Location and History
Neryungri mine (Tabornoe gold deposit) is located in the southwestern Sakha (Yakutia) Republic in Russia some 125km northeast of the Ikabya station on the BAM railway. It is around 200 km from the town of Chara and is accessible via an all-season road (a 10 hour journey) or alternatively a one hour helicopter flight to site. The workforce is accommodated on site and power is generated by diesel generators.
Tabornoe ore is mined at a rate of 3Mtpa, ore grades at Tabornoe are typically between 1.0 and 1.3 g/t with gold recovery from heap leach and downstream adsorption and desorption circuits varying between 63% and 73%.
The area is mountainous the project is at an elevation of 1,100m to 1,300m above sea level. The climate is very cold much of the year, there is snow cover between October and May and a short hot summer. Rivers are frozen from November to April and permafrost extends to approximately 400m depth although up to 3m of soil may defrost in the summer.
Nordgold acquired the mine in 2007. The Mining licence for Tabornoe covers an area of 0.93km2 and has been held by Neryungri since 2001; it is currently valid until the end of 2020.
The Neryungri mine operates the Tabornoe gold deposit and is the location for Nordgold’s pilot stage Gross project.
Neryungri produced 80.5 thousand ounces of gold in 2016.
Operating and Financial Highlights
|Run of mine (kt)||18,776||16,976||16,243||18,068||11,519||9,479||10,636|
|Waste mined (kt)||13,613||12,272||12,692||16,282||9,427||7,003||8,426|
|Ore mined (kt)||5,163||4,703||3,551||1,786||2,092||2,475||2,209|
|Stripping ratio (tn/tn)||2.64||2.61||3.57||9.12||4.5||2.8||3.8|
|Ore processed (kt)||4,742||4,211||3,848||2,891||3,084||2,622||2,201|
|Gold production (koz)||80.5||84.1||65.9||66.5||66.3||73.0||58.9|
|Gold sold (koz)||80.4||84.1||65.9||66.4||66.7||73.0||62.8|
|Average realised gold price per ounce sold (US$/oz)||1,284||1,145||1,255||1,348||1,671||1,617||1,266|
|Total Cash Cost (US$/oz)||481||553||721||1,017||767||611||555|
Tabornoe Deposit Ore Reserves and Mineral Resources Summary (31 December 2015)
|Category||Ore (Kt)||Grade (g/t)||Au (Koz)|
|Proven and Probable||48,636||0.74||1,164|
|Measured and Indicated||66,251||0.73||1,547|
Neryungri has a processing plant with crushing and heap leach extraction capabilities. Operations at Neryungri utilize the simplest heap leach extraction method available, due to the highly oxidized low-grade ore. Production at Neryungri is subject to significant seasonal variations due to harsh winter temperatures. The majority of crushing and stockpiling of ore occurs from May to September, and the majority of gold production occurs from July to December, as the cyanide spray used in heap leaching cannot penetrate frozen ore.
Milling and Classification
- To continue development of the Gross pit.
- The mine’s stripping ratio in 2017 is expected to increase due to waste stripping of the Tabornoe main pit.
- To start waste stripping at the Tomniy and Trench 7 deposits once relevant permits are granted.
- While the Gross mine is under construction drilling is planned on a systematic basis to increase confidence in the reserves to be mined and improve reconciliation during the mining phase.