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Energy raw materials that play a crucial role in the economic development of Poland are: crude oil, natural gas as well as lignite and hard coal. The history of mining of the aforementioned raw materials have a complex and long tradition. Historically, Poland was a pioneer and a European leader in crude oil mining which now has only marginal importance in domestic demand. Currently, we are also a witnesses of a decline of hard coal mining which was the basis of the country's energy security for many years. Poland ...