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Safe mine operations and optimal economical decision making in the context of lignite resources require an adequate level of knowledge about the spatial distribution of critical attributes in terms of geometry and quality in the deposit. Therefore, ore bodymodels are generated using different approaches in geostatistics, depending on the problem to be solved. In this article the analysis of geostatistical methods used for deposits modeling has been presented. Based on exploration data concerning caloric value Q, models of one exemplary lignite deposit has been made. Two models of deposit were prepared using two different methods: ordinary kriging (OK) and sequential Gaussian conditional simulation (SGSIM). Different models of the same deposit were analyzed and compared with source data using criterion of fidelity to statistical attributes like: mean value, variance, statistical distribution. Models, which have been created based on exploration data, were compared with in-situ data gained from survey activities in the exploitation process. As a result of comparison correlation factor and measures of deviations were computed: average relative error, absolute relative error. Models were compared with in situ data, considering statistical features and local variability as well. In conclusion, the study gives valuable information into the benefits of using certain geostatistical approaches for variable tasks and problems in the lignite deposits design process. For the assessment of average values of deposit parameters ordinary kriging provides appropriate effects. Geostatisical simulation (e.g. sequential Gaussian simulation - SGSIM) provides much more relevant information for tasks connected to probability (or risk) of defined threshold exceedences than ordinary kriging. Models made with simulation method are characterized by high fidelity of spatial distribution in comparison to source data.


Geisler J.,Mitteldeutsche Braunkohlengesellschaft mbH
World of Mining - Surface and Underground | Year: 2014

The continuation of lignite mining in Central Germany was highly controversial around the time of German reunification in 1989/1990. Nevertheless, stakeholders at MIBRAG and the Treuhandanstalt trust agency still succeeded in finding international investors. Today, the common goal of all parties and those affected - to maintain the regional economy and at the same time increase the quality of life for those living in the coal field - continues to bring stakeholders together from the areas of politics, administration, mining and mine remediation. Examples of successful resettlements, transparency in dealing with our neighbours, investment in technology as well as environmental and species protection projects are all contributing to improving the image of lignite mining in Central Germany. New forums for dialogue, such as groups aimed at establishing contact with local residents and neighbourhood days, are serving to build confidence and spread awareness of the possibilities and limits of industrial production. MIBRAG sees demographic change as a challenge. A robust political framework forms the basis of how we conduct our local communication activities and develop young talent within the company. For more than a decade now, school partnerships and project work in the field of vocational orientation have continued to help secure the next generation of workers. A new training centre was opened in 2013. Core tasks in the coming years will involve recruiting apprentices, rejuvenating our workforce and fostering the exchange of information between new arrivals and employees who have been with the company for many years. We will also need to focus on motivating employees who are aged between 55 and 65; between now and 2020 the proportion of employees in this age range will continue to increase steadily. We need new approaches to managing talent and succession so as to prepare our business leaders of the future for the tasks which lie ahead.


Benndorf J.,Technical University of Delft | Struzina M.,Mitteldeutsche Braunkohlengesellschaft mbH
International Journal of Mining, Reclamation and Environment | Year: 2014

The dewatering of subsurface unconsolidated rock strata is a critical prerequisite for many mining operations. The uncertainty in knowledge about the aquifer geometry is critical for both, the planning of directional dewatering drilling and the hydrological planning. This contribution focuses on investigating the influence of geological uncertainty on modern mining-related dewatering measures, namely horizontal directional dewatering wells. The traditional approach of drilling, planning and groundwater modelling on the basis of interpolated geological models is extended to integrate geological uncertainty. Using conditional simulation allows for more robust decisions in planning and subsequently increased efficiency. A case study in a large open pit operation demonstrates the benefit of using such methods. For a specified level of confidence, proposed methods provide a means of determining the number of samples required for the optimal placement of the filter section. The results also provide the means of quantifying uncertainty in predicting filter-well output. © 2013 © 2013 Taylor & Francis.


Ballmann S.,RWE AG | Lehner R.,Mitteldeutsche Braunkohlengesellschaft mbH | Scholze P.,Vattenfall | Lewa S.,Prufstelle fur Tagebaugerate im DEBRIV
World of Mining - Surface and Underground | Year: 2013

Geotechnical laboratory tests lay the foundation for performing stability examinations on opencast-mine slopes. The determined shear strength values directly affect the result of stability calculations and are therefore crucial to the reliable and adequate, i.e. safe and cost-efficient, dimensioning of opencast-mine rime slopes. Special laboratory examinations for great opencast mine depths as in the Rhenish mining area are not offered on the market. In addition, RWE Power considers it necessary to have the competencies and equipment required for these essential tasks available in-house and to be able to perform these tasks on its own responsibility and according to its own reproducibility and accuracy standards to ensure economic efficiency in view of the substantial time and effort required. Our aim is to combine all responsibilities for laboratory and stability examinations under one roof for this is the only approach enabling proper coordination between laboratory examination (implementation, underlying conditions, assessment) and stability examinations (calculation procedures, use of parameters, assessment) and an adequate dimensioning of the large opencast-mine slope systems in the Rhenish area without additional safety margins.For this reason, RWE Power continues to operate its own Ge-omechanical Test Laboratory, in which a wide range of special examinations for the opencast mines and their surrounding areas is conducted. To verify and prove the high quality of these examinations the Geomechanical Test Laboratory, as early as 2006, underwent an extensive and independent audit within the scope of an accreditation process. The accreditation of the Test Laboratory also safeguards that its results are independent of economic or other interests of RWE Power AG. The present article underlines how important reliable and trustworthy laboratory results are to RWE Power in order to guarantee the "geotechnical safety" of opencast mines and their surrounding areas as well as cost-efficient and smooth mining operations. With its opencast mines, RWE Power is therefore demonstrating the energy to lead in geotechnics with regard to slope depths, slope creation, and mass movement.


