Carbon removal, measured in the soil
We spread crushed basalt on farms that already need lime. It turns carbon dioxide into bicarbonate that stays put for more than 10,000 years. Every tonne we sell is cored, verified and retired on a public registry.
Progress
The numbers so far
41,806 t
Removed and verified
Delivered to buyers since 2022, every tonne checked by Northfold Registry.Delivered to buyers since 2022. Northfold Registry checked every tonne before it was sold.
128,000 t
Under contract
Offtakes signed for delivery through 2030.Offtakes signed with buyers for delivery through 2030.
212
Partner farms
Across six regions, 36,400 ha spread so far.Across six regions, with 36,400 ha spread so far.
How it works
From quarry to registry in four steps
Source the rock
We buy fine basalt from quarries within 150 km of each farm. It is a by-product they already stockpile, so no new rock is mined for us, and short hauls keep transport emissions under 2% of what the rock removes.
150 km
furthest quarry we buy from
Spread it on the field
Farmers spread the rock with the machines they use for lime, usually straight after harvest. Most fields get one application every three years.
20–40 t
per hectare
Let the rock weather
Rain carries carbon dioxide into the soil as carbonic acid. It dissolves the rock and forms bicarbonate, which drains to streams and rivers.
24 months
of fastest weathering
Measure what it removed
We core every field before spreading and twice a year after, and sample the water leaving it. The lab measures what the rock has lost.
40 cm
core depth, 12 cores per field each round
-
We buy fine basalt from quarries within 150 km of each farm. It is a by-product they already stockpile, so no new rock is mined for us, and short hauls keep transport emissions under 2% of what the rock removes.
150 km
furthest quarry we buy from
-
Farmers spread the rock with the machines they use for lime, usually straight after harvest. Most fields get one application every three years.
20–40 t
per hectare
-
Rain carries carbon dioxide into the soil as carbonic acid. It dissolves the rock and forms bicarbonate, which drains to streams and rivers.
24 months
of fastest weathering
-
We core every field before spreading and twice a year after, and sample the water leaving it. The lab measures what the rock has lost.
40 cm
core depth, 12 cores per field each round
Registry
Every tonne has a public record
A tonne only counts once it is verified and retired. Each batch lists the field it came from and who it was retired for.
- batches batches issued since 2022
- 118
- retired retired for buyers
- 35,606 t
- available verified and ready to retire
- 6,200 t
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