The Mésage mine is a former iron mine during the period 1800 - 1870. It was known for its mineral deposits during its operation. It is only since the 1990s that the crystal craftsmen once again became interested. This conference will trace the history of the mineralogy of this mine and the epic of the discoveries which have succeeded since the 90s. It will also show the means implemented for a reasoned exploitation of the minerals. Photos and videos will be presented. .