Why do we have to distinguish between mineral resources and mineral reserves when making projections about how

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Why do we have to distinguish between mineral resources and mineral reserves when making projections about how long a specific mineral will be available? Why it is difficult to obtain an accurate appraisal of total resources for a particular mineral?

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Environment

ISBN: 978-1118875827

9th edition

Authors: Peter H. Raven, David M. Hassenzahl, Mary Catherine Hager, Nancy Y. Gift, Linda R. Berg

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