Kochkar gold mine "Nadezhda" and "Ekaterina" mines. Director of the Ural-Zoloto trust G. Titov at the mine. Technological operations of gold mining from ore and arsenic from arsenous pyrite. Buildings and workshops of the Voskresensky and Yekaterinsky plants. Workers at a mine in Yakutia (Aldan): in a quarry, transporting trolleys with ore; a worker pours sand from a basket, nuggets of gold.