The riches lie buried around 1,900 metres beneath the surface near the towns of Zielona Góra and Nowa Sól, and, if extracted could create 8,600 jobs and bring in an estimated PLN 1 billion a year to the state budget for decades to come.
PM flies in to visit injured and offer support to grieving families of those killed in horrific blast as Polish officials send outpouring of messages offering condolences and sympathy.
Sunday will be a day of national mourning in Poland after a Thursday methane explosion took the lives of 13 miners, including 12 Poles, at a mine in Karvina, Czech Republic, the Polish President's Office announced on Friday.
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