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Article

Technical Aspects of Mining Rate Improvement in Steeply Inclined Coal Seams: A Case Study

Faculty of Mining and Geoengineering, AGH University of Science and Technology, 30-059 Kraków, Poland
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Resources 2020, 9(12), 138; https://doi.org/10.3390/resources9120138
Received: 27 September 2020 / Revised: 18 November 2020 / Accepted: 20 November 2020 / Published: 24 November 2020
(This article belongs to the Special Issue Mineral Resource Management: Assessment, Mining and Processing)
This paper presents our experience obtained when mining the thick and steeply-inclined Seam 510 in the Polish Kazimierz-Juliusz coal mine with the use of a unique mechanical face mining system. Seam 510, which is 15–20 m thick and inclined at angles of 40°–45°, was initially treated as uneconomical because effective mining systems were not available. However, to extract high-quality coal resources, a completely mechanized variant of the sublevel caving system was designed based on standard machines and equipment applied in coal mining. Extraction was conducted top-down at the levels of the particular mining sub-level drifts with roof caving. The faces in the extracted coal release areas were protected by a single pair of specially designed mechanized mining system sections. One of the basic problems revealed during extraction of subsequent mining panels, was the observed changeability of the resource mining rates. The extraction losses changed in the available resources from less than 10% to about 50%. This paper presents two typical courses of changes in the extractable resource mining rates. Similar rate changes occurred in both cases with continued mining of a single seam section. Our analysis enabled deposit loss estimations and production output planning under the sublevel caving systems applied in the extraction of seam deposits of similar structure. View Full-Text
Keywords: coal mining; thick and steep coal beds; sublevel caving; extraction effectiveness; deposit extraction rate coal mining; thick and steep coal beds; sublevel caving; extraction effectiveness; deposit extraction rate
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MDPI and ACS Style

Rak, Z.; Stasica, J.; Burtan, Z.; Chlebowski, D. Technical Aspects of Mining Rate Improvement in Steeply Inclined Coal Seams: A Case Study. Resources 2020, 9, 138. https://doi.org/10.3390/resources9120138

AMA Style

Rak Z, Stasica J, Burtan Z, Chlebowski D. Technical Aspects of Mining Rate Improvement in Steeply Inclined Coal Seams: A Case Study. Resources. 2020; 9(12):138. https://doi.org/10.3390/resources9120138

Chicago/Turabian Style

Rak, Zbigniew, Jerzy Stasica, Zbigniew Burtan, and Dariusz Chlebowski. 2020. "Technical Aspects of Mining Rate Improvement in Steeply Inclined Coal Seams: A Case Study" Resources 9, no. 12: 138. https://doi.org/10.3390/resources9120138

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