Mayskoye

Long-life high-grade refractory gold mine with 3 Moz in additional resources

Quick facts

Location Chukotka, Russia
Ownership 100%
Operating mines Mayskoye
Key exploration projects Deeper levels
Mining open-pit/underground
Processing 850 Ktpa flotation plant, third-party offtake/Amursk POX
Reserves (JORC) 1.9 Moz GE, 7.4 g/t average grade
Resources (JORC) 3.1 Moz GE, 9.3 g/t average grade
Production start date 2013
Life of mine 2035
Employees 996
Key highlights 2021

Overview

Mayskoye is a high-grade refractory gold deposit that was acquired by Polymetal in 2009 to form the Amursk Hub project. Mayskoye comprises of an underground mine that has been operational since 2010, an open-pit that has been operational since 2016, and a 850 Ktpa on-site flotation concentrator that was launched in 2013.

The operation primarily produces gold concentrate via conventional floatation which is then shipped to third party off-takers or the Amursk POX plant for further processing into gold dore bars.

In 2016, Polymetal initiated a project to extract crown pillars from zones 1 and 2 via open-pit mining. The open-pit delivers oxide and transitional ores that will be processed through the retrofitted on-site processing plant, which includes new cyanide leaching tanks and a tailing detox.

Location History Geology and Mineralisation Operations Reserves and Resources Exploration

Mayskoe is located in North-Eastern Russia, in the Chaun distrct of the Chukotka Autonomous Region, in a remote unpopulated area covered by Arctic tundra. The deposit is accessible all-year round via 187 km of improved unpaved roads from the town of Pevek (population of 4,000), which also happens to be a major seaport, and holds a local airport that is capable of accommodating a variety of commercial aircrafts. Spare parts and other supplies are delivered through the port of Pevek, from July to early November each year.

Location

Mayskoye was first discovered in 1972 and was extensively explored between 1974 and 1986, mostly by surface diamond drilling. The deposit was the subject of several statutory feasibility studies conducted by both the Soviet Union and Russia. In 2004, Highland Gold acquired the licence for the deposit through a public auction, and by 2008, substantial infrastructure was built on site, including road access and accommodation. In the same year, a feasibility study was completed by Aker Kvaerner and the development of the underground mine commenced in the first quarter of 2008.

The Group acquired the property from Highland Gold in 2009 and incorporated Mayskoye into the Amursk POX hub in order to reduce capital costs necessary for the construction of a stand-alone processing plant. Construction of the Mayskoye concentrator began in 2010 and it was commissioned in 2012.

Gold mineralisation at Mayskoye is of the medium-sulphide, gold-pyrite-arsenopyrite type and is mostly associated with the steep quartz-feldspar dykes. Economic gold mineralisation is confined to high-grade gold-quartz-sulfide veins. Only 46 of more than 300 veins were subject to gold resource assessment, which were grouped into six mineralised zones to prioritise further mining operation scheduling. The average ore body width is 0.8 to 5.2 m and the zone of oxidation can be traced to a depth of 300 m. Gold in the oxidized zone can be found both in free and sulphide-associated forms.

Flowcharts

Ore Reserves Tonnage, Mt Gold grade, g/t Silver grade, g/t Copper grade, % GE grade, g/t Gold, Koz Silver, Moz Copper, Kt GE, Koz
Total 8.0 7.4 - - 7.4 1,929 - - 1,929
Mineral Resources Tonnage, Mt Gold grade, g/t Silver grade, g/t Copper grade, % GE grade, g/t Gold, Koz Silver, Moz Copper, Kt GE, Koz
Total 10.6 9.3 - - 9.3 3,166 - - 3,166
  • At Mayskoye, Ore Reserves and Mineral Resources were revaluated assuming changes in cut-off grade and better recovery rate. Ore Reserves increased by 103 Koz to 1.9 Moz with an average grade of 7.4 g/t; additional Mineral Resources added 382 Koz to reach 3.2 Moz with an average grade of 9.3 g/t.
  • No exploration is expected in 2022.

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2019