Research Article
Chemometric Study of Trace Elements in Hard Coals of the Upper Silesian Coal Basin, Poland
Table 1
Characteristics of hard coal resources in Poland in 2012 [
2].
| | No. of deposits | Geological resources [mln Mg] | Industrial | Balanced | Off balance |
| Total | 146 | 48,225 | 18,302 | 4,210 |
| of which resources of exploited deposits: | Operating plants | 51 | 19,130 | 6,507 | 1,178 |
| of which resources of off balance deposits: | Total | 52 | 25,139 | 11,173 | — | Deposits explored | 34 | 11,423 | 3,619 | — | Deposits preexplored | 18 | 13,716 | 7,553 | — |
| of which resources of abandoned deposits: | Total | 43 | 3,955 | 621 | — |
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