Calculated in absolute terms as typical UCB-5307 Biological Activity annual values. Workforce productivity was
Calculated in absolute terms as average annual values. Workforce productivity was calculated because the ratio involving the typical annual coal production towards the average annual number of workers. The fatal injury rate was calculated per 1 million tons of coal created.Sustainability 2021, 13,4 ofThe values of the integrated coal quality index were calculated working with the process described in [23], which things in such parameters as ash, sulfur, and water contents also as the calorific value of coal. 2.three. Quantitative Assessment of the Complexity of Geological Situations Quantitative assessment on the complexity of geological conditions was performed according to the following geological parameters: seam thickness variability, qualitative traits, enclosing rock thickness, hydrogeological conditions (water inflow), and methane content [24]. The mines had been ranked by every single criterion on a scale ranging from 1 to 4. The lowest score represents straightforward geological conditions, plus the highest score represents really complicated geological situations. The scores had been then summed up, creating a ranking in the mines by the complexity of their geological conditions. The qualitative characteristics on the coal seams at each mine had been assessed by the company’s geologists using the support of a simplified algorithm: depending on the total combination of traits, the geological situations of each and every web-site have been PK 11195 Description classified as simple, moderately hard, complicated, or incredibly complicated. To assess the weight of every criterion determining the complexity of geological situations, a survey was carried out among the company’s personnel (26 people today), who were asked to assign a weight to every single criterion on a 10-point scale. The greater the weight, the additional significant this criterion is within the assessment. To evaluate the connection between geological conditions and sustainability, regression analysis was performed using Chaddock’s scale to assess the strength of relationship. 2.four. Supplies Due to the fact desk analysis is the important technique made use of within the study, we relied on official reports issued by the Vinacomin corporation as well as on publicly out there analysis information and information and facts around the topic. three. Results Table 1 shows the production sustainability indicators that were applied for additional analysis.Table 1. Production sustainability indicators at coal mines. Coal Mine Vang Danh Mao Khe Trang Bach Nam Mau Ha Lam Non Gai Mong Duong Khe Cham Khe Cham three Khe Tam Nga Hai Thong Nhat Nui Beo Production V 2873 1690 2669 2026 2361 1710 1442 1654 1468 1919 1480 1812 525 Jc 2.19 1.23 1.68 1.79 1.40 1.32 1.64 two.02 1.47 1.34 1.40 2.34 1.75 Economic P 762.0 604.six 1004.8 632.9 1387.7 794.1 671.1 620.four 781.7 838.1 645.9 800.six 392.1 Social Ac 0.26 1.48 0.56 0.74 0.21 1.17 1.04 0.76 1.53 0.39 1.01 0.83 1.43 Environmental Wd 1729.17 6323.83 4065.20 1853.78 1703.31 3815.14 3918.17 2918.16 879.88 5691.22 785.00 1987.11 1890.Sources: calculated by the authors determined by [11,12,249].In Table 1, V would be the average annual production volume, 106 kg, Jc could be the integrated coal high-quality index, P is the typical annual workforce productivity, 103 kg /person, Ac is theSustainability 2021, 13,5 ofaverage annual quantity of fatal injuries at operate, number/109 kg, and Wd is definitely the typical annual mine water discharge, 103 m3 . Criteria for assessing geological conditions are shown in Table two.Table two. Criteria for ranking coal mines by the complexity of geological conditions.Criterion Seam thickness variability, Qualitative characteristics (mo.