Development of complex-structure ore deposits by means of chamber systems under conditions of the Kryvyi Rih iron ore field Journal title: Восточно-Европейский журнал передовых технологий Authors: Serhii Pysmennyi, Dmytro Brovko, Natalya Shwager, Iryna Kasatkina, Dmitriy Paraniuk, Oleksandra Serd... Subject(s):