https://www.vedomosti.ru/library/news/2006/04/28/odobreno-predlozhenie-o-ponizhenii-kojefficienta-dlya-vyrabotannyh-mestorozhdenij?utm_source=telegram&utm_campaign=share&utm_medium=social&utm_content=odobreno-predlozhenie-o-ponizhenii-kojefficienta-dlya-vyrabotannyh-mestorozhdenij