Waupaca Foundry has a long history of reusing foundry sand as many times as possible in the production of iron castings. Then, Waupaca Foundry promotes environmentally beneficial strategies to repurpose these sands, as well as slags and sand fines, that can no longer be used in the casting process. One of the most exciting of these secondary uses is to employ it as geotechnical fill in mine reclamations.
“The Midwest has lots of gravel mines and sandpits,” explains Environmental Coordinator Bryant Esch. “Once out of service, actions must be taken to responsibly convert the land to its post-mining use.” Regulations such as Wisconsin’s Ch. NR 135, Wisconsin Adm. Code have been established to create a uniform standard for reclaiming these inactive mine sites. The purpose of such laws is erosion prevention, site stabilization, and the achievement of a productive post-mining land use such as agriculture, recreation or wildlife habitat improvements.
Especially for small mine owners, this posed a challenge. Bringing a historical mine back up to grade was not a cheap process. However, foundry sand has proven to be an effective, less expensive way to recover the mine footprints.
To date, Waupaca Foundry has contributed hundreds of thousands of tons of foundry byproducts to fill in mines:
• 524,000 cubic yards used to restore sand and gravel pits in Wisconsin
• 95,000 cubic yards used annually in Kentucky
Data is available upon request to demonstrate the effectiveness of
Waupaca Foundry sand for use in mine reclamations.