CO2 removal
We believe that to stabilize our climate we need to make big, bold moves and leverage the existing footprints of large-scale industrial operations.
Big & bold
We are developing strategic partnerships with the companies that handle billions of tonnes of waste every year – the global producers of critical minerals and industrial materials.
The lighter gigatonne
Our pathway has gigatonne-scale potential, with an ultra-light footprint – because we operate within existing industrial sites.
Industrial Mineralization
From underground
to rock star
We have proven our technology with ultramafic rock. Rich in magnesium, ultramafic rock naturally reacts with CO₂ in a process known as carbon mineralization, capturing and locking away CO₂ safely and permanently. But, like most geological processes, mineralization is slow. That’s why our breakthrough technology gives ultramafic rocks some superpowers to increase both the speed and the capacity for carbon removal.
Arca Head Scientist Dr. Greg Dipple explains more
Serpentinite is a common form of ultramafic rock that mineralizes atmospheric CO2. Photo: Dave Zeko
Turning waste
into value
It’s not just ultramafic rocks that can capture CO₂. Industrial waste such as steel slag contains calcium and magnesium that have the potential to react with CO₂ to form new carbonate minerals, locking CO₂ away permanently. Arca’s technologies harness this potential, transforming an industrial waste stream into an industrial-scale climate solution.
Deployment
Deploying rock-solid carbon removal
In 2025, Arca completed the world’s first and only carbon removal project using mine waste at an active mine operation. The technologies deployed during this highly successful 18-month demonstration project resulted in a 10x to 20x increase in mineralization rate above the baseline. We proved that Arca has the skills to partner seamlessly with heavy industry. This demonstration also contributed to Arca becoming a finalist in the globally prestigious XPRIZE Carbon Removal competition.
Rovers from Copperstone are customized with Arca's Smart Churning technologies
Technology
All-natural,
just way faster
Our technology accelerates the natural process of carbon mineralization, repurposing alkaline industrial waste materials for positive climate impact.
Arca was built on the foundation of more than 20 years of academic research, dozens of field trials and collaborations with more than 30 mining companies around the world.
Footprint
In the footsteps of giants
The modern industrial economy has left behind two enormous difficult-to-manage waste streams: gigatonnes of alkaline industrial waste on the ground and gigatonnes of carbon dioxide in the atmosphere. Through Industrial Mineralization, we can repurpose one to address the other.
Community
The only road to net zero
runs through Indigenous lands
Most mine sites are located on the traditional territories of indigenous peoples.
We are committed to protecting these lands for future generations.
Find out more about our commitment
Wandjina style Aboriginal rock art, Raft Point, Doubtful Bay, The Kimberley, Western Australia
We need bright minds,
to build a brighter future
We’re always looking for passionate people who want to join our mission to stabilize the climate.
Learn more
