May 18, 2021 · Galena was the primary ore mineral. Ore was found in the La Motte down to 100 feet below the contact with the Bonne Terre, and throughout the 400foot thick Bonne Terre. Mineralization was disseminated in favorable parts of the Bonne Terre, with galena replacing dolomite; ore was also found at beddingplane contacts, in fracture zones and as ...