This briefing note describes work by ICMM, the International Copper Association (ICA) and Circle Economy Consulting to begin the process to develop potential headline indicators and key performance indicators (KPIs) to measure circularity across the mining and metals industry. These indicators span different scales, from individual companies to entire value chains. These metrics are prototypes. They are designed to provide a starting point for discussion and now need to be tested and refined by mining and metals companies to ensure they capture the intended information.