scholarly journals The use of indirect distributions of selective mining units for assessment of recoverable mineral resources designed for mine planning at Gold Fields' Tarkwa Mine, Ghana

2015 ◽  
Vol 115 (1) ◽  
pp. 51-57 ◽  
Author(s):  
W Assibey-Bonsu ◽  
J Searra ◽  
M Aboagye
Keyword(s):  
Mineral Resources ◽  
Mine Planning ◽  
Selective Mining

scholarly journals Incorporation of Geometallurgical Attributes and Geological Uncertainty into Long-Term Open-Pit Mine Planning

Minerals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 108 ◽  
Author(s):  
Nelson Morales ◽  
Sebastián Seguel ◽  
Alejandro Cáceres ◽  
Enrique Jélvez ◽  
Maximiliano Alarcón
Keyword(s):  
Production Scheduling ◽  
Programming Model ◽  
Mineral Resources ◽  
Mineral Deposit ◽  
Open Pit Mine ◽  
Mine Planning ◽  
Open Pit ◽  
Operational Parameters ◽  
Financial Outcomes

Long-term open-pit mine planning is a critical stage of a mining project that seeks to establish the best strategy for extracting mineral resources, based on the assumption of several economic, geological and operational parameters. Conventionally, during this process it is common to use deterministic resource models to estimate in situ ore grades and to assume average values for geometallurgical variables. These assumptions cause risks that may negatively impact on the planned production and finally on the project value. This paper addresses the long-term planning of an open-pit mine considering (i) the incorporation of geometallurgical models given by equiprobable scenarios that allow for the assessing of the spatial variability and the uncertainty of the mineral deposit, and (ii) the use of stochastic integer programming model for risk analysis in direct block scheduling, considering the scenarios simultaneously. The methodology comprises two stages: pit optimization to generate initial ultimate pit limit per scenario and then to define a single ultimate pit based on reliability, and stochastic life-of-mine production scheduling to define block extraction sequences within the reliability ultimate pit to maximize the expected discounted value and minimize the total cost of production objective deviations. To evaluate the effect of the geometallurgical information, both stages consider different optimization strategies that depend on the economic model to be used and the type of processing constraints established in the scheduling. The results show that geometallurgical data with their associated uncertainties can change the decisions regarding pit limits and production schedule and, consequently, to impact the financial outcomes.

scholarly journals Optimization of the Heap Leaching Process through Changes in Modes of Operation and Discrete Event Simulation

Minerals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 421 ◽  
Author(s):  
Manuel Saldaña ◽  
Norman Toro ◽  
Jonathan Castillo ◽  
Pía Hernández ◽  
Alessandro Navarra
Keyword(s):  
Discrete Event Simulation ◽  
High Performance ◽  
Discrete Event ◽  
Mineral Resources ◽  
Mineralogical Composition ◽  
Heap Leaching ◽  
Mine Planning ◽  
Modes Of Operation ◽  
Event Simulation ◽  
Productive Phase

The importance of mine planning is often underestimated. Nonetheless, it is essential in achieving high performance by identifying the potential value of mineral resources and providing an optimal, practical, and realistic strategy for extraction, which considers the greatest quantity of options, materials, and scenarios. Conventional mine planning is based on a mostly deterministic approach, ignoring part of the uncertainty presented in the input data, such as the mineralogical composition of the feed. This work develops a methodology to optimize the mineral recovery of the heap leaching phase by addressing the mineralogical variation of the feed, by alternating the mode of operation depending on the type of ore in the feed. The operational changes considered in the analysis include the leaching of oxide ores by adding only sulfuric acid (H2SO4) as reagent and adding chloride in the case of sulfide ores (secondary sulfides). The incorporation of uncertainty allows the creation of models that maximize the productivity, while confronting the geological uncertainty, as the extraction program progresses. The model seeks to increase the expected recovery from leaching, considering a set of equiprobable geological scenarios. The modeling and simulation of this productive phase is developed through a discrete event simulation (DES) framework. The results of the simulation indicate the potential to address the dynamics of feed variation through the implementation of alternating modes of operation.

scholarly journals Use of mine planning software for the evaluation of resources and reserves of a sedimentary nickel deposit

2013 ◽  
Vol 47 (4) ◽  
pp. 1980
Author(s):  
I. Kapageridis ◽  
A. Apostolikas ◽  
S. Pappas ◽  
I. Zevgolis
Keyword(s):  
Mineral Resources ◽  
Mine Planning ◽  
Reporting Standards ◽  
Mining Operations ◽  
Nickel Deposit ◽  
International Reporting ◽  
Planning Software ◽  
Geostatistical Estimation ◽  
Nickel Deposits ◽  
Mineral Reserves

The use of mine planning software in the evaluation of deposits and estimation of mineral resources and reserves has become widespread and is considered a prerequisite for the reporting of reserves according to international reporting standards and codes. The main principles of operation and application of these codes are transparency of reported material, the relevance of reported information (materiality) and the competence of people involved in producing the reports. The application of specialised mine planning software described in this paper currently takes place at operational mines of sedimentary nickel deposits in Central Evia, Greece. It involves all stages of processing of exploration data including entry, analysis, processing and modelling of data, geostatistical estimation of quantities and qualities of mineral resources and mineral reserves, and the design, optimisation and scheduling of mining operations.

scholarly journals Technologies for Decreasing Mining Losses

2013 ◽  
Vol 11 ◽  
pp. 41-47
Author(s):  
Ingo Valgma ◽  
Vivika Väizene ◽  
Margit Kolats ◽  
Martin Saarnak
Keyword(s):  
Material Flow ◽  
Oil Shale ◽  
Mineral Resources ◽  
Screening Process ◽  
Extraction And Separation ◽  
Selective Mining ◽  
Process Simulations ◽  
Final Yield

