Mining Method. The mine is fully equipped with modern machineries and equipments for mining and overburden handling, mining operations are being carried out by opencast semi-mechanized method. Topsoil of 0.5 – 3.0 m is scraped through excavator and stacked at designated sites. Below the cover of top soil there are layers of murram and hard rock of weathered sandstone having thickness of 1.0 m to 3.0 m. below this lies massive sandstone varying in thickness from 4.0m to 20.0 m which is removed by blasting. Overburden is handled by excavator - dumper combination. The productive, around 1.0 to 10.0m, zone is exposed by excavating overburden. Mining of sandstone starts with separating the layer from natural bondage by chisel and hammering along cleavage plane / weaker zone. The stone layer breaks non-dimensionally depending upon free face available. It is then sized to possible dimension by chisel and hammer. Line drilling method is also used to split massive sandstone blocks. Finally, it is splitted along the natural split planes to yield single solid slab of desired thickness ready to use. Mineral will be transported to the processing plant. It will be cut into sizes as per market demand and packed. This is then transported outside by the end user’s. Mechanization The following machinery will be deployed in the mine: S. No. Name of machinery Make Nos. 1 Compressor Atlas 4 2 Chain pulley - 1 3 Crane (Coles) - 1 4 Diesel Power screw compressor - 1 7 Dumper - 17 8 Hydaulic crane Escort 8 9 Xxxx Xxxxxx Machine - 4 10 JCB - 1 11 Rock drill machine - 1 14 Tractor crane - 1 15 Tractor - 5 16 Water compressor - 1 17 Water Pump - 3 18 Water Tanker - 3 19 Wagon drilling machine - 4 Other auxiliary equipments required are:
Mining Method. A) Mining method, recovery factor, mining losses, processing loss. The reserves of mineral have been estimated by surface area method. Structural behavior and the control of mineralization the physical limits of the ore bodies such as strike length, width and depth extension has been defined. Based on the pit exist in the lease and level of confidence gained at the time of previous excavation the estimated reserves have been classified into 111 categories. The area has been calculated from sections. The area has been multiplied by the influence length of mineral on the cross section and then multiplied by the bulk density. This gives us the geological reserves of ore. The mineral is intermixed of soil, so the recovery is 85% of mineral. The remaining shall have 5% sub grade, 10% Waste.
Mining Method. The mining method employed at the Ovoot Tolgoi deposit could be described as open pit terrace mining utilizing large scale hydraulic excavators and shovels and trucks. Terrace mining is utilized where coal seams dip steeply and operating machinery on the coal seam roof and floor is not possible, due to the steep seam dips. Terraces, or benches, are excavated along fixed horizontal horizons and these benches intersect both coal and waste. Coal and waste are mined separately on each bench with dozers being used, as needed, to push coal or waste down to the excavator for loading onto trucks. This mining method allows large scale open pit mining to occur productively in steeply dipping coal seam environments. All waste is dumped ex-pit, as the steep dips preclude in-pit dumping. The open pit limits extend across the Ovoot Tolgoi Mining Licence boundary into the adjacent lease held by MAK. As described previously, the Company and MAK have a cooperation agreement in place to allow mining across the boundary, which stipulates that SGS is responsible for removal of MAK waste but MAK is responsible for mining of MAK coal. Accordingly, the current reserve estimate does not include any coal within the MAK lease that must be extracted as part of the Company mining operation. Therefore in the current mine plan, no revenue has been assumed for the MAK coal whereas costs have been assumed for stripping off the MAK waste.
