Method of Air Temperature Forecast in Mechanized Longwall Workings in the Conditions of Vietnamese Mines

In the most recent years, the Vietnam National Coal - Mineral Industries Holding CorporationLimited (VINACOMIN) has been dynamically developing mechanization technologies in undergroundcoal mines. The climatic conditions of Vietnam, as well as increasing the depth of the coal seams and theproduction capacity, contribute to an air temperature increasing in mining excavations. The articlepresents statistical equations enabling air temperature forecasting at the outlet of mechanized longwallworkings. The results of numerical calculations, obtained from the solutions of the adopted mathematicaldescriptions, were compared with the measurement results and the statistical significance of the obtaineddeviations was determined. The performed analysis allowed to assess the practical usefulness of theadopted model for the air temperature forecasting in the workings of mechanized underground mines inVietnam. The presented method can be used as a tool for mining services in the fight against the climatethreat in underground excavations.

Determining the working status of the production organization structure in the mechanized longwall when the negative impact factor has appeared

For the purpose of ensuring sustainable development, one of the important factors is to increase labor productivity and minimize the number of workers directly working in the mine. In the context of increasing requirements for underground coal mining, the number of workers tends to decline due to shifting to other types of economy. Therefore, the mechanization investment in coal mining is the inevitable destination, which guarantees the long - term strategic development of the coal mining industry. Although the mechanized mining has obtained several achievements, the annual coal mining output is still not high, specifically reaching 73.8%; 51.3%; 61.4% according to the plan respectively for the years of 2013, 2014 and 2015. A total of mechanized lines has been invested and applied in Vietnam National Coal - Mineral Industries Holding Corporation Limited, but there are only six lines in operation until at this time. For five recent years, when the mining industry has accumulated a lot of experience in using mechanization technology, it is found that the potential factors causing production interruption have resulted in the effectiveness of these longwalls not achieved as expected. Summary of advantages, difficulties, and unsuccessful implementation of mechanization technology in the condition of Quang Ninh mine area has shown a big gap in production organization that should be specifically studying. In this study, the author wants to build a basic background in determining the impact of potential factors conscious of the longwall mechanized.

Emerging Technologies for Harnessing the Fourth Industrial Revolution in the Energy and Mineral Industries

The Fourth Industrial Revolution provides new ways in which technology can become embedded within societies and even the human body [...]

Coal pricing mechanism of some countries in the world and lessons learned for Vietnam national Coal – Mineral industries holding corporation limited

As one of the two largest coal production and trading units in Vietnam, Vietnam National Coal - Mineral Industries Holding Corporation Limited (Vinacomin) is still operating both under the planning mechanism and the market mechanism. Additionally, in recent years, the group's coal price is also being built under these mechanisms. In the context of increasingly deep integration, fluctuating coal price and market, the competition of imported coal is getting more and more fierce, while coal mining conditions are increasingly difficult, the coal production and trading still have many shortcomings, so it is necessary to have a coal price determination mechanism accordance with the actual conditions of the Vietnamese coal market. Therefore, in order to determine the coal price scientifically and in association with practice, the reference to the coal pricing mechanism in some countries around the world to draw lessons for Vinacomin plays an important role. The content of this article mentions the coal pricing mechanism in some countries with a large amount of coal mining and consumption such as China, Australia, Russia, Indonesia,... thereby giving a comprehensive view of the coal price management, operation and construction mechanism of some coal markets in the world and as a reference basis for Vinacomin.

The impact of factors to profitability of some coal mining enterprises after vinacomin restructure project

The article uses Dupont analysis to determine the factors affecting profitability (ROE) of Vietnam coal mining enterprises and the regression method to examine the impact of production capacity of short-term assets, production capacity of long-term assets, production capacity of costs and capital structure on the profitability of firms. The article uses financial data collected from 19 coal mining companies of Vietnam National Coal-Mineral Industries Holding Corporation during the period of 2015 - 2018. The results show that production capacity of short-term assets, production capacity of long-term assets, production capacity of costs and capital structure positively impact profitability. The paper suggests 2 ways to improve profitability: firstly, borrowing to invest in technology will help coal mining enterprises improve their profitability; secondly, improving production processes appropriately to take full advantage of existing equipment capacity, thereby increasing profitability.