dumexpasaribu

Hi Nikolay, thanks for your message, sorry for late reply..
I was doing my thesis (BSc.) in 2006 on Grasberg Mine. At that moment I was interested in mineralogy, alteration and structural geology, that’s why I did some works about mineralogy. But at the end of 2006, as an opportunity came, I joined an oil company. Anyway, Grasberg is an interesting area of porphyry copper, It’s an open pit mine, started in 1970s and will be finished soon sometime in 2018. But there are some underground ores (mines) around this area, and still available until to 2040s. How is the mineralogy? well, I dont remember alot, but more aless the alteration zones: phyllic, prophyllitic, Heavy Sulphide Zone and Transition zone. The original lithology is Miocene Limestone, intruded by Pleistocene Igneous Rock. So we can see the skarn deposit in this area also. I’d ever seen the visible gold also at the porous altered limestone. I can send you the published paper about this area if you want..let me know then. Thanks Nikolay, nice to meet you through this blog.

Regards,
Dumex