A very rich group of cube-octahedral galena crystals, brilliant, nice luster, defined faces and edges, and with a better quality than usual for the locality. They are disposed on a matrix covered by brilliant quartz crystals and small honey color sphalerite. Accompanied by aggregates of golden pyrite crystals, bright and sharp, flattened brilliant marcasite and chalcopyrite.
These mines are located approximately 50 km south of Alnif, near the border with Algeria. This area was already mined in medieval age for the extraction of copper. In the 60s of the last century, French companies expanded shafts and mineral extraction.