Home / Standards / GB/T 13449-2021 GB/T 13449-2021 Active Method for sampling and sample preparation of gold lump ores 金块矿取样和制样方法 Standard Type GBT ICS 77.120.99 CCS H 04 Status 现行 Issue Date 2021-04-30 Implementation 2021-11-01 Responsible Dept 中国有色金属工业协会 Drafting Unit N/A