The Sasa mine is located in the north-eastern region of North Macedonia, approximately 150km east of the capital city, Skopje, and 10km north of the local town, Makedonska Kamenica. Sasa lies within the Serbo Macedonian Massif, which hosts a large number of zinc and lead deposits and extends through Serbia, North Macedonia, Bulgaria, eastern Greece and into Turkey.
The mine’s Svinja Reka and Golema Reka deposits are located on the eastern flank of a copper molybdenum porphyry deposit at Osogovo. Mineralisation occurs as stratiform deposits hosted predominantly by schists and marbles at Svinja Reka and by gneisses at Golema Reka.
Hydrothermal fluids and bedding parallel faulting are responsible for the metasomatism of the host sediments that produce the skarn and base metal mineralisation. The deposits are well defined lenses of zinc-lead-silver mineralisation, which dip at about 35 degrees and range in thickness from 2 metres to 30 metres.
