In 2019 we discovered fungi that metabolize gold. There are already those who want to turn them into the key to space mining

The story started more than five years ago in Boddington, south of the Australian city of Perth. Over there, among killer animals and gold mines, a team of researchers from the Australian CSIRO discovered something really strange: that certain strains of the fungus Fusarium oxysporum Not only could they extract gold from their surroundings and integrate it into their structure, but by doing so they managed to spread faster than the rest.

It seemed like a curiosity, but in recent years the situation has begun to change.

But wait, why is this something so “weird”? Good question. After all, we know for a fact that fungi “play an essential role in the degradation and recycling of all types of organic material (like leaves or bark), but also in the cycle of certain metals such as aluminum, iron, manganese and calcium.” Why would it be different with gold?

Because, as Tsing Bohu, researcher in charge of the project, explained, “gold is so inactive (chemically speaking) that these types of interactions are unusual and surprising, I had to see it to believe it.” And he saw it.

In fact, it published in Nature Communications. It was the first solid evidence that fungi could play a relevant role in the gold cycle in the Earth’s crust.

The “mushroom” of the golden eggs. The mining industry quickly turned its attention to the investigation. Especially right there in Australia. The island continent is the world’s third largest gold producer, but the consensus among analysts was that without new deposits production was going to fall (a lot) in a short time. The direct consequence is that this has made marginal deposits profitable.

Initially, the industry thought that the CSIRO investigation could be used to locate these new deposits. As we explained years agoIn Australia it is relatively common to prospect in forests of the aucalyptus family or near termite areas because they have a close relationship with the precious metal. Why not test the soil for those strains of Fusarium oxysporum?

But there is one more possibility. As Eduardo Bazo explained to Eugenio Fernández in a very interesting interviewin recent years companies have appeared that work in what we could call “metabolic mining“That is, using organisms to extract gold.

“And why do they want that?”, you might ask. “Isn’t it easier to identify where the gold is and extract it with industrial methods?” Yes, here on Earth, yes. But these companies have their sights set a little further: on space mining.

For years we have talked about the existence of huge mineral deposits in the Solar System and, during almost the same period, we have fantasized about being able to exploit them. The problem is that, beyond current technological limitationss, to the danger of normal mining, is added the fact that we are talking about processing metal in space.

But what if we use ‘metabolic mining’? The idea of ​​sending modified strains of these fungi (or other types of microorganisms) that They will process the mineral for useverything would become simpler. I don’t know if it’s more viable, but it is simpler.

It is much less rare than it seems (we use this type of approach to countless products we use regularly), however taking it to the world of mining seems a little more complex for pure efficiency. However, that is ‘now’. Because there are already experiments in this sense generating platinum in microgravity conditions and ‘metabolic’ copper is moving a lot of money.

What’s more, while I write (and while the era of cheap materials is over) several research groups They are growing all kinds of microorganisms with the idea of ​​being able to grow gold sooner rather than later. They are getting it.

Image | Dominic Vanyi | Jaap Straydo

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