There are a few species of fungi that are capable of accumulating gold from soil or water in their natural environment. For example, the Filamentous Fungus Aspergillus niger has been studied for its ability to accumulate gold in its fungal cells. However, the amount of recoverable gold from these mushrooms is very low and the technology to extract gold from these mushrooms does not yet exist. As a result, gold mining from mushrooms is not a viable technology at present.
