Helmut Mischo

Helmut Mischo
Technische Universität Bergakademie Freiberg · Institut für Bergbau und Spezialtiefbau

Univ. Prof. Dr.-Ing. Pr.Eng.

About

243
Publications
74,751
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263
Citations
Additional affiliations
September 2011 - present
Technische Universität Bergakademie Freiberg
Position
  • Professor (Full)

Publications

Publications (243)
Article
Full-text available
Despite their significance in numerous applications, many critical minerals and metals are still considered minor. Since most of them are not found alone in mineral deposits, their co- or by-production depends on the production of base metals and other major commodities. In many cases, the concentration of the minor metals is low enough not to be c...
Article
CO2-enhanced shale gas recovery is a promising technology for promoting shale gas production and ideally for CO2 geological sequestration through sorption. Despite this, research studies to date have solely been performed at pressures and temperatures substantially lower than those that actually occur in shale formations. The thrust of this work is...
Article
Full-text available
As resource extraction moves deeper underground, backfill mining has received a lot of attention from the industry as a very promising mining method that can provide a safe workplace for workers. However, the safe and efficient transport of fill slurry through pipelines still needs more exploration, especially in the bend section. In order to inves...
Conference Paper
Full-text available
Among the thirty-five declared critical raw materials (CRM) in the United States, there is no sustainable domestic production for the fourteen of them, while for some others domestic supply does not meet the national demand. Numerous potential critical raw material projects are in advanced exploration stages. However, the price uncertainties for ma...
Article
Full-text available
Adsorbed methane significantly affects shale gas reservoir estimates and shale gas transport in shale formations. Hence, a practical model for accurately representing methane adsorption behavior at high-pressure and high-temperature in shale is imperative. In this study, a reliable mathematical framework that estimates the absolute adsorption direc...
Article
Full-text available
The study of pressure loss along pipelines during slurry transportation has become a core research concern. However, the simulation research on non-Newtonian flows in mining backfill operations is limited. In this study, a validated Herschel-Bulkley model is deployed to simulate and quantify the pressure evolution and flow characteristics of backfi...
Article
Full-text available
Mining is known to cause high ecological and social impacts. Thus, it has a paramount role in terms of supporting sustainable development, especially in developing or emerging economies. How can sustainability-oriented business model innovations redefine the raw materials sector and improve the sustainability performance?
Article
Full-text available
Fly ash (FA) is a kind of harmful by-product in thermal power generation plants, and finding a way to enhance the utility of fly ash has been widely discussed among civil engineering and mining sectors. To investigate the possible optimal ratios of replacing usually used bind agent namely Portland cement (PC) with fly ash, this paper designed diffe...
Conference Paper
Mining of several commodities such as iron, copper and gold, to name a few, has been there for thousands of years, and has helped humankind to develop and industrialise. However, if it were not for the unique properties of specific strategic metals like nickel, lithium, cobalt, indium, germanium, and the group of rare carth elements, the exploitati...
Article
Shale formations are typically buried deeper and process higher temperature and pressure than conventional reservoirs, resulting in a significant proportion of shale gas being adsorbed under the supercritical state. Because the mechanism of supercritical adsorption is substantially different from that of conventional subcritical adsorption, there a...
Thesis
Full-text available
Abstract In recent times, there were various campaigns against environmental degradation and a need to save the earth. This led to a call for cleaner source of energy to eliminate carbon emission into the environment. Gradually, rechargeable household equipment became common in the society and not so long the introduction of an electric powered ve...
Article
Despite the fact that societal frustration for many rare earth element (REE) potential mining projects has been witnessed as early as from the exploration phase, the implementation of Social License to Operate (SLO) as an evaluation parameter is not considered in the preliminary project assessment stages. Project owners fail to identify and underst...
Book
Full-text available
This book is a detailed report related to the excursion of students and faculty members from the Institute of Mining and Special Civil Engineering of TU Bergakademie Freiberg in Greece during September 2019. A 14-day trip was organised and several mining sites and industry related facilities were visited all over Greece. Each chapter in this book d...
Preprint
Full-text available
Our solar system is full of critical raw materials. Asteroids such as "Ryugu" or i.e. "Davida" have mineral resources worth about $27 quintillion (Statista, 2019). Their exploitation could mean a "sustainable" solution for the humankind and the end of dependence from these resources. But, who would be the owner of these valuable resources? United S...
Article
Shale gas has attracted increasing attention as a potential alternative gas in recent years. Because a large fraction of gas in shale formation is in an adsorbed state, knowledge of the supercritical methane adsorption behavior on shales is fundamental for gas-in-place predictions and optimum gas recovery. A practical model with rigorous physical s...
