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Glossary of Mining Terms - rocksandminerals Fossil Knightia fish for sale from the Green River Formation. Tailings - Wikipedia Tailings, also called mine dumps, culm dumps, slimes, tails, refuse, leach residue or slickens, terra-cone (terrikon), are the materials left over after ... Numerical NAICS Code List 2017 | Class Codes This page contains a numerical NAICS code list 2017. Users can view and lookup an index of 2017 NAICS codes in numerical order.    Read More