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	—