scholarly journals Optimum Open Pit Design for Kenticha Tantalite Mine, Southern Ethiopia

2021 ◽  
Vol 13 (1) ◽  
pp. 147-163
Author(s):  
Weldegebrial Haile ◽  
Bheemalingeswara Konka
Keyword(s):  
Mine Drainage ◽  
Mine Waste ◽  
Open Pit ◽  
Open Pit Mining ◽  
Southern Ethiopia ◽  
Borehole Data ◽  
Road Design ◽  
Mineral Development ◽  
Report Data ◽  
Pit Design

The mining sector’s share in Ethiopia’s economy is gradually increasing. Among metallic mines, Legadembi for gold and Kenticha for tantalum are the main contributors. At Kenticha, the Ethiopian Mineral Development Share Company is producing tantalite concentrate of 40-60% grade by open pit mining. The mine area is comprised of the rocks of Neoproterozoic age, pegmatite, granite, serpentinite, and talc-chlorite schist. The ore-bearing pegmatite intruding the basement serpentinite, and talc schist rocks, is asymmetric, N-S trending, and locally affected by fractures and local faults. Mining, at present, is being done using conventional methods not by developing benches. An optimum open pit design is developed and its impact on the run of mine is evaluated based on the field data, technical mine report data, borehole data, tonnage data, grade data, and mine survey. The suggested design has taken into account the mine drainage, bench design, haul road design, and mine waste dump design. Also keeping in view the future mining and production requirements. The suggested open pit mine design can minimize the dilution and improve the ore recovery.

scholarly journals Managing and Reforesting Degraded Post-Mining Landscape in Indonesia: A Review

Land ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 658
Author(s):  
Pratiwi ◽  
Budi H. Narendra ◽  
Chairil A. Siregar ◽  
Maman Turjaman ◽  
Asep Hidayat ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Success Rate ◽  
Coal Mining ◽  
Best Management Practices ◽  
Mine Drainage ◽  
Forest Area ◽  
Tree Planting ◽  
Open Pit ◽  
Open Pit Mining ◽  
Acid Mine

Tropical forests are among the most diverse ecosystems in the world, completed by huge biodiversity. An expansion in natural resource extraction through open-pit mining activities leads to increasing land and tropical forest degradation. Proper science-based practices are needed as an effort to reclaim their function. This paper summarizes the existing practice of coal mining, covering the regulatory aspects and their reclamation obligations, the practices of coal mining from various sites with different land characteristics, and the reclamation efforts of the post-mining landscapes in Indonesia. The regulations issued accommodate the difference between mining land inside the forest area and outside the forest area, especially in the aspect of the permit authority and in evaluating the success rate of reclamation. In coal-mining practices, this paper describes starting from land clearing activities and followed by storing soil layers and overburden materials. In this step, proper handling of potentially acid-forming materials is crucial to prevent acid mine drainage. At the reclamation stage, this paper sequentially presents research results and the field applications in rearranging the overburden and soil materials, controlling acid mine drainage and erosion, and managing the drainage system, settling ponds, and pit lakes. Many efforts to reclaim post-coal-mining lands and their success rate have been reported and highlighted. Several success stories describe that post-coal-mining lands can be returned to forests that provide ecosystem services and goods. A set of science-based best management practices for post-coal-mine reforestation is needed to develop to promote the success of forest reclamation and restoration in post-coal-mining lands through the planting of high-value hardwood trees, increasing trees’ survival rates and growth, and accelerating the establishment of forest habitat through the application of proper tree planting technique. The monitoring and evaluation aspect is also crucial, as corrective action may be taken considering the different success rates for different site characteristics.

scholarly journals Potensi Pemanfaatan Tanaman Thypa sp dan Cyperus sp dalam Proses Remediasi Air Asam Tambang dengan Sistem Rawa Buatan

SoilREns ◽  
2018 ◽  
Vol 16 (1) ◽  
Author(s):  
Apong Sandrawati ◽  
Darmawan Darmawan ◽  
Dyah Tj. Suryaningtyas ◽  
Gunawan Djadjakirana
Keyword(s):  
Fine Roots ◽  
Mine Drainage ◽  
Low Ph ◽  
Open Pit ◽  
Open Pit Mining ◽  
High Solubility ◽  
Artificial Wetland ◽  
Wetland System ◽  
Eichornia Crassipes ◽  
Iron And Manganese

