In 1921, the Shanghai gold exchange was founded which marked the existence of formal gold market in China with standardized gold as its main trading item.

The detection result of the gold-labeled strip could be made a standard color reflected series,the repeatability is very well,minimum limition 1000μg/L,and the recovery was also high.

Intended to put emphasis on brief description and analysis of relations of the typical rockgold deposits in Gansu Province to their anriferous strata,in order to search into the lithofacies and lithology and the goldexploring clues from the point of view of goldbearing strata.

Rule for rounding off numerical value of metallurgical standard;