scholarly journals A Test of Two Methods for Waste Rock Drainage Quality Prediction: Aqua Regia Extraction and Single-addition Net-acid Generation Test Leachate Analysis

Author(s):  
Teemu Karlsson ◽  
Lena Alakangas ◽  
Päivi Kauppila ◽  
Marja Liisa Räisänen

AbstractThe mobility of contaminants from mine waste can be assessed using different extraction methods. Aqua regia (AR) extraction is the most commonly used method in Finland. Another method is the analysis of leachate from net acid generation (NAG) tests, which is primarily designed for acid production potential assessment. We investigated the performance of single-addition NAG test leachate analysis and AR extraction in drainage quality prediction, using waste rock and drainage water samples from several Finnish waste rock sites. Our objective was to improve interpretation of the AR and single-addition NAG test leachate analysis results in drainage quality prediction. The AR extraction effectively reflected elements that occurred in elevated concentrations in drainage water, though it over-predicted Al, As, Cd, Co, Cu, and Ni in some circumneutral drainages, and Cr in general. The single-addition NAG test leachate analysis also performed well in assessing the mobility of contaminants including Al and Cr at acid mine drainage sites. As the contaminants tend to precipitate in neutral NAG test solution, the usability of the method in neutral mine drainage cases should be further investigated. Furthermore, the conclusions presented in this study are limited to waste rock samples collected from the surface of piles; future work will examine waste rock history, dump cores, drainage quality changes, etc. in more detail.

1997 ◽  
Vol 36 (4) ◽  
pp. 241-250 ◽  
Author(s):  
Anis Farah ◽  
Nuri Hmidi ◽  
Ray Moskalyk ◽  
L. M. Amaratunga ◽  
A.S. Tombalakian

2007 ◽  
Vol 20-21 ◽  
pp. 291-294
Author(s):  
Roger B. Herbert ◽  
Linda Höckert ◽  
Mattias von Brömssen ◽  
Helen Friis ◽  
Gunnar Jacks

Column experiments investigated the stabilization of waste rock from Ljusnarsberg mine in Kopparberg, Sweden. In order to inhibit the generation of acidic leachate from the waste rock, biosludge and a Ca carbonate – rich residue from the paper industry were mixed with the sulfidic mine waste. The results of the column experiments indicate that the stabilization of the waste rock with the reactive amendments succeeded in maintaining a near – neutral pH in the waste rock leachate, compared to a pH 3 leachate from untreated waste rock. Copper and Zn concentrations in leachate from the untreated waste exceeded 100 mg/L, while these metals were detected at concentrations less than 0.1 and 1 mg/L, respectively, in the leachate from the treated wastes. This study indicates that the stabilization of acid – generating waste rock with biosludge and Ca carbonate residues is effective in preventing the generation of acid mine drainage; the treatment is expected to continue until the reactive amendments are exhausted.


2016 ◽  
Vol 160 ◽  
pp. 44-54 ◽  
Author(s):  
Asif Qureshi ◽  
Christian Maurice ◽  
Björn Öhlander

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Latipa Henim Siregar ◽  
Zulkifli Nasution ◽  
Fatimah Fatimah

Acid mine drainage is one of the significant negative impacts of  mining activities that can result  in environmental degradation. Waste rock is  mine waste that is found in large quantities and can produce acid mine drainage (AMD). This study aims to identify  waste rock which has  the potential to generate acidity (PAF) and do not generate acidity (NAF) in the Barani and Ramba Joring pits and the application of the encapsulation model in  tailings dams. The research method with the encapsulation model is a simple method designed in tailings dams to encapsulate the PAF with the NAF. Rock characterization and geochemical analysis will result in the rock being classified  as  PAF and NAF in both wells . The data used for this study are drilling data (cutting) data that include rock lithology and chemical quality (NAPP and NAG) data. The results identified that the PAF was dominant relative to the  NAF  both wells  and the waste rock in the Barani pit was at a  higher risk of producing acidity than the Ramba Joring pit. Measurements of oxygen diffusion and surface water quality indicated that encapsulation of waste rock in the tailings dam may  prevent the formation of acidic mine drainage


