Wassat (sorry)30 Mar 2012 21:51
15 km to the west of Cholokkaindy, the Nasonovskoye deposit is currently being evaluated by a Chinese group. An area of sedimentary rocks including sandstone, siltstone, amphibolites, limestone and conglomerates covering some 12 km by 8 km in size is surrounded by granitoids and probably represents an inlier of country rocks in the roof of an intrusion. Skarns have developed after limestone and form veins, lenses, and pockets along the contact with the granites. The veins carry gold associated with copper sulphides and secondary minerals. To date, 15 orebodies have been identified, 7 of which have resource estimates. The veins can be up to 450 m long and up to 2.4 m wide. In 2002 the reserves were estimated in the C2 category at 5.612t Au at 7.47 g/t and are currently catalogued in the State Balance. Geologists working there believe that the reserves can be increased to 12 to 15 tonnes if exploration at deeper levels of 3,200 m to 3,500 m is successful. A visit by Premier’s gold geologists on 22 October 2011 confirmed the general geology and found that the granites are similar texturally and chemically to the Ordovician granites occurring in the Cholokkaindy region southwest of the Cholksky Fault. Marbles and skarnified siltstone and limestone outcrop as well as ore bodies with abundant iron and copper mineralisation suggesting a similar style of mineralisation to Cholokkaindy, namely hybrid skarn and porphyry style mineralisation. Quartz veining and brecciation were observed in the interior of an old adit, which remains open for 15 m to 20 m. Occasional felsites dykes were encountered as well as blocks of syenite, which is exotic to the Cholokkaindy lithologies. Malachite staining was ubiquitous and some pyrite and other sulphides were observed, and the abundance of ore minerals suggested that grades would be significant, though no details have been released.
The Granitogorsky deposit occurs some 15 km northwest of Cholokkaindy, on the border between Kazakhstan and Kyrgyzstan. The deposit is similar to Cholokkaindy, comprising hydrothermal mineralisation associated with tectonic zones of the Asparinsky granitic massif. The veins are mainly quartz-carbonate with various sulphides: galena, sphalerite, pyrite, chalcopyrite. arsenopyrite, pyrrhotite, boulangerite, and tennantite. The mineralisation exhibits massive, disseminated or banded and brecciated textures. Granitogorsky was mined in the past; resources along 250 m of strike of 80 m – 150 m depth were estimated historically as 20,000t of lead of unstated grade, 1,700t of copper at unstated grade, 2,015kg gold and 66.4t of silver.
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