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Mining giant Mosaic wants to expand its phosphate waste stack in Hillsborough

If permits are approved, construction at the Riverview plant would begin in 2028, according to a preliminary company presentation.
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This aerial view shows Mosaic's phosphogypsum stack in Riverview on Oct. 24. The company is looking to expand its footprint to the land in the foreground.
This aerial view shows Mosaic's phosphogypsum stack in Riverview on Oct. 24. The company is looking to expand its footprint to the land in the foreground. [ DIRK SHADD | Times (2025) ]
  • Max Chesnes - Environment and Climate Reporter

    Max Chesnes is the Tampa Bay Times' environment and climate reporter, covering public lands, water quality, wildlife and everything in between. Reach him at mchesnes@tampabay.com or follow him on Instagram @MaxChesnes.

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