MINERALIZATION

The base rocks are meso-and catamorphic schists and gneisses containing lenses of biotite in which occur aggregation of emerald, alexandrite, and corundum.

Usually small pegmatite lenses are also present, apparently formed by the remobilisation of mineral matter in the base rocks and recrystallized along bedding planes.

Working are opencuts exposing biotite mica in which occur the emerald crystals and from which rocks are easily separated.