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  • Office Hours: Mon–Fri 8am–5pm

Black slag pile
White Blackheart Slag logo

Practical Results.

We process the steel slag, which is a byproduct from making steel, crushing and screening it to make aggregate chips and sand for asphalt. Much of the slag begins life as lime which is sold to SSAB by Linwood Mining for the purification of the steel. Approximately 80% of our product is produced to go into SMA (Stone Mastic Asphalt) hot mix asphalt. With the help of our sister company, McCarthy Improvement’s asphalt division, you’re able to see our product in both Iowa and Illinois on Interstate 80.

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