The paper presents laboratory and pilot flotation tests of the R-66 reagent on samples of mixed copper ore from the Konyrat deposit. The medium regulator reagent was supplied to the main flotation. Laboratory tests of the technology of flotation concentration on ore with a copper content of 0. 31 % in a closed cycle in the optimal mode: R-66 - 100 g/t. https://parlorcityfurniturers.shop/product-category/desk-parts/