Mandatory application of this cargo schedule: applies only to cargoes that would fall under packing group (PG) III as specified in the IMDG Code if they were carried in packaged form. See also "mineral concentrates" schedule. Description: refined ores where valuable components have been enriched by eliminating the bulk of waste materials. Most common sulphide concentrates in this entry are : zinc concentrates, lead concentrates, copper concentrates and low-grade middling concentrates. According to the IMSBC Code, the particle size is generally small even though agglomerates sometimes do exist in concentrates which have not been freshly produced. Bulk density (kg/m3): 1,700 - 3,230.