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A naturally fractured limestone specimen

Secure, high-purity calcium carbonate
from Idaho for the industries that feed us.

Explore applications

A deposit owned by native Idahoans near Darlington, Idaho, with more than a billion tons of proven calcium carbonate. Mined at Darlington, milled at Gooding, tested by independent labs since the early nineties.

97–99.9%
Calcium carbonate, typical analysis
3,6OO+
Acres at the Darlington deposit
1B+
Tons of proven resources
2
Idaho sites, source to mill
The US Calcium deposit near Darlington, Idaho
A block of high-calcium limestone

Darlington, IdahoCuster County · Highway 93

Darlington holds the deposit, the crushers and the screens. Gooding holds the mill. One operation, one source, every grade from landscape rock to −300 mesh.

About US Calcium

ExtractionDarlington, Idaho

CrushingDarlington, Idaho

ClassificationDarlington, Idaho

MillingGooding, Idaho

DeliveryTo your operation

The process

Material is selected from the deposit and tested for purity before it enters production.

The rock is reduced in stages. Its crystal structure stays intact because nothing is burned and nothing is added.

Screens separate landscape rock, agricultural grit and process fractions, each held to its grade.

6″ × 12″ · 3″ × 5″ · 3″ minus · 1″ × 2.5″ · 1″ minus · ¼″ × 1″

Finer material continues to Gooding, where it is milled into the blend and powder grades.

−10 blend · −200 mesh · −300 mesh

Bulk loading on your schedule. A load ticket and a certificate of analysis travel with every shipment.

Every load leaves with a certificate of analysis. Purity, heavy-metal screening, moisture and particle size, documented before the truck moves.

  1. 01
    Analysis with every load.A certificate of analysis accompanies every shipment.
  2. 02
    Independent laboratory testing.The deposit has been tested since the early nineties. Current results on request.
  3. 03
    Sizing to your specification.Particle-size analysis for every grade, from crushed stone to fine powder.
Quality & analysis
Milled calcium carbonate powder
  1. 6″ × 12″
  2. 3″ × 5″
  3. 3″ minus
  4. 1″ × 2.5″
  5. 1″ minus
  6. ¼″ × 1″
  7. −1O blend
  8. −2OO mesh
  9. −3OO mesh
Grades

Crushed & screened · DarlingtonCaCO₃ · 97–99.9%

Bulk delivery across nine western states and Western Canada, on standing orders or on call. Two Idaho sites, one source, a load ticket with every truck.

  • Idaho
  • Utah
  • Montana
  • Wyoming
  • Nevada
  • Oregon
  • Washington
  • California
  • Colorado
  • Western Canada
Plan deliveries

Taking care of the resource. Mechanical processing, no burning and no added chemicals, run by people who live where the stone comes from.

A worker on a bench above the deposit at dawn
  1. 01
    Mechanical, not chemical.Crushed, screened and milled. Not burned, nothing added.
  2. 02
    People and place.Employee safety and responsible use of the land are our standard operating procedure.
  3. 03
    Rooted in Idaho.Owned by native Idahoans, with investment in the communities around Darlington and Gooding.
About US Calcium

Let the material prove itself. Three steps from first call to standing order.

  1. Step 01

    Share your specification.

    Tell us the application, the grade you need and the volume.

  2. Step 02

    Evaluate a sample.

    Test the material in your own operation with its certificate of analysis.

  3. Step 03

    Plan the deliveries.

    Standing orders or on call, bulk-loaded on your schedule.

Secure yoursupply.

Tell us the application, the grade and the volume. We’ll confirm the analysis, send a sample and plan the first delivery.

Plan your supplyOr call our team208-858-5250
Loading crushed limestone at blue hour
US Calcium
ApplicationsHealth & nutrition
Request specifications

Idaho-mined.
Darlington · Gooding, Idaho

Talk to our team208-858-5250

Contact

Call our team208-858-5250

Talk to our team

Tell us what you need. A person on our team will get back to you.

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