![Knife River seeks to expand rock mining operation outside St. Helens | Local News | columbiacountyspotlight.com Knife River seeks to expand rock mining operation outside St. Helens | Local News | columbiacountyspotlight.com](https://bloximages.chicago2.vip.townnews.com/columbiacountyspotlight.com/content/tncms/assets/v3/editorial/d/09/d0949852-9d0f-11ed-a50b-87fe8a324ef6/63d1c934f2c5b.image.jpg?crop=1762%2C925%2C0%2C125&resize=1200%2C630&order=crop%2Cresize)
Knife River seeks to expand rock mining operation outside St. Helens | Local News | columbiacountyspotlight.com
![Nodules of KRF from quarries in Dunn County display widely variable... | Download Scientific Diagram Nodules of KRF from quarries in Dunn County display widely variable... | Download Scientific Diagram](https://www.researchgate.net/publication/323454615/figure/fig18/AS:599035979235351@1519832715713/Nodules-of-KRF-from-quarries-in-Dunn-County-display-widely-variable-fluorescence.png)
Nodules of KRF from quarries in Dunn County display widely variable... | Download Scientific Diagram
![New name for homegrown business as Concrete Materials transitions to Knife River - SiouxFalls.Business New name for homegrown business as Concrete Materials transitions to Knife River - SiouxFalls.Business](https://www.siouxfalls.business/wp-content/uploads/2022/03/South-Quarry-pic2-copy-scaled.jpg)
New name for homegrown business as Concrete Materials transitions to Knife River - SiouxFalls.Business
![Knife River Offers $65M to Turn Fairgrounds into Quarry; Why Not Move Sioux Empire Fair to Wholestone Farms Slaughterhouse Site? – Dakota Free Press Knife River Offers $65M to Turn Fairgrounds into Quarry; Why Not Move Sioux Empire Fair to Wholestone Farms Slaughterhouse Site? – Dakota Free Press](https://dakotafreepress.com/wp-content/uploads/2022/07/WHLyonsFairgrounds-KnifeRiver.jpg)