MINE DRAINAGE FACILITIES PLANNING IN PIT OF COAL MINING PT XYZ
Open pit mining is a mining method in which all mining activities or activities are carried out above or relatively close to the earth's surface. One of the consequences of mining activities is the change in the morphology of the mining area so that the topography of the mining area will decrea...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/61971 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Open pit mining is a mining method in which all mining activities or activities are carried out above or relatively close to the earth's surface. One of the consequences of mining activities is the change in the morphology of the mining area so that the topography of the mining area will decrease so that a pit will form. The formed basin has the potential to become a water storage area that can arise from both ground water and surface runoff. To anticipate the losses that are formed in the PT XYZ Pit, it is necessary to analyze the hydrological conditions in the mining area as well as planning a good and appropriate mine drainage facility so as not to interfere with the mining process.
The data used are daily rainfall data for Rain Measurement Station 2 (2013-2021 period) and mining progress for 2020-2030. Analysis of the hydrological conditions of PT XYZ was carried out by calculating the value of the planned rainfall intensity using the Mononobe equation. The results showed that PT XYZ had a planned rainfall value obtained from the Pearson Log Distribution of 118.66 mm with a rainfall intensity of 25.91 mm/hour in the 10 years return period. The catchment area is determined to be able to calculate the runoff discharge. From the total catchment area in the Pit of 4.99 km², PT XYZ also needs to make a drainage facility in the form of a trapezoidal open channel consisting of 3 categories with dimensions of width x height of 3 x 1 m; 5.6 x 1.8 m; and 7.6 x 2.3 m, as well as a triangular shape with dimensions of width x height 2.77 x 1.2 m. 47 drop structures to control the speed of water in large elevation channels. Multiflo pumps type 420EXHV, totaling 43 pieces to drain water in four sumps in the pit with the option of dry wells in 4 days. As well as two retention ponds and a settling pond each for water quality treatment. |
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