ISO 12743:2021(en), Copper, lead, zinc and nickel …
ISO 13543, Copper, lead, zinc and nickel sulfide concentrates — Determination of mass of contained metal in a lot [3] Gy P., Sampling of Particulate Material — Theory and Practice, Elsevier Publishing Company, Amsterdam, 1982 [4] Pitard F.F., Pierre Gy's Sampling Theory and Sampling Practice, Second Edition, CRC Press Inc., Boca Raton,1993 [5]
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