2020 ◽  
Vol 11 (2) ◽  
pp. 55
Author(s):  
Deddy Erfandi

<p><strong>Abstrak. </strong>Salah satu pemanfaatan lahan yang memiliki dampak negative terhadap kualitas lahan adalah kegiatan penambangan. Dengan ekploitasi lahan yang intensif menyebabkan permukaan lahan (lansekap) menjadi tidak beraturan. Limbah sisa hasil tambang yang berada dipermukaan lahan seperti batuan sisa bahan tambang (<em>overburden</em>), sisa bahan tambang yang berbentuk pasir (<em>tailing</em>) dan air asam tambang serta limbah batuan yang mengandung logam berat sering menimbulkan kualitas lahan menjadi <em>stress</em>. Bahan sisa limbah hasil tambang memiliki kandungan bahan organik dan kelembaban tanah yang sangat rendah, tanah mudah padat. Lapisan tanah atas pada lahan bekas tambang sangat heterogen dan memiliki berat isi tinggi, bersifat toksik dan hara makro menjadi tidak tersedia bagi tanaman sehingga tanaman tidak tumbuh dan berproduksi serta memiliki populasi mikroba tanah rendah. Pengelolaan lansekap pada lahan bekas tambang tidak terlepas dari tindakan konservasi tanah, karena selain memperbaiki tanah untuk media tumbuh tanaman, juga mengurangi dampak negative terhadap erosi dan aliran permukaan. Salah satu pendekatan dalam pengelolaan lansekap adalah meningkatkan kualitas tanah yang ramah lingkungan dan berkelanjutan. Pencegahan degradasi lahan dan membangun sumber bahan organik <em>in-situ</em>, melalui rotasi tanaman, sistim pengolahan tanah, penggunaan mulsa tanaman, tanaman penutup tanah dan pertanaman berlereng. Pemanfaatan sumberdaya lokal menjadi penting dalam rangka meningkatkan kualitas lahan bekas tambang. Namun hal terpenting bahwa pembenah tanah harus potential memperbaiki sifat fisik, kimia dan mikrobiologi tanah, serta bahan pembenah tanah atau ameliorant merupakan sumberdaya lokal.  </p><p><em><strong>Abstract. </strong>One use of land that has a negative impact on the quality of land is mining. With the intensive exploitation of land which causes the surface of the land (landscape) becomes irregular. Residual waste that is surface mined land as mine waste rock material (overburden), residual minerals in the form of sand (tailings) and acid mine drainage and waste rock containing heavy metals often cause the quality of land to become stressed. Waste material mined residual organic matter and soil moisture is very low, easy to soil solid. A layer of topsoil on mined lands is very heterogeneous and have a high bulk density, toxic and macro nutrients unavailable to plants so that the plants do not grow and produce, and have low soil microbial populations. Landscape management on mined land can not be separated from soil conservation measures, because in addition to improve the soil for plant growth media, also reduces the negative impact on erosion and runoff. One approach in the management of the landscape is improving soil quality that are environmentally friendly and sustainable. Prevention of land degradation and build a sources of organic material in-situ, through crop rotation, tillage systems, crop mulching, cover crops and crop cycle. Utilization of local resources to be important in order to improve the quality of mined lands. But the most important thing, that soil ameliorant should be potential improve to soil physical, chemical and biological , as well as ameliorant material are a local resource.</em></p>


Author(s):  
Colleen Harper ◽  
Carling Ruth Walsh ◽  
Carrie Fong ◽  
Paul Gammon ◽  
Richard T Amos

Mine waste-rock piles can release low quality drainage that is harmful to the surrounding environment. Many studies have investigated recently placed waste rock, but fewer have examined geochemical processes within, and downgradient of, old waste rock, even though these processes may be expected to persist for many decades. The Ore Chimney property was the site of gold exploration activities that produced a small waste-rock pile; it was abandoned in 1934. Elevated concentrations of Zn are restricted to within 50 m of the waste rock, and pH remains neutral across the site. Water and sediment analyses and geochemical modeling indicate that several processes are involved in pH buffering and contaminant control. Water samples taken at the edge of the waste rock were not acidic, indicating that mechanisms within the waste rock, including carbonate buffering and preferential oxidation of sphalerite over pyrite, are preventing Acid Mine Drainage (AMD). Natural attenuation mechanisms are operating within wetlands at Ore Chimney with the most likely controls for Zn transport in ground and surface water being carbonate mineral precipitation, co-precipitation with Fe and Mn oxides and oxyhydroxide minerals and Al sulphate minerals, and adsorption onto calcite and organic matter. This investigation shows that, after long time frames, natural attenuation mechanisms may act to effectively immobilize metal contaminants.


2014 ◽  
Vol 955-959 ◽  
pp. 1179-1183 ◽  
Author(s):  
Hajizadeh Namaghi Hadi ◽  
Ming Kun Luo ◽  
Sheng Li

Some waste rock piles create some problems such as acid mine drainage (AMD), leaching of heavy metals, and slope stability concerns. These problems are related to the flow of water through the rock pile. Understanding the physical and hydrological properties of the waste rock piles is important for flow and solute transport modeling. To study physical properties and unsaturated flow in rock pile, some soil samples were collected from surface of the large coal waste rock pile and tested for some common geotechnical parameters in the laboratory. The results showed that materials are so heterogeneous and highly supporting segregation and natural gravity sorting of waste rock materials from top to toe. Numerical simulation was performed to investigate the unsaturated flow conditions in the pile. The results obtained showed that pile is unable to fully saturate and drain during the simulated period. It was also found that high evaporation and also coarse grain nature of waste rock materials results holding few amounts of water in the system.


Author(s):  
Bissé Poaty ◽  
Benoît Plante ◽  
Bruno Bussière ◽  
Mostafa Benzaazoua ◽  
Martin Thériault

Sign in / Sign up

Export Citation Format

Share Document