134 The adoption of circular economy principles has gained momentum, particularly since 2016, with ICMM reporting that over 40% of major mining companies have implemented some form of circular water management by 2024 [11]. This approach emphasizes water reuse and recycling (achieving up to 60-95% reuse rates in mineral processing operations) [4]. Closedloop systems (reducing freshwater consumption by 40-80%) [4] and integration with broader sustainability goals aligned with UN SDG 6 (Clean Water and Sanitation) [11]. Recent studies demonstrate that circular economy approaches can achieve up to 90% water reuse rates in mineral processing operations while simultaneously recovering valuable materials from waste streams, generating additional revenue of $2-15 million annually for large operations [4]. 2.3 Technological Innovations in Water Treatment 2.3.1 Advanced Treatment Technologies The past decade has seen significant advancement in treatment technologies specifically designed for mining applications, with treatment efficiency improvements of 20-50% compared to conventional systems [13]. Some of the most relevant and commonly used treatment methodologies are Membrane technologies with reverse osmosis and ultrafiltration achieving 95-99.5% contaminant removal [20]. Additionally electrochemical treatment using advanced oxidation processes for recalcitrant contaminants reach 85-99% removal efficiency [13]. As well as biological treatment that uses constructed wetlands and biofilms achieving 70-95% metal removal at 50-80% lower costs than conventional treatment [21]. And finally, hybrid systems which considers combination approaches optimizing multiple treatment mechanisms with overall efficiency improvements of 15-30% [13]. 2.3.1 Remote Sensing and Monitoring Hyperspectral remote sensing has emerged as a powerful tool for monitoring mining water impacts, with spatial resolution improving from 30m in 2010 to 5m in 2024, and spectral resolution increasing from 50 bands to over 200 bands [8]. Recent applications demonstrate the ability to detect acid mine drainage indicators and contamination plumes with 90-95% accuracy compared to ground-truth measurements [8]. Figure 2 shows the different reflectance signatures of different AMD water conditions.
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