Rating a single mineral, silica Sio2, located in the province of Semnan., the city of Damghan has the operation license for sale. عیار according to the distribution type 91.5% ذخیره definitive 250,000 tons, according to the distribution Type , and, according to the report, exploration, stored definite 750000 tons, and contingency reserve 1640000 tons استخراج annuity allowed 10,000 tons, مساحت the range of 2 square kilometers حقوق state annual 6 in. to 420 in. 000 USD(هرتن642تومان) کلیه things legal and administrative operation carried out and the expert operation, as well, with a minimum tariff of Engineering have been hired. for more information call.