Dairi Stream Flow
The Dairi mine site is a high grade zinc and lead mine in North Sumatra. The project is now owned by PT Dairi Prima Mineral, who purchased Herald Resources in 2008. A number of lead/zinc deposits were discovered in the area in the late 1990’s.
Feasibility studies have been completed and planning for construction of the mine is underway.
The mine site is located in a hilly area with high rainfall. Annual rainfall is some 4,000 mm per year and there is frequent heavy rainfall, particularly during the two wet seasons that the area receives each year. Streams in the area flow full after rainfall and have a high baseflow component, as water seeps out of the ground, meaning the streams often flow continuously.
Robin was engaged by Herald Resources to provide advice on monitoring streamflow and interpretation the data.
Work involved development of a plan and procedures to establish gauging sites and measure streamflow at several sites around the proposed mine site. Mine staff then setup the sites, undertook gauging measurements and collected streamflow data. Robin helped in deriving rating curves for the gauging sites, interpreting and reporting the data, including evaluate the potential to harvest streamflow for use at the mine.
The outcome from the work was a set of streamflow data that Herald Resources could use in feasibility and approvals planning.