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What is selenium and how is it related to phosphate?

phosphate selenium
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What is selenium and how is it related to phosphate?

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Selenium is elevated in some of the overburden that is removed in order to access the phosphate ore seams. Generally this overburden is described as center waste shale. Because Simplot can readily identify center waste shale, it is selectively handled and placed back in the bottom of the pit backfills during reclamation to lessen the potential risk of mobilizing selenium to the environment.

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