Global Geologist

PENDAHULUAN Pembangunan bidang pertambangan berwawasan lingkungan adalah kebutuhan penting bagi setiap bangsa dan negara yang mempunyai kekayaan bahan ekonomis pada tanah dan airnya. Perlindungan lingkungan diperlukan agar sumberdaya alam bisa diproduksi dengan memperhatikan kelangsungan hidup manusia kini, maupun untuk generasi yang akan datang. Masalah utama yang timbul pada wilayah aktivitas tambang adalah perubahan lingkungan. Perubahan kimiawi terutama berdampak terhadap air tanah dan air permukaan, berlanjut secara fisik perubahan morfologi dan topografi lahan. Lebih jauh lagi adalah perubahan iklim mikro yang disebabkan perubahan kecepatan angin, gangguan habitat biologi berupa flora dan fauna, serta penurunan produktivitas tanah karena menjadi tandus atau gundul. Mengacu kepada perubahan tersebut perlu dilakukan upaya reklamasi. Selain bertujuan untuk mencegah erosi atau mengurangi kecepatan aliran air limpasan, reklamasi dilakukan untuk menjaga lahan agar tidak labil...

Mine closure has become the world issue. It is proven by many international conference such as “Mine Closure 2010 (MC10)” held on November 23rd-26th 2010 in Vina del Mar, Chile, a country which lately became the world’s interest because of its succeed in rescueing 33 miners who trapped inside underground mine. This mine closure conference was the fifth conference held by The Australian Centre for Geomechanics and the Centre for Land Rehabilitation at the University of Western Australia and they plan to hold it in 2011 in Alberta, Canada. It was noted that there are 64 papers from 18 countries presented in the conference. One of mine closure paradigm discussed in the conference is Legacy-based Framework for Mine Closure which came from stakeholders’ interest especially towards social and environmental effect caused by mining projects. The social and environmental effect is legacy of mining companies towards surrounding people. This legacy will be left and felt by surr...

Sari Kebutuhan barang tambang mangan yang meningkat dengan kemajuan teknologi yang membutuhkan mineral mangan dalam jumlah besar harus disikapi dengan proses penambangannya yang baik. Salah satu proses yang harus dilalui dalam proses penambangan mineral atau energi termasuk mineral mangan adalah eksplorasi. Eksplorasi yang baik adalah bagian dari good mining practice untuk mencapai tingkat keyakinan dalam proses produksi pertambangan, sehingga pemegang IUP sudah mengetahui dengan tingkat keyakinan tinggi berapa cadangan mangan yang bisa ditambang di lokasi IUP. Lama dan besar per satuan waktu produksi dapat dihitung dengan memasukkan jumlah potensi mangan tersebut dengan sumber daya yang dimiliki perusahaan. Tahapan – tahapan dan metode eksplorasi mineral mangan adalah recognaisance, pemetaan geologi, test pit/trenching, metode geofisika, dan pemboran. Tahapan – tahapan ini merupakan suatu kesatuan utuh yang saling melengkapi. Setiap tahapan direncanakan berdasarkan evaluasi tahap...

Abstract A good mine company is company that not only profite orientation but how its responsibility in safety and health of employees and care about environment impact. CV Cahaya Bintang Timur Mineral as one of mine company in Indonesia is going to reach good minie production but  the best in safety. The design of the human body, with its hard work and environment, makes it difficult to stay fine. In case, some dangers spy on every our inattentiveness. The company will make some regulation for  watch out for hazards which might put us in danger. CV Cahaya Bintang Timur responsible to give education in safety, health, and environment to all employees. Keywords: safety, good mine production

Abstract Slope stability of mining is one of the factors that influence mineable reserve calculating and stripping ratio. This means that these factors will be significant in further economic evaluation. One factor that significantly influence slope stability of mining in wich the slope is excavated is discontinuity. The discontinuity refers to naturally occurring breaks in the rocks such as tectonic joints, faults, lithological boundaries, sheeting joints, bedding planes and bedding plane joints, cooling joints and metamorphic fabrics. The properties of discontinuity relative to stability include orientation, roughness, waviness, spacing, aperture, persistences, infilling and seepage. There are four general modes of slope failure caused discontinuity: plane failure, wedge failure, toppling failure and circular failure. The discontinuity data often occurs in three dimensions with a degree of natural scatter and in order to able to use the data in design, it necessary have...