STUDY OF RAIN CHARACTERISTICS BY DURATION OF DAILY RAIN BASED ON A GREEN STONE MINING AREA PT AMMAN MINERAL NUSA TENGGARA

• Main Author: Eky Hermawan, Andre
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61896
• Institution: Institut Teknologi Bandung

Indonesia has very diverse rain characteristics. Indonesia is a country that has a high rainfall. This characteristics will distract the stability of the mine and the operation of mine. To solve this problem so important to characterize the rain to optimized or good mine drainage system, especially for the Green Stone Area. This study aims to determine the cumulative percentage of daily rainfall for a certain duration and its effect on the instensity of short duration rain and how does the characteristic of duration affect mining operation activities. This analysis was performed by using MS Excel and SPSS Sofware. This Analysis was carried out by determining the probability of rain for each duration and how does the characteristic of duration affect mining operation actiivities. At Green Stone Mining, 100% daily rainfall occurs for a duration of 2 hours or it’s a short duration.. At the Green Stone Mining, dominant rainfall will dominant at 12:00 to 16:00 with a total value 37.5% of daily rain events and total value of 47.45% of total daily rainfall. Therfore, in the period 12-18 it is not optimal for mining operations to be carried out. In extreme rain intensity, for duration 10 minutes, the probability is 27.61%, for duration 30 minutes, the probability is 56.67%, and for duration 60 minutes, the probability is 77.75%.