grades had declined to FOUR percent - very high grade by today's standards, and they continued to produce for another 15 or so years by opening the Lavendar pit on top of old underground workings.

My point is, 20-23 percent copper at or near the surface, and not including associated other economic minerals, can be a stunningly fantastic, and very nearly unique start for something that could well be in production for many decades, and while rich other sources of copper dwindle from global markets.

All possible, but drilling will tell the tale.

VP