Dear Edi, So far I have not encountered the Au porphyry deposits in depth.   

thanks attention, sylejman

Depth prediction is tough.  The best we have accomplished to date is to understand the 'architecture' of a porphyry system based on mineralogy and rock type for each of its phases (i.e. hypogene, supergene etc.). Depending on the development of the system (temporal and spatial) each zone will be dimensionally different.  

thanks mr michael

Dear Edi, it is theoretically posible for gold mineralization, imposible for resources and moreover reserves.  These termines are defined as explored and potentially mineable mineralization having commercial significance

Dear Edi, Studies have shown that the most important industrial sources of Au genetically related magmatic activity with small sub volcanic intrusion.