Acid mine drainage (AMD) is the main problem in open pit mining due to extremely low pH and high solubility of metals. Metal solubility can be reduced biochemically in an anaerobic condition. This research was aimed to design and test artificial wetland system constructed. The artificial wetland has been constructed, it contains with two organic wall, two growing pond, and one collecting pond, each component bounded by dike. Organic wall was placed next to growing pond that planted by Typha sp and Cyperus sp. Collecting pond was planted by Eichornia crassipes. Iron and Manganese were accumulated in the root of each plant. Cyperus sp has a fibril type while Typha sp has rhizome type. The fine roots such as root of Cyperus sp could accumulation Fe higher than a rhizome roots such as root of Typha sp. Productivity of biomass was 31,38 ton/ha for Eichornia crassipes, 17,11 ton/ha for Typha sp, and 16,67 ton/ha for Cyperus sp. Eichornia crassipes has a higher biomass than other plants, but the size of this plant become smaller, it because the lack of nutrient in collecting ponds. Cyperus sp seems more prospective, this plant has better of growth rate than other plants.

scholarly journals A Tunnel under an In-Pit Mine Waste Dump to Improve Environmental and Landscape Recovery of the Site

Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 566
Author(s):  
Rania Rebbah ◽  
Joana Duarte ◽  
Omar Djezairi ◽  
Mohamed Fredj ◽  
João Santos Baptista
Keyword(s):  
Raw Materials ◽  
Mine Waste ◽  
Mining Industry ◽  
Mining Area ◽  
Legal Aspects ◽  
Ore Deposits ◽  
Open Pit ◽  
Open Pit Mining ◽  
Environmental Recovery ◽  
Phosphate Deposit

By adopting the green mining concept, the mining industry seeks to respond to the current societal objective of supplying the mineral raw materials necessary for economic development while minimising the ecological footprint. To accomplish environmental recovery simultaneously with mineral exploitation, as well as to take advantage of mine waste, this study proposes a new solution that includes the construction of a tunnel to access the mining area. The concept, developed with topographical and geological data, was tested for the Bled El Hadba phosphate deposit. The extraction volumes were estimated by considering all the technical and legal aspects of the exploitation. The results showed that the best location for the tunnel is on the non-mineralised bottom of the mine and placed after ore removal. The tunnel is then progressively covered by mine tailings as it is extended. This concept is applicable to sub-horizontal ore deposits. We show that the solution is feasible and allows full site recovery at the end of the open-pit mining phase.

Underground Degradation of Lignite Coal Spoil Material by a Mixed Microbial Community under Acid Mine Drainage Conditions

2013 ◽  
Vol 825 ◽  
pp. 46-49 ◽  
Author(s):  
Sabine Willscher ◽  
Doreen Knippert ◽  
Heiko Ihling ◽  
Denise Kühn ◽  
Sophie Starke
Keyword(s):  
Microbial Community ◽  
Ground Water ◽  
Mine Drainage ◽  
Mining Area ◽  
Open Pit ◽  
Open Pit Mining ◽  
Oxic Zone ◽  
Mixed Microbial Community ◽  
Lignite Coal ◽  
Long Term Impact

In a field study, biogeochemical processes in a large lignite coal spoil area with moderate AMD generation were investigated. Underneath this area, large amounts of groundwater are impacted by degradation and transformation processes of coal remainders in the former open pit mining area. An investigation was performed to find out the sources for the ground and surface water contaminations of larger areas. Samples were taken from different places and different depths of the coal spoil area and were investigated for different metabolic groups of microorganisms. As a result, fungi are able to degrade humic matter in coal spoil heaps in a first step to oligomers. Other microorganisms do a further degradation of first intermediates in a commensalic community. Streptomycetes do a cleavage of lignocelluloses, strepto- and other actinomycetes also degrade cellobiose and xylose related parts of the humic coal spoil matter. The different members of the microbial community exist in different “floors” of the spoil area: fungi and most Actinomycetes prefer the oxic zone, whereas degraders of aromatic and heterocyclic compounds can also exist in the capillary and ground water zones; here more frequently Arthrobacter, Pseudomonas, Rhodococcus and Mycobacterium strains were detected. Ferric iron formed in biooxidation of pyrite seems to play an important role as a catalyst for oxic as well as anaerobic degradation of complex organic matter in the underground. A complex linkage between microbial Fe-, S-, C- and N-cycles was figured out on this site that induces a high and long-term impact on ground water contamination in this area.

