Abstract
Tebo Agung Internasional Ltd is one of the companies in coal mining that employs the open-pit mining method. This sort of method will create a large basin that can accumulate water inside the mining pit. The drainage system is applied at the Pit-1 Site Semambu is mine-dewatering carried out by draining the water into the sump so that it can be pumped out of the mining area and prevent the runoff from coming inside through an open drainage system (ditch). The result of data analysis demonstrated that referring to the daily rainfall in 2010 – 2019 through the distribution of Log Person Type III, the maximum rainfall being planned was 508.019 mm/day within the return period of 5 years. The intensity of rainfall at the research site was 82.5 mm/hour having a rain duration averagely of 3.1 hours/day. Pit-1 Site Semambu had a catchment area around 469,317.15 m2 and a water discharge totally 61,238.81 m3/day derived from rainwater discharge of 48,530.48 m3/day and runoff water discharge 12,708.33 m3/day, whereas the capacity of the temporary accommodating pond (Sump) was 39,539.55 m3. The pump at the research site could not be operated anymore (broken). Accordingly, the recommendation that can be given to the company is changing the broken pumps with 4 units of multi fall 420 pumps having operating speed 1,300 rpm and actual discharge yielded by the pump 871.64 m3/hour. The pump worked for 14 hours/day and the total water discharge that could be produced was 12,202.96 m3/day. Open channel (ditch) at Pit-1 Site Semambu was the only one with accommodated discharge 1.27 m3/second. Thus, the recommendation that could be delivered to optimally prevent the runoff water coming into the mining area is by adding 2 ditches having the capacities of 0.90 m3/second and 0.75 m3/second which have been adjusted to the planned water discharge.
Highlights
Tebo Agung Internasional Ltd applies this open-pit method, which all activities are directly related to weather and climate, causing the mining front to face the water from rain and runoff
The recommendation that could be delivered to optimally prevent the runoff water coming into the mining area is by adding 2 ditches having the capacities of 0.90 m3/second and 0.75 m3/second which have been adjusted to the planned water discharge
The reason the researchers plan for 4 pump units is based on the calculation of the maximum flow of rainwater that enters on the first day it can be issued with 1 pump unit but it only leaves little room for sump capacity, and if the day it rains with the same discharge. , the sump capacity can no longer accommodate even though 1 pump unit continues to work
Summary
Tebo Agung Internasional Ltd applies this open-pit method, which all activities are directly related to weather and climate, causing the mining front to face the water from rain and runoff. In supporting the mining production process, a mine drainage system is needed, so that at PT. Tebo Agung International various infrastructures are made to control water flowing in the mining area, especially on the mining front. In supporting the running of mining activities, an effective and efficient mine drainage system is needed, marked by the absence of water at the mining front so it is necessary to install pumping so that pumping activities can work properly and create safe and comfortable working conditions for mine workers who can have an impact.
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