Област Перник (Pernik Province) borders Serbia and belongs mostly to the Dinaric mountains, which are partly composed of limestone. There are both Jurassic and Triassic limestones which are karstified. Around the city is a basin with coal deposits, at the border there are gold and silver ores found. The city has an interesting Mining Museum about the local resources, which are an important economic basement of the major manufacturing centre. There is the "Stomana" steel complex, production of mining and industrial heavy machinery, building materials, and textiles.