Mine-degraded soils represent one of the most challenging environments for ecosystem restoration, characterized by extreme pH conditions, heavy metal contamination, compaction, and depleted microbial communities. This study investigated the effectiveness of engineered microbial consortia for restoring soil health and promoting vegetation establishment in post-mining landscapes. A comprehensive field experiment was conducted over four years (2019-2023) at three distinct mining sites: Coal mining areas in Appalachian Mountains, USA, copper mining sites in Atacama Desert, Chile, and iron ore mining locations in Carajás, Brazil. Six treatment combinations were evaluated: control (no amendment), chemical amendments only, single microbial species inoculation, basic microbial consortium (5 species), enhanced microbial consortium (12 species), and integrated approach combining microbial consortium with organic amendments. The enhanced microbial consortium included nitrogen-fixing bacteria (Azotobacter chroococcum, Rhizobium leguminosarum), phosphate-solubilizing microorganisms (Bacillus megaterium, Pseudomonas fluorescens), heavy metal-tolerant species (Cupriavidus metallidurans, Ralstonia eutropha), and mycorrhizal fungi (Glomus intraradices, Gigaspora margarita). Soil chemical properties, microbial biomass, enzyme activities, and plant establishment success were monitored throughout the study period. Results demonstrated significant improvements in soil quality following microbial consortium application, with pH increasing from 3.2 to 6.4 in acidic mine soils and decreasing from 9.1 to 7.8 in alkaline conditions. Heavy metal bioavailability decreased by 45-67% through microbial immobilization and chelation processes. Soil organic carbon content increased from 0.3% to 2.1% in treated plots, while microbial biomass carbon rose from 12 mg kg⁻¹ to 186 mg kg⁻¹. Enhanced consortium treatments achieved 78% vegetation establishment success compared to 12% in control plots. Root colonization by mycorrhizal fungi reached 65% in inoculated treatments versus 8% in controls. Soil enzyme activities including dehydrogenase, phosphatase, and urease increased by 3-8 fold following microbial consortium application. Economic analysis revealed cost-effectiveness with benefit-cost ratios of 2.8-4.2 over 15-year projection periods. The study concludes that engineered microbial consortia provide a viable biotechnological approach for mine soil restoration, accelerating natural recovery processes and establishing self-sustaining ecosystems.