Wikipedia
Kinza
was the Tokugawa shogunate's officially sanctioned gold monopoly or gold guild ( za) which was created in 1595. Initially, the Tokugawa shogunate was interested in assuring a consistent value in minted gold coins; and this led to the perceived need for attending to the supply of gold.
This bakufu title identifies a regulatory agency with responsibility for supervising the minting of gold coins and for superintending all gold mines, gold mining and gold-extraction activities in Japan.