The Szklary mine is a large mine in Szklary, ZÃÂ bkowice County in Poland, 340 km south-west of the capital, Warsaw. Szklary represents the largest nickel reserve in Poland having estimated reserves of 28.8 million tonnes of ore grading 0.73% nickel. The 28.8 million tonnes of ore contains 210,000 tonnes of nickel metal.