Abstract
Abstract. This study discusses optimal solution to handle water entering coal mining Block B PT.
Minemex Indonesia. Water comes from ground water and surface runoff that floods the ground
floor of the mining work area, causing coal cannot be carried out. To determination runoff and
groundwater discharge into the mining, we have to know its debit. We also determinate
dimensions of open channel, sump, and settling pond, and also capacity of the pump used. The
results, pit B mining PT. Minemex Indonesia has a total catchment area of 47.3 ha with
maximum daily rainfall of 94,44 mm/day. Total debit is 1,22651 m3/second, maximum capacity of
sump is 85.775 m3, with 123 m x 123 m surface dimensions, and 116 m x 116 m at the base and
6 m depth. The trapezoidal-shaped open channel sare located on the mining front to drain the
water to sump, and near the settling pond to drain the pumped water from the sump to the
settling pond. By using HDPE pipes and 3 units Coates HL-200 centrifugal pumps that have 63
meters maximum head and 107 liters/second maximum pumping debit, water will be pumped
into settling pond which has 5 compartments and 10.400,4 m3 overall volume.
Keywords: Catchment Area, Rainfall, Sump, Pump, Settling Pond
Minemex Indonesia. Water comes from ground water and surface runoff that floods the ground
floor of the mining work area, causing coal cannot be carried out. To determination runoff and
groundwater discharge into the mining, we have to know its debit. We also determinate
dimensions of open channel, sump, and settling pond, and also capacity of the pump used. The
results, pit B mining PT. Minemex Indonesia has a total catchment area of 47.3 ha with
maximum daily rainfall of 94,44 mm/day. Total debit is 1,22651 m3/second, maximum capacity of
sump is 85.775 m3, with 123 m x 123 m surface dimensions, and 116 m x 116 m at the base and
6 m depth. The trapezoidal-shaped open channel sare located on the mining front to drain the
water to sump, and near the settling pond to drain the pumped water from the sump to the
settling pond. By using HDPE pipes and 3 units Coates HL-200 centrifugal pumps that have 63
meters maximum head and 107 liters/second maximum pumping debit, water will be pumped
into settling pond which has 5 compartments and 10.400,4 m3 overall volume.
Keywords: Catchment Area, Rainfall, Sump, Pump, Settling Pond