Nasedkino gold ore deposit is currently on the stage of designing a mine to produce 1 mln. tons of ore per year. The company holds the ChIT 016663 BE mining license valid through 01.12.2025.
The deposit is located in Mogochinsky District, north-west of Zabaikalie Territory of the Russian Federation. The nearest populated areas are Mogocha district center, Chaldonka and Ksenjevka settlements, and Kisly Kluch railway station.
Nasedkino deposit and the district center Mogocha are connected via the 56-km year-round earth road.
The Nasedkino deposit is formed by the three contiguous mineralization zones – Pridolinny, Zhelanny and Gora Pyataya, all having the same mineralization geology, structure and position. The licensed area is 11 km2.
With respect to the regional geological minerogenic zoning of Zabaikalie Territory, the deposit is located on the Uryumskoye ore field, within the Itaka-Mogocha-Kulinskiy ore cluster of the same-name gold ore zone of gold-molybdenum ore belt of Yablonovo-Stanovoy metallogenic province.
Structurally, the property belongs to the south-west part of Stanovoy fold area of Yryumo-Nyukzhinskaya zone of the central part of Mogocha horseback of Archaean strata represented by gneisses and crystalline schist of granulite facies of metamorphism.
Ore-bearing and well represented are the Archaean alternating light-colored and dark-colored pyroxene-garniteferrous granulites, quartz-biotite-plagioclase gneisses often containing sillimante, hypersthene, graphite, high-aluminum crystalline schists and amphibolites. The Archaean strata is folded into isoclinal NW trending folds (320-340°) with deep SE dip (60-80°) intruded by the Early and Middle Jurassic granitoid porphyrite dykes of the Amanan and Amujican Complexes. The Late Jurassic intrusions are ore-bearing ones.
As for the mineral composition, the deposit is a gold-sulfide formation. The gold-bearing ores mostly include pyrite, and, in a lesser degree, chalcopyrite, and in even lesser degree, galenite, sphalerite, fahlite, arsenopyrite, molybdenite, magnetite, titanic iron ore, chalcocite and other sulfides. Primary nonmetal minerals are quartz, plagioclase and K-spars, and secondary – biotite, pyroxene, sericite, chlorite and garnet. Sulfide content varies from 1-2% to 20-30%, and the average sulfide content is 5-10%. Gold grade does not directly depend on the sulfide content, while major quantities of gold (above 60%) are coupled with sulfides – mostly in intergrowth with pyrites, and, in much lesser degree, with chalcopyrite, fahlite and bismuth minerals. The remaining gold is dispersed as free gold in quartz and limonite. Gold grades are 0.002 to 1.2 mm, with grades of 0.02-0.08 mm prevailing.
Silver may be anticipatorily considered as an associated component. Silver/gold ratio varies with properties and cut-off, and the deposit’s average silver/gold ratio is 1:2.
Gold is distributed unevenly and is present as gold nuggets both within the properties and within the mineralized zones. The extreme values of 880 g/t were marked at Zhelanny, 425 g/t – at Gora-5, and 205 g/t – at Pridolinny properties.
RESERVES AND RESOURCES
The reserves and resources at Nasedkino deposit are:
|Property||Category||Ore, thousand tons||Au, g/t||Au, kg|
|Total: Nasedkino||Indicated||14.3||1.5||20 778|
|Total: Uryum||Inferred||5.9||1.7||10 264|
|Total: Nasedkino + Uryum||Indicated||14.3||1.5||20 778|