Conference Paper
Full-text available
Our solar system is full of critical raw materials. Asteroids such as "Ryugu" or i.e. "Davida" have mineral resources worth about $27 quintillion (Statista, 2019). Their exploitation could mean a "sustainable" solution for the humankind and the end of dependence from these resources. But, who would be the owner of these valuable resources? United S...
Conference Paper
Full-text available
Training and lifelong learning of mining industry professionals over the value chain of critical raw materials has been recognised worldwide as a challenge for the development of a strong raw materials mining sector. Nevertheless, the number of available mining sites for continuous practical education is limited, while also the specifications for p...
Conference Paper
The paste filling mining method is a filling technique with many advantages and maybe is the perfect way to solve the most challenging issue that we have to face when we exploiting the resources under the deep ground. However, the paste is affected by many factors (the surrounding rock temperature, the surrounding rock pressure, backfill sequence,...
Article
Adsorbed methane is an important component of shale gas. Methane desorption, commonly ignored, can affect gas production. Gaining a better understanding of methane sorption in shale is important for evaluating gas reserve and predicting gas production. This paper presents the results from a study of the methane adsorption and desorption of four sha...
Article
Full-text available
Our solar system is full of critical raw materials. Asteroids such as "Ryugu" or i.e. "Davida" have mineral resources worth about $27 quintillion (Statista, 2019). Their exploitation could mean a "sustainable" solution for the humankind and the end of dependence from these resources. But, who would be the owner of these valuable resources? United S...
Article
Das Forschungs- und Lehrbergwerk der TU Bergakademie Freiberg ist einer von sechs Schauplätzen der 4. Sächsischen Landesausstellung 2020
Conference Paper
Full-text available
The present study aims to investigate possibilities for improving the recovery of pyrochlore ((Na, Ca)₂Nb₂O₆) and monazite ((Ce, La, Th, Sm)PO4) as by-products from a phosphate mine with current niobium (Nb) production from geometallurgical perspectives. With this purpose, process mineralogy of Nb- and REE-bearing minerals together with operating p...
Article
Full-text available
In an extremely competitive mining industry, onsite experience is a big advantage. Mining education at the universities is mostly focused on theoretical studies without a possibility of practical training in mining sites. Hence, experimental mines suitable for practical education are needed to provide a platform for systematic research and educatio...
Conference Paper
The paste backfill method is one of the world most used techniques for backfilling nowadays. Among the many advantages of paste backfilling is early rock support ability. Another advantage is that there is no need to pump out excess water from the stopes. This paper discusses the application of the paste backfill method in different mining methods...
Presentation
Full-text available
‘Safety first’ – all miners know the importance of this slogan. Personal protective equipment, automated or remote-controlled machinery and safety instructions all help to avoid accidents underground. However, there are still many dangerous mining situations where the risk to human life is too high. Modern technologies can help to overcome this obs...
Conference Paper
Full-text available
‘Safety first’ – all miners know the importance of this slogan. Personal protective equipment, automated or remote-controlled machinery and safety instructions all help to avoid accidents underground. However, there are still many dangerous mining situations where the risk to human life is too high. Modern technologies can help to overcome this obs...
Book
Kalkulationsleitfaden für Planer und Kalkulaturen von Bauleistungen im untertägigen Raum
Conference Paper
Full-text available
In an extremely competitive mining industry, onsite experience is a big advantage. Mining education at the universities is mostly focused on theoretical studies without a possibility of practical training in mining sites. Hence, experimental mines suitable for practical education are needed to provide a platform for systematic research and educatio...
Conference Paper
Full-text available
Mine operators have explored underground autonomy for the past 50 years to improve safety and productivity in mines. The main goal is to remove the human operator from the hazard, which improves safety and, in many cases, productivity. Automation and autonomy are simpler if the equipment follows a pattern of operation that requires few decisions. S...
Article
Full-text available
Mining education in Germany has undergone significant changes and development over the past decade. On the one hand, this is due to the changing framework conditions and requirements of industry, science and society. On the other hand, this process form, also known as the Sorbonne Declaration and Bologna Process. All in all, this has led to an incr...
Article
In the context of the constant expansion of the Research and Education Mine of the Technical University (TU) Bergakademie Freiberg/ Germany, and the structural change of the Central German mining industry, new adjustments need to be made on the local mine rescue organization. This article examines the structure of the mine rescue organization at TU...
Article
