5.1x00a0;In the primary metallurgical processes used by the mineral processing industry for copper bearing ores, copper and silver associated with sulfide mineralization are concentrated by the process of flotation for recovery of the metals.

5.2x00a0;This test method is a comparative method and is intended to be a referee method for compliance with compositional specifications for metal content or to monitor processes.

5.3x00a0;It is assumed that all who use this method will be trained analysts capable of performing skillfully and safely. It is expected that work will be performed in a properly equipped laboratory and that proper waste disposal procedures will be followed. Appropriate quality control practices must be followed such as those described in Guide fa00004">f="/SUBSCRIPTION/NewValidateSubscription.cgi?E882-HTML">E882.

1.1x00a0;This test method covers the determination of silver in the range of 13 x03bc;g/g to 500 x03bc;g/g by acid dissolution of the silver and measurement by atomic absorption spectrometry. Copper concentrates are internationally traded within the following content ranges: