The geological structure of the Tunka Goltsy (the Tunka Range) of the East Sayany is characterized by a complex nappe-fold structure, composed mainly of Paleozoic terrigenous and carbonate rocks and their metamorphosed analogues [1–3]. It is generally recognized that the nappe-fold structure of the East Sa-yany, including its southeastern segment, regarded as the Tunka terrain [3] or Ilchirskaya zone [4], formed in the Ordovician as a result of collision between the Tuva–Mongolian microcontinent and the Siberian continent. As referred to in [5], the Ordovician–Mid-dle Paleozoic deformations over the entire vast territory of Central Asia, from the Olkhon zone of the Pribaikalie to the North Kazakhstan, were manifested as a result of the closing of the oceanic basin and the subsequent collision between the Kazakhstan– Baikalian complex continent (including the Tuva– Mongolian microcontinent) and the Siberian continent. In the Ordovician the Olkhon nappe-overthrust zone was formed along the southeastern framework of the Siberian Craton. In addition, the metamorphism was manifested over the entire vast territory of the East Sayany that could probably be connected with nappe formation. In the Late Ordovician–Silurian, the oblique slip-thrust structures, magmatism, and meta-morphism were manifested in the Sangilen highlands and Tuva. Later, the deformations continued. In the Late Devonian–Early Carboniferous, the dextral strike-slip fault Charysh–Terektinskaya zone was formed; in the Late Carboniferous, the Kurayskaya and Kuznetsko–Teletsko–Bashkaus sinistral strike-slip shear zones were formed.