The importance of the need for water causes water to become a major factor in the sustainability of existing mining activities. In addition, the occurrence of silt deposition in the main pond is a separate problem which is very likely to cause silting of the main pond. This study aims to examine problems related to water and materials entering the mine. Based on the results of research using the calculation of the Gumbel distribution, through the Mononobe equation and rational formulas so that the runoff discharge is obtained where the total discharge that enters the washing pond is 710.81 m3/day. Thus, in order for the washing pond to optimally meet water needs, additional water is needed, which is 5,414.88 m3/day. To prevent silting of the main pond, periodic maintenance is needed, in this case the dredging of sedimentary material deposited in the pond. Based on the results of the study, it was found that 51,788 kg of solids were deposited in the pond carried by circulating water. With a reference of 60% of the pond capacity, the optimum time for dredging is once every 18 days. Pentingnya kebutuhan akan air menyebabkan air menjadi faktor utama dalam keberlangsungan kegiatan penambangan yang ada. Di samping itu, terjadinya pengendapan lumpur pada kolam utama menjadi permasalahan tersendiri yang sangat memungkinkan menyebabkan pendangkalan kolam utama. Penelitian ini bertujuan untuk meneliti permasalahan terkait air dan material yang masuk ke dalam tambang. Berdasarkan pada hasil penelitian yang menggunakan perhitungan distribusi Gumbel, melalui persamaan Mononobe serta rumus rasional sehingga didapatkan debit limpasan dengan total debit yang masuk ke dalam kolam pencucian sebesar 710,81 m3/hari. Dengan demikian, agar kolam pencucian dapat memenuhi kebutuhan air secara optimal, diperlukan air tambahan, yaitu sebesar 5.414,88 m3/hari. Untuk dapat mencegah pendangkalan kolam utama dibutuhkan perawatan berkala yang dalam hal ini adalah pengerukan material sedimen yang terendapkan di dalam kolam. Berdasarkan hasil kajian didapatkan sebanyak 51.788 kg padatan terendapkan di dalam kolam yang terbawa oleh air sirkulasi. Dengan acuan 60% kapasitas kolam, waktu optimum untuk dilakukan pengerukan adalah setiap 18 hari sekali.
Study of stability and pillar failure mechanism with a variety of methods have beencarried with empirical and analytical approach. H. Moomivand dan V.S. Vutukuri in 2008 doto research with physical model of coal cubic with ratio of 0,25 to 10 with surface of pillar ishorizontal, this research aims to investigated changes in the ratio of pillar on compressivestrength and pillar mine failure mechanism, to study the relationship do the physical modellingwith 5 variations of height of 5 cm – 40 cm each pillar geometry has 7 variatons inclinedsurface 0o-30o. Samples of the pillar of testing with direction of the axial load on the body pillaruntil failure. Other than that do to 2D numerical modelling with finite element methods withassisted of software Phase2 (Rockscience). Physical modelling result showed the value ofthe compressive strength and the strength of pillar will be increased with the increasing ratioof pillars w/h. Effect of change in the inclined surface pillar to the compressive strength andpillar of strength showed no behavioral changes in the compressive strength and the strengthof the pillars to change the angle of the surface of the pillar. Changes in strength factor andsigma 1 showed decreasing of the value when the angle of the pillar is increasing eventhough the changes in the value of the numerical modeling results are not significant.
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