Geologist I. L. Rudnitsky - discoverer of the Orsko-Khalilovsky iron ore deposit, the Gaysky deposit of copper-pyrite ores in the Orenburg region - on geological surveys, in the library, at home, in the Palace of Culture in the city of Gaya during his celebration as a discoverer of minerals and honorary citizen of the city. Open-pit and underground mining of copper-pyrite ore in the area of the Gayskoye deposit. Production processes at the Orsk-Khalilovsky Metallurgical Combine. Cities: Novotroitsk, Gai, which appeared with the discovery of iron ore and copper ore deposits.