Herczik M.,Severoceske Doly a.s. | Baldermann G.,Mitteldeutsche Braunkohlengesellschaft mbH
World of Mining - Surface and Underground | Year: 2013

Crushing and screening stations are units technologically closed in themselves. An improvement of occupational safety, health and fire protection will always require complex approaches taking into account given operational specifics and technological process management. There is an increasing requirement to limit dust emissions, install dust suppression and extraction systems and make continuous technical/technological as well as organizational modifications particularly in terms of industrial hygiene and fire protection. As a result, coal dust emissions and deposits will be reduced to a minimum and conditions will be significantly improved for the protection of employees' health and an optimization of safety at work and fire protection.


Baille W.,Ruhr University Bochum | Sandner W.,Mitteldeutsche Braunkohlengesellschaft MbH | Sawade G.,University of Stuttgart | Schad H.,Reinsburgstrasse 111 B | Schanz T.,Ruhr University Bochum
Geotechnik | Year: 2012

This paper deals with experiments which were performed to determine the shear strength parameters of different varieties of Brown Coal (lignite) from central Germany. Object of investigation were the lignitic coal varieties with fragmentary structure (Yellow Coal and Brown Coal) of seam 23 in the Profen/Schwerzau mine and the compact coal of seam 1 in the Profen mine. The determined shear strength values were aimed at verifying the parameters used for stability analysis so far as well as for determining possible differences in shear strength between the Yellow Coal and Brown Coal varieties. An experimental program was realized including triaxial and in-situ shear tests. The sampling and the specimen preparation for laboratory testing required special measures due to the sensitive structure of the coal variety with fragmentary fabric. The shear strength of the variety Yellow Coal and Brown Coal was found to be nearly identical. However, the shear strength as determined from triaxial tests and in-situ shear tests differ from each other, which can be explained by the different structure of the material tested (small-fragmentary structure versus medium/large-fragmentary structure) at the one hand and by the different boundary conditions during the test. Copyright © 2012 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


Hofmann B.,Mitteldeutsche Braunkohlengesellschaft mbH
World of Mining - Surface and Underground | Year: 2012

Mitteldeutsche Braunkohlengesellschaft (MIBRAG) mbH from Germany continues to be involved in highly efficient and locally accepted lignite mining in the country. MIBRAG's operations are located in the area south of Leipzig, at the south-west border of the Leipzig Lowland, in the free state of Saxony and the state of Saxony-Anhalt. The Profen mine and the beneficiation plants of MIBRAG are situated in Saxony-Anhalt from an administrative point of view, while the United Schleenhain mine with all its three mining fields is located in Saxony. The minimum requirement for lignite mining and beneficiation in these federal states is the political acceptance of these activities. This effort also requires permits from the mining authorities and consent with the affected parties, people, and nature. All parties involved are aware that stable coal supplies are the prerequisite for stable power and heat supplies in the region and that agreement is always reached by way of compromise.


Benndorf J.,Technical University of Delft | Yueksel C.,Technical University of Delft | Shishvan M.S.,Technical University of Delft | Rosenberg H.,RWE AG | And 7 more authors.
Minerals | Year: 2015

This contribution presents an innovative and integrated framework for real-time-process reconciliation and optimization (RTRO) in large continuous open pit coal mines. RTRO-Coal is currently developed, validated, tested and implemented as part of a multi-national multi-partner European Union funded R&D project. The key concept is to promote a shift in paradigm from intermittent discontinuous to a continuous process monitoring and quality management system in large scale coal mining operations. The framework is based on a real-time feedback control loop linking online data acquired during extraction rapidly with a sequentially up-datable resource model. The up-to-date model is integrated with a real-time optimization of short-term sequencing and production control decisions. Improved decisions are expected to lead to increased resource-and process efficiency and support a sustainable extraction of natural resources. This contribution introduces to the framework, discusses main building blocks and illustrates the value added by the means of selected examples. © 2015 by the authors; licensee MDPI, Basel, Switzerland.


A system and method are disclosed, which can detect and process a position of at least one storage space device moving a bulk material. A first storage space device can have a gantry having two gantry legs, each of the two gantry legs supported on a linearly displaceable foot element. The system can include at least one first non-contact distance sensor, which is fitted on one of the two foot elements to measure a first relative distance between the one foot element and a first fixed reference point. A second non-contact distance sensor is fitted to the other of the two foot elements in order to measure a second relative distance between the other foot element and a second fixed reference point, and an evaluation unit is configured to determine rotation of the first storage space device about a central vertical axis and control the movement of the foot elements.

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