A Californian startup, Marathon Fusion, aims to produce gold through nuclear fusion by converting mercury-198 into gold-197 using neutron radiation from fusion reactors. Unlike particle accelerators like CERN's Large Hadron Collider—which produce negligible amounts of gold at enormous costs—Marathon Fusion proposes using a standard fusion reactor fuel mix (deuterium and tritium) to create the necessary neutron flux, theoretically enabling substantial gold production. Their estimates, derived from a fusion reactor's "digital twin," suggest a plant could yield several tons of gold annually per gigawatt of thermal power. However, the feasibility of this process remains untested, as no commercial fusion reactors exist, and the gold produced would initially be radioactive, requiring careful management. Significant scientific, technological, and economic challenges must be addressed before this ambitious concept can lead to a modern-day gold rush.