Company founded under the aegis of the Société des Etains et Wolfram du Tonkin, with the assistance of several first-rate firms: Société Financière Francaise et Coloniale, Banque de l'Indochine, Union Parisienne, Banque Mirabaud, etc.

The deposit of the Bao-Lac gold mines is made up of auriferous alluvium from the Upper Sông-Nang.