Imiter Mine

History · Geology

About Imiter Mine

The Imiter Mine in the Anti-Atlas Mountains of central Morocco is the country’s largest silver producer and one of Africa’s most important Ag districts. Operating commercially since the 1990s under SMI (Société Métallurgique d’Imiter), the mine’s historical roots trace back to the 8th century — making Imiter one of the oldest continuously-known silver localities in the world.

Geology

The deposit is a Neoproterozoic-age epithermal Ag-Hg vein system hosted in volcanic and metavolcanic rocks at the southern margin of the Anti-Atlas. Native silver, mercury sulfide, and Ag-sulfosalt veins are emplaced along complex fault networks; the mineralogy is characteristically silver-rich and mercury-bearing.

Notable Minerals

Native silver (wires, dendrites, leaves — among Africa’s best), acanthite (Ag₂S — common silver ore), pyrargyrite (dark ruby-red Ag-Sb sulfosalt), proustite (light ruby-red Ag-As sulfosalt), galena, sphalerite, calcite (often massive gangue), dolomite, quartz. Imiter polished sections show classic native-silver-on-acanthite paragenesis.

Collector Notes

Imiter native-silver-on-acanthite specimens entered the international collector market in the 2000s and now complement the historical European silver classics from Příbram, Kongsberg and Cobalt-Ontario. Fresh material is occasionally released through Moroccan dealer networks.