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Minteke Area is underlain by sedimentary formations of Sandalash suite of the Cambrian- Ordovician age, composed by interlayers of shales, siltstones, sandstones and limestones. Intrusive rocks are represented by dioritic boss like body of 2x3 km. size and by dykes of diorite porphyries and granodiorite-porphyries. Faulting is of north-west strike to sublatitudinal, with few faults of north-east strike.

North – west trending faults have near-vertical dips of 75-80 degrees to north-east, while the dip of north-eastern trending faults is shallower at 40-70 degrees to south-east. The Faults are well-manifested by zones of crushing, iron-staining, bleaching and silicification. Thickness of the zones ranges from 1 m. to 10 m. Visual on strike extension is from 10-250 m.

In the 2008 field season, prospecting work was accomplished by 30 km of geological traverses, with sampling, geological-geochemical profiles at zones of silicification and iron-staining. In total 30 km. of traverses and 113 chip samples were accomplished.

Sampling in Minteke took place during the Soviet period, when some Au anomalies were first defined. Additional sampling was done by Newmont and Chaarat Gold in 2006. Sampling in 2008 was focused on altered areas defined in satellite photos. As a result, a NW-SE trending zone (transverse to the Chaarat NE-SW trending zone) was defined. Highly anomalous samples (Au up to 3.4 ppm) from a zone 2-3meters wide were taken over a strike length of more than 2.5km, open ended on both sides.

Sulfide mineralization - pyrite, cahlcopyrite and sometimes stibnite is rarely met in zones of silicification, iron-staining and bleaching. Secondary minerals such as limonite, malachite and sometimes azurite are widespread.


Figure 13: Minteke area Figure 13: Minteke area – Geology. Green – Cambro Ordovician Chaarat formation, Pink – Permian intrusives. Gold anomalies defined by red triangles (Newmont 2000) and circles (Chaarat, 2006, 2008).


The attractive features of this area is the presence of highly significant stream sediment Au result (>300ppb) down stream from possible extension of the Contact Zone between Tulkubash (Orange color in Figure 2) and Chaarat rocks (Green color in Figure 2) and the presence of an intrusive (Pink) associated with widespread alteration (stippled red in Figure 2). While few traverses in 2006 failed to demonstrate mineralizaton, another attempt was made by Chaarat during 2008 to understand the mineralisation.

The area is underlain by interlayered siltstones, sandstones, limestones, siliceous shales and cherts of the Chaarat and Karator formations. Complex of small intrusions of diorites, diorite porphyrites, granodiorite porphyries, rhyolite porphyries is present. Dykes thickness is 3-30 m.; strike extension is 200-2000 m. Hornfelsing and chilled margins are observed along the contacts with sedimentary formations.

Steeply dipping (60-70 degrees due North) faulting of north-western and east-west directions (strike azimuth of 250-290 degrees), is wide spread. Faulting is accompanied by cataclastic zones with thickness of 5-15 m. along which iron staining, bleaching and silicification are observed. There are quartz veins, lenses of 0.3 to 3 m. thickness and strike length of 5-50 m. Ore mineralization (pyrite, chalcopyrite, molybdenite and galena) encountered during prospecting is mostly confined to zones of silicification, quartz veins and to lesser extent to zones of bleaching and iron-staining.

This zone is at least 2 km long and remains open ended on both sides. It is associated with large mineralized intrusive in the Chaarat footwall which locally carries economical grades of Mo (>1% Mo) and anomalous W (up to 0.05%). Mineralization is of Au-Ag-As, just as in Chaarat. Gold mineralization reaches 5 g/t in outcrops, usually near the contact of the diorite with sandstones. The width of the zone is about 1-2m, but trenching into buried wall rocks could increase it substantially. A new zone with Cu grades >1% and Ag grades>100 g/t has been identified 4km to the NW, within the Tulkubash formation. Pyrite, chalcopyrite, galena, and copper green (malachite and azurite) are noted within silicifed and iron stained sandstones.



Figure 14: Tayalmish – Minteke area. Tayalmish area at upper part. Green – Chaarat formation, Orange – Tulkubash formation. Pink – granitic intrusive. Pale blue – glaciers. Red stipples – alteration. Red circles – Au, Green triangles – Mo, Turquoise squares – Cu, Blue triangles – Ag.