scholarly journals MONITORING METAL POLLUTION LEVELS IN MINE WASTES AROUND A COAL MINE SITE USING GIS

2017 ◽  
Vol IV-4/W4 ◽  
pp. 335-338 ◽  
Author(s):  
D. Sanliyuksel Yucel ◽  
M. A. Yucel ◽  
B. Ileri
Keyword(s):  
Coal Mine ◽  
Metal Pollution ◽  
Mine Drainage ◽  
Mine Waste ◽  
Geographical Information ◽  
Open Pit ◽  
Mine Wastes ◽  
Mine Site ◽  
Pollution Levels ◽  
Nw Turkey

In this case study, metal pollution levels in mine wastes at a coal mine site in Etili coal mine (Can coal basin, NW Turkey) are evaluated using geographical information system (GIS) tools. Etili coal mine was operated since the 1980s as an open pit. Acid mine drainage is the main environmental problem around the coal mine. The main environmental contamination source is mine wastes stored around the mine site. Mine wastes were dumped over an extensive area along the riverbeds, and are now abandoned. Mine waste samples were homogenously taken at 10 locations within the sampling area of 102.33 ha. The paste pH and electrical conductivity values of mine wastes ranged from 2.87 to 4.17 and 432 to 2430 μS/cm, respectively. Maximum Al, Fe, Mn, Pb, Zn and Ni concentrations of wastes were measured as 109300, 70600, 309.86, 115.2, 38 and 5.3 mg/kg, respectively. The Al, Fe and Pb concentrations of mine wastes are higher than world surface rock average values. The geochemical analysis results from the study area were presented in the form of maps. The GIS based environmental database will serve as a reference study for our future work.

Coal mining-disturbed land reclamation laws

2020 ◽  
pp. 15-26
Author(s):  
T. V. Galanina ◽  
M. I. Baumgarten ◽  
T. G. Koroleva
Keyword(s):  
Large Scale ◽  
Land Reclamation ◽  
Mining Industry ◽  
Development Program ◽  
Soil Disturbance ◽  
Open Pit ◽  
Open Pit Mining ◽  
Disturbed Land ◽  
Critical Problems ◽  
Production Output

Large-scale mining disturbs wide areas of land. The development program for the mining industry, with an expected considerable increase in production output, aggravates the problem with even vaster territories exposed to the adverse anthropogenic impact. Recovery of mining-induced ecosystems in the mineral-extracting regions becomes the top priority objective. There are many restoration mechanisms, and they should be used in integration and be highly technologically intensive as the environmental impact is many-sided. This involves pollution of water, generation of much waste and soil disturbance which is the most typical of open pit mining. Scale disturbance of land, withdrawal of farming land, land pollution and littering are critical problems to the solved in the first place. One of the way outs is highquality reclamation. This article reviews the effective rules and regulations on reclamation. The mechanism is proposed for the legal control of disturbed land reclamation on a regional and federal level. Highly technologically intensive recovery of mining-induced landscape will be backed up by the natural environment restoration strategy proposed in the Disturbed Land Reclamation Concept.

Current state and perspectives in automation of the open pit mining operations

2019 ◽  
Vol 8 (30) ◽  
pp. 115-123
Author(s):  
A.A. Sobolev ◽  
◽  
G.V. Sekisov ◽  
A.Yu. Cheban ◽  
N.M. Litvinova ◽  
...  
Keyword(s):  
Open Pit ◽  
Open Pit Mining ◽  
Mining Operations ◽  
Current State
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