“CALCULATION OF ECONOMIC EFFICIENCY OF USING VARIABLE FREQUENCY DRIVE IN PUMPING UNITS IN UNDERGROUND LEACHING TECHNOLOGY OF MINERAL RESOURCES”. Web of Discoveries: Journal of Analysis and Inventions 3, no. 3 (March 26, 2025): 73–78. Accessed January 14, 2026. https://webofjournals.com/index.php/3/article/view/3696.