Holcim New Zealand has received resource consent to use mussel shells to supplement limestone in its cement. The company has received resource consent to discharge contaminants from stored mussel shells at its Cape Foulwind quarry, near Westport. Holcim's West-port works manager Chris Dempsey said: "It's the first time that mussel shells have been used in the cement-making process, so as far as we know." About 400t of shells would be trucked to the quarry weekly from a factory with large stockpiles. The plan envisages up to 20,000t of shells would be stored at the Cape Foulwind quarry for between four and six months.
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