Complex sentence: Area of the mining district is about 180 km 2 which contains several copper-polymetallic, copper-porphyry and stratified sulphuric pyrite deposits and ore manifestations.
Split into simpler sentences: Area of the mining district is about 180 km 2. The district contains several copper-polymetallic, copper-porphyry and stratified sulphuric pyrite deposits and ore manifestations.