This is the first time I've seen the use of spent brewers yeast as the biomass for bioaccumulation. However, it falls short of addressing the economic feasibility of extracting the accumulated metals, an essential aspect for practical implementation.

The ability of fungi to absorb metals is well-documented, but the real-world application of fungi for purposes such as bioaccumulation and bioremediation is predominantly hindered by the economics, including high labor costs, expensive inputs, and slow processing times.

Hopefully in the future we can dump a bunch of used brewers yeast into a giant gold tailings pond and leech gold and other precious metals for cheap, but we're not there yet.