FUTURE IS BOOMING FOR BATAK LAND JUST DEPEND HOW THE PEOPLE & GOVERMENT DEVELOPE THEIR PROGRAMs.

October 23, 2008 at 11:31 pm (Uncategorized) (, , , , , , , , , , )

THE DAIRI ZINC-LEAD PROJECT, NORTH SUMATRA, INDONESIA

Discovery to Feasibility

 

Terence W Middleton

Manager International Exploration, Herald Resources Ltd. 50 Colin St, West Perth WA 6005

Key words: sediment hosted massive sulphides; “Sedex” zinc-lead deposits; “MVT” zinc-lead deposits; Sumatran Fault System.

ABSTRACT

Sediment hosted, massive sulphidic, zinc-lead mineralisation was first identified by Herald Resources Ltd in the Sopokomil district of Dairi Regency, North Sumatra, during preliminary reconnaissance and stream sediment sampling in late 1997, prior to granting of a Generation VII Contract of Work.  Staged exploration for stratiform, possibly sedimentary exhalative (“sedex”) style mineralisation resulted in the tracing over about 5km of strike on the NE flank of the complex Sopokomil Dome a series of horizons and lenses, referred to as the “Julu Sedex Zone” (JSZ) in laminated carbonaceous shale and dolomitic siltstones, of the designated Julu Member,.

Extensive, but lower grade base metal and silver rich mineralisation in several styles, in particular the designated “Jehe Mississippi Valley type”, has been discovered in the massive dolostone footwall units which form the core of the Sopokomil Dome. The local lithostratigraphic sequence is part of the poorly constrained Permo-Carboniferous age Tapanuli Group, the basal rocks

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