The Tellure mining park extends on the former mine of Saint-Jean Engelsbourg. After the discovery of its silver vein by Collin Schwartz in 1549, the Val d'Argent experienced significant prosperity. Six other silver lodes were uncovered in the mountain of Neuenberg, but Saint-Jean's remained the largest. Its galleries were pierced over a length of 2,296 ft (700 m) and a height of 1,640 ft (500 m). Foundries multiplied around the mines, and the veins were divided into seven concessions which merged into four in the 16th century.