Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Voivozi Coal Mine is an open-pit mining exploitation, one of the largest in Romania located in Pope ti, Bihor County with estimated coal reserves of 3.9 million tonnes. The legal entity managing the Voivozi mine is the Ploie ti National Coal Company which was set up in 1957.Open-pit mining, also known as open-cast mining and open-cut mining, refers to a method of extracting rock or minerals from the earth by their removal from an open pit or borrow.