Giraffe Bio targets copper shortfall with mine-specific biomolecules

Demand for copper is set to surge as data centers multiply and economies electrify, and copper supplies could fall 25% short of demand by 2040. Opening new mines is costly and unreliable — only about 0.3% of prospective mines ever become productive — so a wave of critical-minerals startups is instead trying to extract more copper from mines that already exist, mostly using microbes in heap-leaching processes. Endolith, Ceibo, and Transition Metal Solutions are among the companies pursuing that approach.

Giraffe Bio is taking a different route: engineering mineral-specific chemicals, rather than microbes applied directly to ore, that the company says can help mines recover up to 5% more copper. “That amount ‘is really very material,’” said Alejandro Buffo Sempé, the startup’s co-founder and CEO, in an interview with TechCrunch, noting that most approaches in the field are happy with an additional 1% to 2%.

To commercialize the technology, Giraffe Bio has raised a $6.4 million seed round led by Orion Industrial Ventures, with participation from BHP Ventures, Twynam, Air Capital, and Baruch Future Ventures, TechCrunch reported exclusively.

Rather than dousing ore with bacteria thought to aid copper extraction, Giraffe Bio grows engineered microbes in a bioreactor to produce bespoke compounds, which are then added into a mine’s existing process. “We can leverage all of the biological machinery without having to deal with keeping alive a microbe, which is very complicated in [mining] environments,” Buffo Sempé said.

The startup is starting with copper but says its platform can be adapted to other minerals, including gold and silver. Its compounds are used in flotation, the process in which chemicals cause minerals to float or sink in a water bath so operators can skim off the ones they want; the more tightly a chemical binds to the target mineral, the more of it can be recovered. Giraffe Bio is also developing “depressors” — chemicals that bind unwanted compounds like arsenic and sink them out of the mix — using the same biotech platform. Buffo Sempé said the approach can also replace flotation chemicals that are often harmful to the environment.

Why it matters

If Giraffe Bio’s compounds work at scale, they could let miners squeeze meaningfully more copper from existing operations rather than betting on new mines with a roughly 0.3% success rate — a hedge against a looming shortfall as AI data centers and electrification drive up demand.