6 research outputs found
Recovery of Gold with AgNO3 Pretreatment by Cyanidation at Heap Leaching Cijiwa Gold Ore Processing
Get PDFThis research was undertaken to study the effect of adding silver nitrate (AgNO3) during leaching of gold ore for Au recovery. Its focus is to obtain the weight of Au in feed and concentrate, the effect of AgNO3 on Au recovery, theconcentration of AgNO3 that led to optimum recovery, and the weight of bullion and Au content in bullion. This research was conducted using quantitative descriptive method with experimental technique and the research steps include the following: 1) rock and treatment plant preparation, 2) tests with variable AgNO3 concentrations, 3) analysis feed and concentrate samples using atomic absorption spectroscopy (AAS), 4) measurement of concentrate density, 5) burning of activated carbon to get the bullion, and 6) weighing bullion and Au content. There was increase Au recovery from 12.57% to 36.15%. On addition of 0 to 4 gram of AgNO3, whereby highest recovery was obtained on the addition of 4 g of AgNO3 concentration to 150 kg of feed
ANALISIS PERBEDAAN KADAR ENDAPAN BIJIH NIKEL SAPROLIT ANTARA HASIL EKSPLORASI DENGAN REALISASI PENAMBANGAN PADA BLOK GC PULAU GEE KABUPATEN HALMAHERA TIMUR PROVINSI MALUKU UTAR
No full textPT. Aneka Tambang Tbk, unit Geomin merupakan bagian dari PT. ANTAM yang membidangi masalah Eksplorasi di daerah pulau Gee, yang kemudian penambangannya dilakukan oleh PT. Minerina Bhakti dilakukan dengan sistem penambangan terbuka. Tingkat validitas dari data eksplorasi akan terbukti setelah dilaksanakannya kegiatan penambangan, namun pada kenyataannya sering terjadi perbedaan antara data hasil ekplorasi dengan realisasi penambangan, maka penelitian ini akan menganalisa sebab-sebab terjadinya perbedaan kadar hasil ekplorasi dengan realisasi penambangan, serta faktor-faktor penyebab terjadinya perbedaan kadar tersebut. Adapun titik bor yang tertambang pada bulan Juni adalah 19 titik bor dengan kadar Ni eksplorasi rata-rata 2,20 % dan kadar penambangan 2,27 % sedangkan bulan Juli sebanyak 16 titik bor dengan kadar rata-rata Ni 2,23 % dan kadar rata-rata penambangan 2,20 %. Selisih kadar Ni antara eksplorasi dengan realisasi penambangan pada bulan Juni adalah 0,07 % dan pada bulan Juli adalah 0,04 %. Berdasarkan hasil penelitian, maka diketahui penyebab terjadinya perbedaan kadar Ni antara hasil eksplorasi dan produksi adalah: penyebaran deposit yang tidak merata, pengotoran dan kehilangan bijih saat penambangan, cara pengambilan sampel, air hujan, dan kesalahan manusia PT. Aneka Tambang Tbk, Geomin unit is part of PT. ANTAM is in charge of exploration issues in the Gee island area, which is then carried out by PT. Minerina Bhakti is carried out with an open mining system. The level of validity of exploration data will be proven after mining activities are carried out, but in reality there is often a difference between the exploration data and the realization of mining, so this study will analyze the causes of differences in exploration results with mining realization, as well as the causes of differences these levels. The drill points mined in June are 19 drill points with exploration Ni content of 2.20% and mining levels 2.27% while July is 16 drill points with an average Ni content of 2.23% and average mining levels 2.20%. Ni difference between exploration and mining realization in June was 0.07% and in July it was 0.04%. Based on the results of the study, it is known that the causes of differences in Ni content between the results of exploration and production are: distribution of uneven deposits, contamination and loss of ore during mining, sampling method, rainwater, and human error
Evaluasi Investasi Dan Sewa Alat Untuk Kegiatan Pengupasan Overburden Dan Penggalian Bijih Nikel Di Bukit Gc Pada Kmpra Pulau Gee Kec. Maba Kab. Halmahera Timur
Get PDFKMPRA adalah salah satu perusahaan yang bergerak dalam bidang pertambangan Nikel, dengan lokasi penambangan terletak di Pulau Gee, Kecamatan Maba, Kabupaten Halmahera Timur Propinsi Maluku Utara. Dalam memperlancar produksinya, KMPRA membuka beberapa lahan baru yang memiliki COG 2,5 %, salah satunya adalah bukit GC yang terletak diwilayah utara. Bukit GC yang akan ditambang seluas 19,17 Ha, cadangan bijih nikel yang akan digali sebesar 1.374.489 m3 dan Overburden (OB) yang akan dikupas 657.531 m3 dengan target produksi oleh perusahaan sebesar 250.000 ton/tahun dengan Mining Recovery 85 % dengan lama penambangan 5 tahun.Untuk pengadaan alat-alat mekanis (alat dororng Bulldozer dan alat gali Excavator). Untuk kegiatan pengupasan overburden dan penggalian ore bukit GC, akan dilakukan dengan menggunakan 2 metode yaitu antara investasi alat baru dan sewa alat. Pemilihan 2 metode ini berdasar pada nilai ekonomis alat apabila digunakan dalam kagiatan tersebut. Berdasarkan data cadangan,umur tambang,harga alat baru,depresiasi,pajak dan biaya operasional alat untuk investasi alat baru serta biaya sewa alat, besarnya biaya yang akan digunakan oleh alat dari masing-masing metode tersebut dapat dihitung dengan menggunakan analisis ekonomi Present Worth Cost (PWC) dan Future Worth Cost (FWC)
