Research Article
Planning for Reliable Coal Quality Delivery Considering Geological Variability: A Case Study in Polish Lignite Mining
Table 2
Basic statistics of calorific value based on 68 boreholes of the operational exploration and of the both models.
| | Data from the exploratory holes | Model ordinary Kriging | Model-exemplifying simulation |
| Number of holes/number of blocks | 68 | 195 (30 30 m) | 195 (30 30 m) | The mean value | 8267 kJ/kg | 8274 kJ/kg | 8260 kJ/kg | The standard deviation | 521 kJ/kg | 316 kJ/kg | 485 kJ/kg | Coefficient of variation | 6,30% | 3,80% | 5,9% | The minimum value | 6137 kJ/kg | 7517 kJ/kg | 6225 kJ/kg | The maximum value | 9259 kJ/kg | 8759 kJ/kg | 9006 kJ/kg |
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