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, [S. l.], v. 3, n. 3, p. 73–78, 2025. Disponível em: https://mail.webofjournals.com/index.php/3/article/view/3696. Acesso em: 26 apr. 2026.