From Hedging to Decarbonizing: the Role of Extracted and Recycled Precious Metals in Sustainable Portfolio Construction

Precious metals have become a critical component of investment portfolios for both individual and institutional investors. A key question is whether integrating extracted and recycled precious metals into equity portfolios can simultaneously enhance financial performance and reduce carbon emissions. Using Minimum Variance Portfolio (MVP) model alongside life cycle assessment (LCA) data from peer-reviewed studies, mining industry sustainability reports, and research institutes to evaluate the carbon intensity of these metals over a 26-year period (1999–2024). The findings show that all four precious metals serve as effective financial diversifiers during market turmoil, while also mitigating portfolio carbon intensity over time. Extracted metals initially exhibit higher CO2 emissions than the S&P 500, but they reduce portfolio carbon intensity over time. Extracted gold emerges as the most effective short-term carbon diversifier (5.4 years), followed by extracted silver (6.22 years), whereas platinum and palladium require longer holding period (22 and 16 years, respectively). Nevertheless, all four recycled precious metals provide immediate and substantial emission reductions, with recycled gold offering the most significant carbon efficiency benefits. Furthermore, multi-extracted metal portfolio outperforms single-extracted metal allocations in terms of carbon efficiency. These results offer critical insights for climate-conscious investors seeking alignment with decarbonization and net-zero goals.