Dear Professor Majumdar,

there are certainly some elements with coincide with features typical of porphyry-type mineralization but I would very cautiously go on following up this way and interpret it as an economic target of porphyry type. Values of less they 1 ppm Cu will hardly attract anybody.

Best regards

H.G.Dill

Dear Professor Majumdar,

The possibility of seeing it as an economic target would amount to values greater than  1 ppm Cu.Detailed geochemistry and exploration work needs to be conducted to acertain economic viability.

Regards

Abdullahi A.M

Hello,

It looks like you have the ingredients for potential porphyry copper development with the alteration and sulphides present. The low copper value means the copper is enriched in other intrusive phases. Now you have to look for porphyritic phases of the intrusions, that is where the economic potential would be: by prospection, geochemistry (soils) and maybe geophysics (look for conductors or disseminated sulphides).

Dear Profesor Majumdar,

Porphyry-type Cu, Mo and Au deposits generally form in and around cupolas above larger source plutons. Your mention of sulfide cumulates makes me think you are near the bottom, not the top of the pluton. Unless the pluton is composite, and is intruded by the tops of younger stocks, this pluton may be too deeply eroded to be a good target for porphyry-style mineralization of economic grade. I'd look for dike swarms within the pluton that might indicate the upper manifestation of a younger intrusion at depth. 

Art Bookstrom

It looks a porphyry copper system but without economic grades. Geophysical (IP/RS) and geochemistry activities is recommended to realize the economic value. 

Good Luck

To Arthur,

Why you say the samples are near the bottom, not the top of the pluton just because of sulfide cumulates？

Thanks!

First of all I am thankful to the experts for their valuable opinions. In my perception, it is a hidden mineralization with  economic concentration at depth. Lower copper value is seen in terms of magma mixing model. I still believe that appropriate geophysical method would be necessary to detect the target. 

D. Majumdar

India 

Since cummulates accumulate downward, your mention of sulfide cummulates suggests you are not near the top of the intrusion that contains them, but what is the evidence to support interpretation of these sulfides as cummulates?