Release: Herald announces boost for Dairi Project
Thursday, January 3 2008 - 01:33 AM WIB
Lae Jehe has a resource of 6.5 million tonnes at 11% zinc and 6% lead and is the most advanced prospect to provide future mill feed for Dairi following its initial 7 year mine life.
Dairi?s feasibility study is based solely on the Anjing Hitam deposit, which has reserves of 6.5 million tonnes grading 14% zinc and 9% lead.
The latest metallurgical test work on Lae Jehe indicates similar zinc and lead recoveries at the same stage of the process to those achievable at Anjing Hitam.
The results are very encouraging in terms of the confirming Herald?s belief that Lae Jehe could provide mill feed that would take the Dairi project significantly beyond its initial planned mine life of 7 years.
As previously advised, a pre-feasibility program is being undertaken on Lae Jehe, initially comprising geotechnical/mining studies and metallurgical testwork.
Results from testwork on material from one Lae Jehe drill hole have been very encouraging.
The sample intentionally included 19% dilution with hanging wall and footwall material, and was subjected to laboratory batch flotation testing to simulate the circuit of the concentrator for the Anjing Hitam ore.
The results currently available indicate that recoveries of lead and zinc to their respective rougher concentrates are similar to those achieved to the same stage of the process for the Anjing Hitam ore, though at a lower lead grade for the rougher concentrate.
It is believed that adjusting the addition rates of the flotation reagents will result in acceptable concentrate grades and recoveries for both lead and zinc.
Herald is planning further testing to confirm this. (end of release)
Dairi Project Interests:
Herald 80%
PT Antam 20%