ORIENTASI INTI BATUAN HASIL PEMBORAN PADA RANCANGAN LERENG TAMBANG EMAS TERBUKA ARAREN DI PT. TAMBANG TONDANO NUSAJAYA, SULAWESI UTARA
Abstract
Makalah ini mempresentasikan pendekatan penyelidikan geoteknik untuk mengetahui sebaran orientasi bidang diskontinuitas di bawah permukaan melalui pemboran geoteknik dengan orientasi inti batuan (rock core orientation) sebagai tahap awal pada rancangan lereng tambang emas terbuka Araren. Tiga lubang bor ditempatkan pada bagian timur, selatan, dan barat pada rancangan lereng akhir tambang terbuka. Metoda pemboran inti dimulai dari permukaan untuk mengumpulkan informasi massa batuan dan bidang diskontinuitas. Orientasi bidang diskontinuitas pada inti batuan hasil pemboran (oriented core) digunakan untuk mengamati potensi masalah kestabilan jenjang pada lereng batuan. Hasil penelitian menunjukkan bahwa potensi longsoran bidang, baji, dan rebah berpeluang terjadi dan tersebar pada lereng tambang di lokasi pengamatan.
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