`Goroubso-Madan was granted two concessions for 30-year exploitation of the Petrovitza and Krushev Dol deposits`, Subi Kichukov, Deputy Director of the company, announced. The annual fees for the concessions will depend on the quantity of ore extracted. `The monthly amount of ore extracted in mine near the town of Madan varies between 22 000 and 24 000 tons, which is considerably more than in the time when Goroubso was liquidated`, engineer Kichukov commented. According to him additional problems occur as a result of the crisis of prices of lead and zinc concentrates at the London Metal Exchange.