MINING rate from four million tonnes to six million tonnes per annum .
The second opportunity at Tujuh Bukit is to develop a series of underground mines to exploit the massive porphyry copper gold deposit that underlies the oxide mine . “ We are currently doing the pre-engineering to put an exploration decline into the porphyry which sits below the oxide mine we are operating ,” Moorhead adds . “ That upper high grade zone ( UHGZ ) of that deposit is estimated to contain about 300 million tonnes at 0.8 percent copper and 0.8 grams of gold .” The decline will help Merdeka acquire the data needed to support a prefeasibility study for the first mass underground mine .
Sustainable mining The journey to developing one of Indonesia ’ s best deposits , and with that , one of its most reputable mining companies , has not been easy . Issues over ownership and permitting slowed progress before a single brick was laid . And once that had been taken care of , the company had the weather to contend
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