New resource-saving technologies for gold recovery from rebellious and hard-to-process material of clayey deposits and mining waste

It is proposed to make leaching piles by layering of crushed fractions by size grades from the bottom layer upward at certain orientation of the pile relative cardinal points and with spraying under waterproof and solution-impermeable light transmissive film. The combination gravity-electrochemical processing technology is proposed for gold extraction from dredge and sluice tailings, and the complete processing line is designed for all-year-round operation, including low-temperature conditions, based on pretreatment of polycomponent chlorine leaching solutions by electrochemical and photochemical synthesis. The magnetic flocculation add-on device is developed for fitting sluices and meant to reduce fine gold loss. The paper presents new engineering solutions that enable higher efficiency and intensity of gold extraction from clayey materials and mining waste, as well as integrated use of natural resources.