1060 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]. Closed-loop 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. Figure 2 – Hyperspectral Remote Sensing Applications in Mining Water Management 3. CURRENT CHALLENGES IN WATER MANAGEMENT FOR THE MINING INDUSTRY 3.1 Acid Mine Drainage: The Persistent Challenge Acid Mine Drainage (AMD) occurs when sulfide minerals are exposed to oxygen and water, producing sulfuric acid, and mobilizing heavy metals. The problem is particularly acute because of their impact in the long-term due to persistence. Modelling studies indicate AMD can persist for 30+ years without active intervention, with some sites showing contamination for over 100 years [6]. Complex geochemistry
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