The Polkowice-Sieroszowice mine is a large mine in the west of Poland near Polkowice and Sieroszowice, Polkowice County, 350 km south-west of the capital, Warsaw. Polkowice-Sieroszowice represents one of the largest copper and silver reserve in Poland having estimated reserves of 387 million tonnes of ore grading 2.65% copper and 54 g/tonnes silver. The annual ore production is around 11 million tonnes from which 292,000 tonnes of copper and 594 tonnes of silver are extracted.

• http://en.wikipedia.org/wiki/Polkowice-Sieroszowice mine