marginal grading copper mines

For those of you who question my concern over wether PMH have a deposit worth mining, it may pay to look at other operations around the world.

Below are some links you can follow to look at world class operations.

You will note that the only really succesfull low grade operations are in Sth America and near surface.

Grades at or around 0.5% are at surface and extracted via a leaching operation. Also important to note labour and plant costs a fraction of other countries, particularly Nth America

Sites around the world
http://www.mining-technology.com/projects/

Low grade copper operations
http://www.mining-technology.com/projects/collahuasi/

http://www.mining-technology.com/projects/lomas/


An example of a low grade operation in Nth America - key once again was deposit was at surface. PMH's is deep (no chance IMO)

http://www.mining-technology.com/projects/highland/