Abstract In case of stratified deposits like oil shale deposit in Estonia, mining losses depend on mining technologies. Current research focuses on extraction and separation possibilities of mineral resources. Selective mining, selective crushing and separation tests have been performed, showing possibilities of decreasing mining losses. Rock crushing and screening process simulations were used for optimizing rock fractions. In addition mine backfilling, fine separation, and optimized drilling and blasting have been analyzed. All tested methods show potential and depend on mineral usage. Usage in addition depends on the utilization technology. The questions like stability of the material flow and influences of the quality fluctuations to the final yield are raised.

scholarly journals Assessing the Impact of Geologic Contact Dilution in Ore/Waste Classification in the Gol-Gohar Iron Ore Mine, Southeastern Iran

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 336
Author(s):  
Iman Masoumi ◽  
Gholamreza Kamali ◽  
Omid Asghari ◽  
Xavier Emery
Keyword(s):  
Iron Ore ◽  
Mineral Resources ◽  
Mine Planning ◽  
Production Data ◽  
Geological Interpretation ◽  
Iron Ore Mine ◽  
Simulation Based ◽  
Geological Boundaries ◽  
The Impact

Since the Gol-Gohar iron ore mine (GGIOM), which is located in southeastern Iran, is currently one of the biggest iron mines in this region, increasing the accuracy of its mineral resources model has become a challenge for geologists, metallurgists and mining engineers. Given that an accurate classification of the mining blocks into ore or waste is highly significant in strategic mine planning, three approaches for simulating the iron grades were compared against the true grades obtained from production data. The comparison was done by calculating the ratio between the total number of blocks correctly classified as ore and waste and the total number of misclassified blocks, and it was conducted for each approach in three mined benches at the GGIOM. The results reveal that the grade simulation that ignores the geological boundaries and the grade simulation based on a deterministic geological interpretation are much less accurate than the hierarchical approach, which consists of simulating both the geological boundaries and the grades.

scholarly journals Seismic methods in mineral exploration and mine planning: A general overview of past and present case histories and a look into the future

Geophysics ◽  
2012 ◽  
Vol 77 (5) ◽  
pp. WC173-WC190 ◽  
Author(s):  
Alireza Malehmir ◽  
Raymond Durrheim ◽  
Gilles Bellefleur ◽  
Milovan Urosevic ◽  
Christopher Juhlin ◽  
...  
Keyword(s):  
Mineral Exploration ◽  
Mining Industry ◽  
Mineral Resources ◽  
Great Depth ◽  
Mine Planning ◽  
Mineral Deposits ◽  
Mining Areas ◽  
Seismic Methods ◽  
Wide Range ◽  
Borehole Seismic

Due to high metal prices and increased difficulties in finding shallower deposits, the exploration for and exploitation of mineral resources is expected to move to greater depths. Consequently, seismic methods will become a more important tool to help unravel structures hosting mineral deposits at great depth for mine planning and exploration. These methods also can be used with varying degrees of success to directly target mineral deposits at depth. We review important contributions that have been made in developing these techniques for the mining industry with focus on four main regions: Australia, Europe, Canada, and South Africa. A wide range of case studies are covered, including some that are published in the special issue accompanying this article, from surface to borehole seismic methods, as well as petrophysical data and seismic modeling of mineral deposits. At present, high-resolution 2D surveys mostly are performed in mining areas, but there is a general increasing trend in the use of 3D seismic methods, especially in mature mining camps.

Public Administration in the Field of Subsoil Use and Protection in Ukraine

2019 ◽  
pp. 169
Author(s):  
Nadiia Maksimentseva
Keyword(s):  
Public Administration ◽  
Phenomenological Study ◽  
Inductive Reasoning ◽  
Mineral Resources ◽  
Selling Price ◽  
Administrative Functions ◽  
The People ◽  
European Court ◽  
And Performance ◽  
Incoming Energy

Laws and regulations backing and governing public administration in subsoil use and protection in Ukraine is gradually gaining priority and importance given incoming energy security and resource self-sufficiency risks alerts for the State as one of the warrants for political and economic independence and guarantees for the people of Ukraine to enjoy and plenipotentiary implement its propitiatory rights set forth in the Constitution of Ukraine with regard to natural resources and benefits that constitute the genuine wealth of the nation. The article is written with the application of inductive reasoning and performance of various research methods, such as case studies, phenomenological study with some focus on nature and source of laws and administrative functions, grounded theory study; also a deep comparative analysis of domestic and overseas legal patterns is carried out. The article is devoted to the research of problems with regard to public administration in the field of subsoil use and protection in Ukraine. The author emphasizes that determination of public administration in the field of subsoil use and protection is a form of public managerial activities of public administration authorities (state authorities, local self-government bodies, self-governing public organizations with the respective competence). It is suggested that these activities are aimed at implementation of the policies in the field of geological exploration of mineral resources, mineral extraction, construction of underground and terrestrial facilities not related to the extraction of minerals, subsoil and environmental protection and they are based on the principles of interaction between subject and object of public administration, discretion, mutual responsibility, self-governance and decentralization when public services are provided. Also, the article presents many judicial practice of the European Court of Human Rights and Citizen, the Supreme Court in the field of public administration in the field of subsoil use and protection. In concluding notes amendments to Subsoil Code of Ukraine, methodology for calculating the initial selling price for the sale of special permit, selection procedures for open special permit tender bid winners and responsibility for subsoil use abandonment costs are suggested by the author.

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