ANALISIS EFEKTIFITAS PEMBONGKARAN BLOK MARMER DARI BATUAN SUMBER DI PT. INDUSTRI MARMER INDONESIA TULUNGAGUNG KABUPATEN TULUNGAGUNG PROVINSI JAWA TIMUR
Get PDFPenelitian ini bertujuan untuk mengetahui efektifitas tentang proses penambangan marmer dalam hal ini ialah efektifitas pembongkaran blok marmer dari batuan sumber di PT. Industri Marmer Indonesia Tulungagung. Dalam proses penambangan marmer terdapat hambatan yang terjadi, hambatan yang dapat berupa hambatan internal dari alat atau hambatan eksternal dari faktor manusia. Hambatan yang timbul tersebut dapat mengakibatkan hasil produksi tidak maksimal. Penelitian ini dilakukan dengan studi literatur, dan observasi lapangan, data-data yang diambil yaitu data sekunder dan data primer diantaranya kondisi dan keadaan lokasi penambangan, target produksi perbulan, metode penambangan, dan efisiensi dari alat dan manusia. Dari data yang telah diambil dan dianalisis dapat diketahui efektifitas dari pembongkaran sebesar 86,55% dengan jumlah 39 blok atau 145m3, setelah dilakukan efisiensi dan perbaikan, efektifitas dari dari pembongkaran meningkat menjadi sebesar 96,49% dengan jumlah blok 43 blok atau 162 m3. Dari hasil tersebut dapat diketahui dari upaya peningkatan yang dilakukan tetap tidak dapat mencapai target yang ditentukan sebesar 300m3. Maka kesimpulanya untuk mencapai target yang telah di tentuka perusahaan harus melakukan penggandaan alat pembongkaran, karena dengan alat yang ada saat ini baru bisa mencapai 162 m3 meskipun sudah dilakukan efisiensi
The Application of Demonstrated Learning Methods to Increase Primary School Students' Science Learning Results
Get PDFThe paper aims to determine the difference in science learning outcomes of students who apply the demonstration method and the science learning outcomes of students who use conventional learning in class IV elementary school. The type of research that the author uses is experimental research. This research uses a group of research subjects from a certain population, then grouped randomly into two groups or classes, namely the experimental class and the control class. The experimental class was treated using the demonstration method and the control class used the conventional method, then both classes underwent the same post-test. The sampling technique used was non-probability sampling with proportional sampling. The same number of students and class average scores that are close to the same are class VA and class VB. After getting the sample class, the two classes were randomly drawn, then class VA was obtained as the experiment and class VB as the control. The results of this research can be seen from the results of the hypothesis test using the t-test which was carried out so that the value of t_count=0 and t_table= 2.02 was obtained. From the distributed table t, we get ttable = 2.02. So, it can be concluded that t_count > t_tabel, where 0 > 2.02, thus the working hypothesis H_1 is accepted, meaning there are significant differences in learning outcomes in the two samples. This research concluded that the science learning results of class IV students who used the demonstration learning method did not have a significant difference because the two sample classes got the same learning results, due to the limited time of the researcher who delivered the material to the experimental clas
Recovery of Gold with AgNO3 Pretreatment by Cyanidation at Heap Leaching Cijiwa Gold Ore Processing
No full textThis research was undertaken to study the effect of adding silver nitrate (AgNO3) during leaching of gold ore for Au recovery. Its focus is to obtain the weight of Au in feed and concentrate, the effect of AgNO3 on Au recovery, theconcentration of AgNO3 that led to optimum recovery, and the weight of bullion and Au content in bullion. This research was conducted using quantitative descriptive method with experimental technique and the research steps include the following: 1) rock and treatment plant preparation, 2) tests with variable AgNO3 concentrations, 3) analysis feed and concentrate samples using atomic absorption spectroscopy (AAS), 4) measurement of concentrate density, 5) burning of activated carbon to get the bullion, and 6) weighing bullion and Au content. There was increase Au recovery from 12.57% to 36.15%. On addition of 0 to 4 gram of AgNO3, whereby highest recovery was obtained on the addition of 4 g of AgNO3 concentration to 150 kg of feed
