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Location: 37 km SW from Ala-Buka, Kyrgyzstan
109 Kalyk Akiev StreetBishkekKyrgyzstan720010
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In 2021, KAZ Minerals Ltd. was wholly acquired by Nova Resources BV.
The Bozymchak copper-gold (Cu-Au) skarn deposit is located within in the ChatkalKurama region of the Tian Shan belt.The Bozymchak deposits were generated by intrusion of a large granitoid stock with pinkish-grey porphyritic granites of the Dzhalgyzuriuk massif into carbonate cauntry rocks of Devonian and Carboniferous age. Devonian sediments are polymict clastics, calcareus sandstones and limestones of Frasnian-Famennian age. Carboniferous sediments are sandstones and limestones, sometimes siliceous and bituminous, of Tournaisian-Visean age and pyroclastic sedimentary rocks (andesitic and dacitic tuffs) of mid-Carboniferous age.Sedimentary, intrusive, and metamorphic rocks form the key stratigraphic units within the Bozymchak Cu-Au deposit. Rock types comprise marbled and dolomitic limestones, skarn, serpentinite and granodiorite (from top-down):• Limestones form the hanging wall and are very strong, coarsely bedded with minor fracturing.• Skarns of ore bodies are timed to coincide with the contact of the granodiorite intrusion with limestone.• Serpentinites are the weakest rocks in the deposit and alternate with skarn blocks. Serpentinite is prone to unravelling, particularly when in contact with water.• Granodiorites form the hanging wall and are strong with discontinuous jointing.Mineralization is generally in skarn zones, in the form of disseminated sulphides with associated gold. The major sulphide component is chalcopyrite with lesser bornite and covellite; there is some rare presence of sphalerite and arsenopyrite. Surface oxide mineralization is only weakly developed and is primarily marked by the occurrence of malachite. The skarn mineralization is of garnet-wollastonite and garnet-pyroxene types; metamorphosis of limestone and dolomite has occurred locally to form marble and siliceous limestone. The thickness of the skarn horizon varies from a minimum of around 7 m up to 85 m.To the east of the main central deposit sulphide zones are found which contain chalcopyrite, pyrite and pyrrhotite, with, in this zone, serpentinites which are the products of alteration of pyroxenite; some fibrous asbestos is also found. The Bozymchak deposit comprises four sectors separated as discrete areas by faulting: - South-western sector;- Central sector;- Eastern sector;- Davan sector.In the Central sector the skarn horizon occurs along a bow-shaped strike along the contact of country rock and the intrusion, along a 2 km strike with dip to the south of between 75-86 degrees.
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