The increasing complexity of mining operations results in increasing requirements for the mining engineerging education. The demand of broad skills sets in constantly equal sized programs is the reason to blend the addressed skills in teaching and learning activities. A promising approch represents the experiential learning in an authentic envirmen...
Article
Full-text available
Mining used to be a business primarily focused on the technical aspects of getting valuable ore out of the ground and extracting the minerals efficiently. Without denying the importance of these skills, a narrow focus on technical issues is no longer enough to guarantee success when it comes to exploiting rare earth element (REE) deposits. Molycorp...
Article
Full-text available
Within the framework of trade deals and infrastructure investments, China also wants to build a "belt of scientific cooperation" with countries and international organisations involved in the Belt and Road Initiative. This could create an opportunity for involvement of several European countries that have so far treated China's initiative with skep...
Article
Full-text available
Использование подземного пространства в крепких горных породах, после отработки шахт часто вызывают дискуссии об альтернативном использовании оставшейся туннельной системы. Решение заполнить их каменными блоками, бетоном и грунтовыми водами не всегда оптимально, так как эта экологическая работа требует финансовых ресурсов. Альтернативой закрытию яв...
Presentation
Construction of a large scale test facility for flow analysis of vertical transport of water and coarse material and executing of tests as part of the European research project “Blue Mining”
Conference Paper
The use of modern information and communication technologies (ICT) is an essential driving force for innovations in most social and economic fields. Use of ICT in the mining and special civil engineering sector is also increasing, from ever-improving automation to the vision of fully automated operating mines or tunnel building sites in the context...
Preprint
Full-text available
Fluorspar is one of the most important industrial minerals. It has a wide range of applications, for example it is used in the steel and aluminum industry, and is also the raw material to produce hydrofluoric acid, Teflon or Gore-Tex. There are only a few major fluorspar mines worldwide, with China being the most important fluorspar producer (U.S....
Poster
Full-text available
The interdisciplinary Junior Research Group ARIDuA is conducting research on the topic “autonomous robots and the Internet of Things (IoT) in underground mining”. Mining 4.0 is currently highly topical and the project primarily aims to reduce risk to human life as well as operating costs in underground mines. For this purpose, five junior researche...
Presentation
Full-text available
Fluorspar is one of the most important industrial minerals. It has a wide range of applications, for example it is used in the steel and aluminum industry, and is also the raw material to produce hydrofluoric acid, Teflon or Gore-Tex. There are only a few major fluorspar mines worldwide, with China being the most important fluorspar producer (U.S....
Conference Paper
Full-text available
Mining used to be a business primarily focused on the technical aspects of getting valuable ore out of the ground and extracting the minerals efficiently. Without denying the importance of these skills, a narrow focus on technical issues is no longer enough to guarantee success when it comes to exploiting rare earth element (REE) deposits. Molycorp...
Presentation
Full-text available
Planning and construction of a large scale test facility for flow analysis of vertical transport of water and coarse material as part of the European research project “Blue Mining”
Preprint
Full-text available
The global mining industry is facing increasing challenges in terms of geological, technological and social aspects. Potential exploi-tation of deposits shows a tendency to increasing depth with complex ores and decreasing grades. A promising approach to deal with these constrains is by applying alternative extraction methods like (bio-)hydrometall...
Conference Paper
Vertical material transport is one of the major challenges for the successful implementation of deep sea mining projects. The EU research project „Blue Mining” is focusing on sustainable solutions for deep sea mining operations, with one major goal being the advancement of Vertical Transport Systems (VTS). To investigate flow effects under realisti...
Article
Full-text available
Fluorspar is one of the most important industrial minerals. It has a wide range of applications, for example it is used in the steel and aluminum industry, and is also the raw material to produce hydrofluoric acid, Teflon or Gore-Tex. There are only a few major fluorspar mines worldwide, with China being the most important fluorspar producer (U.S....
Presentation
Aufbau eines Strömungsversuchsstandes und Durchführung von Versuchen zur Untersuchung von auftretenden Effekten bei der vertikalen Förderung von Feststoff-Wasser- Gemischen in einem Großversuchsstand über 136 m Höhe im Rahmen des europäischen Forschungsprojektes „Blue Mining“
Conference Paper
Current mine control stations are either single-position systems with high engineering effort or all-in-a-box solutions with low integration possibilities of third-party devices. Above all, both approaches are cost-intensive and not feasible for small companies. This paper shall be an inspiration of how to enhance the productivity and monitoring of...
Conference Paper
Mit dem Ziel, vertikale Transportsysteme für den Tiefseebergbau weiterzuentwickeln, wurden im Rahmen des europäischen Forschungsprojektes „Blue Mining“ in zwei Fallstudien verschiedene kontinuierliche Strömungsförderprozesse betrachtet. Anhand dieser Untersuchungen wurden Rahmenbedingungen für einen Versuchsstand und die darin durchzuführenden Vers...