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Location: 58 km SW from Middelburg, South Africa
Off the Van Dyksdrift Road, the farm GoedehoopMpumalangaMiddelburgSouth Africa1050
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The Khanyisa Collierie is located within the Witbank Coalfield. The northern extent of the Coalfield is defined by the limit of coal-bearing sediments of the Vryheid Formation which abut against pre-Karoo basement rocks of the Transvaal Sequence, the Waterberg Group and Bushveld Complex. The southern limit of the central sector of the Coalfield is marked by a series of Bushveld Complex inliers known as the Smithfield Ridge while in the east and west sectors, the boundary between the Witbank Coalfield and the Highveld Coalfield to the south is somewhat arbitrary. The five major coal seams of the coalfield are contained within a stratigraphic interval averaging approximately 70m in thickness. The seams are numbered, from the base upwards and include the No. 1 Coal Seam, the No. 2 Coal Seam (split into the No. 2 Lower Coal Seam and No. 2 Upper Coal Seam), the No. 3 Coal Seam, the No. 4 Coal Seam (split into the No. 4 Lower Coal Seam and No. 4 Upper Coal Seam) and the uppermost No. 5 Coal Seam.The No. 5 Coal Seam is not present at all. The No. 1 Coal Seam is not considered economic as it is either very thin (~1 m thick) or not developed. Similarly, the No. 3 Coal Seam is also not considered economic as it is on average only around 0.3 m in thickness.No. 1 Coal Seam The No. 1 Coal Seam occurs directly on top of the Dwyka Group sediments in both the Triangle and Catwalk Project areas. Undulations in the paleo-topography at the time of peat accumulation resulted in zones where the No. 1 Coal Seam did not develop. The coal is highly variable in nature, ranging from shaley to dull-lustrous. Due to the fact that the seam is thin with relatively poor qualities, it is not considered economic. The depth of weathering across the Catwalk and Triangle Areas averages 17 m. It has been modelled and considered when estimating resources.No. 2 Coal Seam The No. 2 Coal Seam is the main economic target. It is present in the Triangle Area as in-situ coal, and is on average 5.50m thick, with an average depth to roof of 40.9m (ranging from 38m to 43m). Triangle 2 has a S2 Upper Ply located directly above the main S2; it averages 0.56m in thickness and is mined together with the S2.Catwalk Project Area The No. 2 Coal Seam has been historically mined using underground board and pillar methods in the Catwalk area and therefore the majority of the resource area comprises roof and pillar coal. The average pillar height is 2.7 m, while the remaining roof coal ranges in thickness from 1.5 to 2.3 m. The depth to seam roof ranges from 21 to 27 m. The CV for both the roof and pillar coal is in the region of 22.5 MJ/kg. The No. 2 Seam is considered mined out at Catwalk; any remaining peripheral coal has been removed from the coal resource estimation.No. 4 Lower Coal Seam The No. 4 Lower Coal Seam occurs across the majority of the Triangle Area, with the exception of a few areas to the South where it has been eroded. The No. 4 Lower Coal Seam is not present in either Catwalk North or South. The No. 4 Lower Coal Seam lies on average 0.6m above the No. 3 Coal Seam, where it is separated by a sandstone band. The seam thickness is relatively constant, ranging in thickness from 3.7 to 4 m, averaging 3.84 m in thickness. The average coal quality is good; raw ash content around 25% and a raw CV of 22.7 MJ//kg. The seam is unaffected by either faulting or dolerite.No. 4 Upper Coal Seam The No. 4 Upper Coal Seam occurs over the majority of the Triangle Project Area, with the exception of a few areas in the south, where the seam has been removed by erosion. The seam is on average 4.10 m thick and occurs directly above the No. 4 Lower Coal Seam. The coal quality is considerably poorer than the No. 4 Lower Coal Seam. The ash content is in the region of 39.70% and the CV is on average 17.20 MJ/kg.Dolerite and faultingThere is no dolerite or faulting within the Triangle resource area.
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