Author:
Singh Om Prakash,Dhekne P. Y.,Pradhan Manoj
Abstract
Surface miner was introduced for coal extraction at Lakhanpur open cast project of Mahanadi Coalfields Limited in 1999 for the first time and owing to its success and benefits it offered like elimination of drilling and blasting, smooth and stable high wall, selective mining for quality control and uniform output fragment size (-100mm) etc. it was adopted in many open cast coal mines and now has become a disruptive mass production technology for coal mining in India. In terms of coal resources in the country, Odisha stands first with 88.104 BT resources but the coal seams in Odisha are characterized by its high ash content and interlaced dirt bands (10 cm to 1.5 m) often termed as rejects. For maintaining coal quality, these dirt bands predominantly of sandstone and shale are also cut by surface miners and are segregated at the time of loading and transported to reject dumps or overburden dumps. These dirt bands have a significant impact on the performance of surface miners and must be taken into account during their selection. The authors, based on the intensive field study undertaken at different opencast coal mines in Odisha highlighted the impact of in-seam dirt bands in coal seams on the performance indicators of surface miners which are normalized production rate, diesel and pick consumption for cutting 1000te of material in this paper. Pick consumption was found to vary linearly with the quantum of abrasive material cut. Empirical relations for estimating monthly normalized production, diesel consumption, and pick consumption of surface miners operating in coal seams with intermittent dirt bands with a coefficient of determination (R2) of 0.74, 0.84, and 0.73 respectively were also developed. The developed relations were validated with the field data and the % error was found to be within +20%. This study helps the coal mining companies in the selection of suitable surface miners for achieving targeted production and also for planning inventory of picks and diesel during its operation.
Publisher
Informatics Publishing Limited
Reference24 articles.
1. Ministry of Coal (GoI). Monthly Statistical Report, Ministry of Coal, March 2023 [Internet]. 2023 [cited 2023 Sep 21]. Available from: https://coal.gov.in/sites/ default/files/2023-05/srn-march-2023_0.pdf
2. Prakash A, Singh KB, Murthy VMSR, Kumar C, Kumaraswamidhas LA. Development of a handy methodology for the selection of surface miners in varied rock mass conditions for the mass production of coal and limestone. JMMF. 2016; 64(5–6):12–7.
3. Coal Inventory. Inventory of Coal Resources of India [Internet]. 2022 [cited 2022 Sep 21]. Available from: https://www.cmpdi.co.in/en/coal-inventory
4. Tiryaki B, Dikmen AC. Effects of rock properties on specific cutting energy in the linear cutting of sandstones by picks. Rock Mech Rock Eng. 2006; 39(2):89–120. https://doi.org/10.1007/s00603-005-0062-7
5. Ghose AK. New technology for surface mining in the 21st century-emerging role for surface miners. JMMF. 2008; 56(3):41–3.