Abstract
The efficient use of water is critical for mines to ensure operational and environmental sustainability. This is particularly true in water scarce regions, and in areas where climate change has stressed water resources. Tracking water usage for sustainability reporting is required of mining companies, yet translating this data into actionable improvement remains a challenge. Often, water accounting data is reported using frameworks like the ICMM water accounting guidelines. However, this data often remains unexplored and underutilized once reported. Disclosures that do exist, do not account for mine characteristics like climate and commodity, that may influence mine water usage. To address this, we developed a database of publicly reported water usage data organized using ICMM water usage metrics reported on an asset basis. The database incorporates mines characteristics (e.g., mass of ore processed, mining method, climate, etc.) to offer a more granular means for comparison. Initial analysis revealed variability across most metrics when considering all operations. However, when assessed by specific mine characteristics, clearer trends emerged.
The database, along with understanding of site water balances, and reporting standards, is being used to develop a methodology to identify and prioritize opportunities to improve water efficiency on site. This method convenes key operational personnel from various departments—such as environmental, tailings, and mine operations—along with water and load balance modelers, in a workshop format. Here, they collaboratively pinpoint potential water-saving measures. These opportunities are then quantified and prioritized using a defined impact metric and a marginal abatement curve. This methodology not only facilitates the execution of prioritized water efficiency opportunities, but also enhances the ability to monitor and report on the progress of the initiatives annually. The process can be summarized in annual sustainability reporting leading to increased transparency with stakeholders.