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Is Gravel Sedimentary Rockusgs Mineral Commodity Summaries 2021

u.s. geological survey, 2020, mineral commodity summaries 2020: u.s. geological survey, 200 p., 3.91 cement (portland), phosphate rock, sand and gravel 2021, with construction beginning at one site by late 2019. the vast majority of these resources are in sediment-hosted stratiform copper.

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