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Location: 140 km NE from Palopo, Indonesia
SorowakoIndonesia92984
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Mining scale, mining and mill throughput capaciites.Full profiles of select mines and projects.
Shaft depth, mining scale, backfill type and mill throughput data.Full profiles of select mines and projects.
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Camp size, mine location and contacts.Full profiles of select mines and projects.
The other shareholders of PTVI are: PT Mineral Industri Indonesia (Persero) (MIND ID) with 34%, public float with 20.64%, Sumitomo Metal Mining Co., Ltd. (Sumitomo) with 11.48%, and Manara Minerals with 3.38% (through its 10% ownership in VBM).
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Nickel laterite deposits in the Sorowako and Petea area are generally classified into two main types, West Block and East Block types, depending upon the nature of bedrock, the level of serpentinisation, ease of mining, size of boulders, degree of fracturing of the bedrock, optimum screen fraction that carries nickel grades, and the silica-to-magnesia ratios in the mineralisation. West Block type deposits These deposits are developed over a relatively unserpentinised peridotite bedrock; commercially mineable grades are confined to the -1" fines fraction; and silica to magnesia ratios are high (2.2 to 2.6 range). West Block type deposits are categorized into Types 1, 2 and 3, depending on the degree of fracturing in the bedrock and the size of the resulting boulders. Type 1 deposits are the most difficult to mine due to weak fracturing of the bedrock and the resulting large size of the boulders. Type 2 and Type 3 deposits are successively easier to mine and are formed over more fractured bedrock resulting in boulders within the mineralisation profile that mining equipment can handle. Optimum nickel grades in all West Block type deposits are confined to -1" screen fraction. Oversize is generally barren or very low grade. Exceptions exist in breccia mineralisation where siliceous garnierite carries respectable grades in the +1" fraction. East Block type and Petea depositsThese deposits are developed over bedrock that is much more serpentinised and characterized by generally low silica to magnesia ratios. They are further categorized into three types based on upgrading characteristics of the mineralisation as follows: 18" mineralisation type in which all fractions up to 18" size are mineralisation grading. This is also referred to as "Pure East Type mineralisation". 6" mineralisation type in which only material less than 6" in size is mineralisation grading; oversize rock is low grade and needs to be rejected. 1" mineralisation type in which only -1" material is mineralisation grading and all oversized material is waste. This mineralisation type is further divided into two types depending on the olivine content of the +1-6" size fraction: Low-olivine -1" mineralisation type in which the olivine content of the +1-6" rock is generally less than 22%. This mineralisation type can be screened at 1" size for maximum nickel upgrading, or screened at 6" size for maximum mineralisation recovery. In either case olivine content is acceptable for the electric furnaces. High-olivine -1" mineralisation type in which the olivine content of the +1-6" fraction is generally more than 22%. This mineralisation type must be screened at 1" size to ensure that excessive olivine does not enter the electric furnaces. East Block 6"/18" mineralisation type form an arcuate zone extending from Sumasang in the north to Lamangka South and Fiona-Farah in the south-east. East of this zone, and up to the shore of Lake Matano, the area is underlain largely by -1" high-olivine mineralisation type. East Block -1" low-olivine mineralisation type only forms irregular patches within the 6"/18" mineralisation type and the -1" high-olivine mineralisation type. In the Mahalona North area, the 6"/18" mineralisation type has numerous small raisin-like zones of the other two East Block mineralisation types. Petea area was originally classified as -18" mineralisation type but was not supported after reviewing borehole and test pit data. Recent results from mining (screening results) indicate that Petea is generally a - 6" mineralisation type. Petea will continue to be treated as -6" mineralisation. The -1" mineralisation type identified in Petea is treated at -6".
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