Juniper Publishers-Mining Science Technology

  Insights in Mining Science & Technology Abstract Complex work string dynamics are often observed when one is investigating the limit of Extended Reach Drilling (ERD), yet the underlying physical causes of anomalous problems are often not fully understood and is thus a topic of ongoing research interest. Theoretical models capturing tubular dynamics have been previously proposed to analyze force transfer in work strings, yet there is significant confusion regarding these models because their published versions are not entirely consistent and, in many cases, do not meet engineering requirement. Further confusion is introduced through variations in pin-pointing locations where axial compression in the work strings should be checked for mechanical integrity. A simple and yet rigorous mathematical model is essential for adequate prediction of axial compression profiles in work strings for ERD. This article presents a simplified tubular mechanics model for describing a...

  Insights in Mining Science & Technology Opinion Turkey is a country rich diversity of underground resources. Textronic and complex geological structure of Turkey allows the availability of a wide variety of mineral deposits. Today, approximately 90 types of mines are produced in the world. In Turkey, production is made of approximately 60 types of mines. Turkey, in 132 countries across the world, as the total value of mineral production in the 2nd ranks, in terms of the diversity of minerals is ranked 10th. Turkey is a rich country in terms of particularly industrial raw materials, some metallic minerals such as lignite, and geothermal sources of energy. 2.5% of world reserves of industrial raw materials, 1% of coal reserves, 0.8% of the geothermal potential, and 0.4% of the metallic mineral reserves are in Turkey. First among which Turkey is rich in minerals, are boron minerals with 74% of world reserves. However, except for a few reserves on a global scale mine...

  Insights in Mining Science & Technology Abstract An investigation was carried out for the demineralization of a low-rank coal containing high ash (37.74%) and sulphur (8.65%) content to clean it for industrial utilization. The raw coal was evaluated by proximate analysis, total sulphur and Gross Calorific Value (GCV). Run-of-mine coal as received was stage crushed and ground under controlled conditions to fair liberation size. The gravity concentration technology using diagonal deck concentrating table was employed to produce clean coal. A number of gravity separation tests were carried out by varying different parameters i.e. feed size, feed rate, wash water flow rate and deck inclination angle. The final de-mineralized clean coal obtained at optimum conditions contained 13.04% ash and 2.61% sulphur and found suitable for many industrial applications. Keywords: Lignite coal; Ash; Sulphur; Gravity Separation; Clean coal Introduction C...

  Insights in Mining Science & Technology Abstract The proximity principle is one of the main obligations in European regulations regarding waste management. However, this principle is not really implemented because it is not well defined in the law. Proximity is also linked to the new consensual concept of the circular economy, which highlights the local scale. The objective of this text is to understand the implementation of the proximity principle in the concept of the circular economy depending on waste management channels. The methodology is based on an analysis of the urban metabolism of three French cities and in-person interviews with stakeholders of waste management. The result of this research shows that the implementation of proximity is quite complex and affected by the principle of “variable geometry” depending on the types of waste. Some are managed at the local scale, such as putrescible and fermentable waste, bulky refuse, and final waste. Others, h...

  Insights in Mining Science & Technology Abstract The attention of most scholars and stakeholders is far drawn from the devastation of the environmental consequences caused by dredging related activities, which has necessitated sand filling and pilling including skewed national government policies, which has resulted to fundamental concern to halt species extinction, a situation which ecologist are not at ease with. Emphasis has been focused on alterations in the chemistry of the environment. They are worried with the numerous vanished creatures and saddened, often angered by their extinction. Man has directly or indirectly been the cause of the extinction, including the issues of depletion and degradation impact on the environment, thereby, leading to restrictions in the size, density, and distribution of organisms that threaten the biodiversity, resilience, or provision of ecosystem services. As soon as the functionally significant components of an ecosystem are...