Giraffe Bio wins $6.4M to tailor molecules for copper mining

Biotech copper extraction is getting attention because the old answer to rising demand, opening another mine, works badly. Only about 0.3% of prospective mines ever make it to production, and each attempt is expensive and depends heavily on luck.

Meanwhile, the ore left in the ground keeps getting poorer and more complicated. Miners have to process more rock to get the same amount of metal. So a growing group of startups is asking a different question: can existing mines squeeze more out of what they already handle?

Most of those startups work on heap leaching, where microbes help dissolve copper out of crushed rock piled in huge heaps. Endolith has bred hardy microbes for the job, Ceibo is developing its own strains, and Transition Metal Solutions makes prebiotics that feed the bacteria already there. Giraffe Bio took another route entirely.

Giraffe Bio targets flotation, the step that handles roughly 80% of the world’s copper production. In flotation, crushed ore goes into a water bath with chemicals that make certain minerals cling to air bubbles and rise to the top, where operators skim them off. Everything else sinks.

The catch is that much of the chemistry used in flotation is decades old and fairly generic. The better a chemical grabs the copper mineral and ignores the rest, the more copper a mine recovers. Giraffe Bio designs its molecules to match the specific minerals in a given mine’s ore, so they bind tightly to copper and leave the waste behind. CEO and co-founder Alejandro Buffo Sempé says the company is very good at picking up only the copper.

The same platform also makes depressors. These are chemicals that latch onto unwanted material, such as arsenic, and drag it to the bottom of the bath, which leaves a cleaner copper concentrate on top.

Here’s the clever part. The company does use engineered microbes, but they stay in a bioreactor at the factory. The microbes produce the compounds, and only the finished chemical goes to the mine. Keeping bacteria alive in a harsh mining site is very hard, so this sidesteps the problem. The company also describes its approach as combining AI-assisted molecular design, cell-free biology (making molecules with biological machinery outside living cells) and testing on real ore samples.

Giraffe Bio says its reagents can help mines recover up to 5% more copper. That may sound small. In mining, it is not. Buffo Sempé called that kind of gain “really very material” and noted that most operators would be pleased with an extra point or two of recovery.

Think of a large mine that already runs huge volumes of ore through its flotation circuit every day. A few extra percent of copper from the same rock, with the same trucks, crushers and staff, is close to pure upside. It is also far less of a gamble than finding, approving and building a new pit.

The reagents are designed as drop-in products. They work alongside a mine’s existing flotation chemicals and don’t need new equipment or infrastructure, which lowers the barrier for a cautious industry to try them.

Orion Industrial Ventures led the round. Other investors include Twynam, Baruch Future Ventures, Air Capital and BHP Ventures, the venture arm of one of the world’s largest mining companies. SOSV backed the company earlier.

Giraffe Bio was founded in 2024. It was also picked as the first Latin American company in Breakthrough Energy’s Fellows Program, which gives founders funding, technical guidance and access to mentors as they move from the lab to market.

The startup is part of a wider shift. Big mining firms are putting money into biotech tools that might raise output. Rio Tinto, for example, has invested in Fieldstone Bio, which uses microorganisms to measure target minerals in soil samples so explorers can decide where to dig next.

You won’t see Giraffe Bio’s name on any product, and nothing changes overnight. But copper prices feed into the cost of electric cars, home wiring, solar panels and the cloud services you use every day. Any technology that adds supply from existing mines helps ease the squeeze that forecasters warn about.

There is also an environmental angle. Some traditional flotation chemicals are harmful, and Giraffe Bio says its biomolecules can replace the job those chemicals do. Getting more metal from ore that has already been mined also means less new land disturbed for the same amount of copper.

It is still early. The company has tested its technology with global mining companies on several copper ore types, but it has not yet shown results at full industrial scale.

The new money will pay for manufacturing scale-up, larger pilot programs, more lab and testing capacity, and a bigger technical and sales team. The company is now moving toward larger-scale pilots and industrial validation at working mines.

Copper is only the start. Buffo Sempé says the same platform could be tuned for other metals, with gold and silver named as possible targets.