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Location: 18 km W from Sidikalang, Indonesia
Jl. Runding No. 1 A, Gerbang III-SidiangkatSidikalangIndonesia22216
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As of December 31, 2024, PT Bumi Resources owns 22,09% of PT Bumi Resources Minerals Tbk.
Zinc-Pb orebodies in the Dairi deposit are distributed along a 4-km SE-NW strike in the eastern flank of the Sopokomil Dome. From top downward, the rocks in the Sopokomil Dome consists of interbedded calcareous siltstones-sandstones (Dagang unit), interbedded carbonaceous shales-calcareous siltstones (Julu unit) and massive as well as brecciated dolostones (Jehe unit).The Anjing Hitam prospect is situated in the southeastern portion of the Dairi deposit. At the Anjing Hitam prospect, orebodies are hosted in the Julu unit and display stratiform and concordant morphologies.Two mineralized horizons are present, namely the upper and main mineralized horizons. The upper mineralized horizon occurs as lenses and it is sporadically distributed throughout the prospect while the main mineralized horizon is continuous. The orebodies attain maximum thickness of 30 m in the main mineralized horizon.The Dagang and Julu units are composed of quartz, carbonate minerals, muscovite and organic matter. Quartz and carbonate minerals are dominant in the sandstones and siltstones layers of the Dagang and Julu units while muscovite and organic matter are dominant in the shales layers of the Julu unit. Zircon and sphalerite occur in trace amounts in the Dagang and Julu units.According to ore minerals abundance and their textural relationship, the Anjing Hitam prospect hosts five ore types: (1) pyrite-rich massive ore, (2) sphalerite-rich massive ore, (3) bedded sulfide ore, (4) galena-rich breccia ore and (5) vein ore.Pyrite-rich massive ore is composed of abundant pyrite with sphalerite-galena intergrowth in the interstices.Sphalerite-rich massive ore is characterized by sphalerite-galena intergrowth with trace to minor amounts of pyrite.Bedded sulfide ore is identified as interbedded host rocks and sulfide-rich layers with individual layer up to 1 cm thick.The sulfide-rich layers are subdivided into pyrite-sphalerite-rich and galena-sphalerite-rich subtypes.Galena-rich breccia ore consists of host rock fragments cemented by galena with trace amounts of tetrahedrite, bournonite and pyrrhotite. Coarse-grained pyrite up to 3 mm in size also occurs in this ore type.Vein ore is associated with open-fracture filling in the host rocks and other ore types. This ore type is dominated by the sphalerite-galena intergrowth.
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