The Sukhoy Log deposit is located in Siberia,the very center of the Lena gold basin. The distance from it to Irkutsk is 850 km. This deposit was discovered as early as 1961. In the 70s it was actively explored, and in the 80s extensive preparatory work was carried out here. The last time the draft terms of the auction for the development of this vein of the Ministry of Environment proposed to the government in 2016.
Расположено месторождение Сухой лог среди пород Upper Proterozoic marine sandstones, phyllite and carbonate shale. Actually, its gold-bearing formation body itself is elongated along the axis of the anticlinal tilted fold. The richest ore deposits contain 4-10 grams of gold per tonne of waste rock. They are located in the layers of black slate. In particular, a lot of gold is available at the intersection of the latter with the axial fold zone. During such exploration, two very promising ore pillars were discovered.
The anticlinal gold fold itselfSukhoy log deposits stretched more than 3 km from east to west. Next, the ore falls under the ground. According to preliminary data, this huge deposit accounts for about 28% of Russia's gold reserves. The estimated resources of the metal are about 1953 tons. The Sukhoy log deposit is also promising in the sense that 1541 tons of silver can also be mined here.
In the late 80s of the last century by the decision of the government in the area of future developments:
built power lines;
started the construction of the Telmama hydroelectric station;
built the Taksimo-Sukhoy log road;
reconstructed the runway of the city of Bodaibo.
Directly on the field itself, preliminary work was carried out on the construction of a gold extraction plant.
Studies in the 70s showedthat most of the Sukhoy log gold is associated with sulfide minerals (mainly pyrite). The interval of the content of this metal in the rock is 0.5-10 g / ton. The average is 2.7 g / ton.
The first operator of this rich deposit inThe 90s of the last century became the company "Lenzoloto" with Australian partners. However, this firm development terms, unfortunately, thwarted. Therefore, in 1998, her license was revoked. Subsequently, statements about plans to appoint a new auction were heard from the Ministry of Natural Resources almost annually. However, things only got off the ground in this respect only in 2016.
Dry log - gold deposit, explorationwhich in the 70s were engaged in such authoritative institutions of the country, such as, for example, MISiS, VIMS, VNIIHT, etc. However, in 2007-2008, the Ministry of Environment decided to reassess its reserves. This work was entrusted to the Institute. The result of the research conducted by the specialists of this institution is a new scheme for the processing of ore deposits. TsNIGRI engineers and geologists have proposed using photometric separation for work with rock with subsequent flotation-gravity technology. This technology is considered to be much more efficient than the one that was used once in the USSR.
Разрабатывать месторождение Сухой лог (Иркутская region) will be the company "Polyus". On January 27, 2017, the Ministry of Natural Resources sold the license to her. This society belongs to Said Karimov. In addition to this company, only Bodaibo Gold Corporation participated in the auction. The lot was sold for 9.4 billion rubles. At the same time, as a advance on December 21, 2016, the company Polyus contributed 8.5 billion. The company created a subsidiary company SL Gold, specifically to participate in the auction.
So on field Dry log bid for a total of two contractors. This is due primarily to the fact that the state put up the conductors for auction on very harsh conditions. For example, foreign contractors were excluded from participation in the auction. Also pretenders are obliged in some cases to attractstate-owned companies. The result of this policy of the Ministry of Natural Resources was even the fact that Gold of Bodaibo took part in the bidding no more than formally - just to make them take place.
По оценкам Минприроды, Сухой лог - золоторудное the field, the development of which will require a total of about 4-6 billion dollars of investments. At the initial stage, Polyus plans to conduct additional exploration work at the field. To this end, it is planned to attract foreign specialists as well. According to the company, it will take about 3-4 years in total to check the resources of the vein. Subsequently, the company's specialists will evaluate the possibility of using the same ore processing technologies on the Sukhoy log as on the Verninsky gold-bearing deposit located nearby (also owned by Polyus).
