Deposit

General information about the deposit

Video presentation of Udokan deposit, SRK Consulting


Udokan copper deposit with resources of more than 26 mn tons of copper is the largest in Russia and one of the largest copper deposits in the world. The deposit is located in Kalar District of Zabaikalye Region, 30 km away from Novaya Chara railway station of Baikal-Amur Mainline.

Ore body outcrops

Ore body outcrops

Geology and ore body

Udokan deposit is a stratiform copper deposit embedded in metamorphosed sedimentary rocks. Copper mineralization is confined to quartz-carbonate sandstone of Lower-Proterozoic Upper Subsuite of Sakukan Formation.
Copper mineralization makes up a continuous stratiform horizon formed into a synclinal fold together with the host rocks. The fold`s length is 9 km, its width is from 2.8 to 4 km. Mineralization is represented by oxide and sulphide minerals complexly alternated in the ore mass. The ores are mixed all over the deposit. There are higher concentrations of oxide ores near the surface along fissures and faults.

Exploratory well core in BMC LLC core storage

Exploratory well core in BMC LLC core storage

Resource base

BMC LLC has performed a considerable scope of work related to resource base confirmation and update since obtaining the license.

While honouring the license commitments, activities on geological and economic survey of the deposit were completed. In the course of geological exploration program of 2010-2014 about 75,000 m of geological, geomechanical and hydrogeological boreholes were drilled, approximately 1,240 m of confirmatory trenches were sampled and about 2,500 m of underground workings were resampled. As a result, more than 18,000 channel and core samples were taken for analysis.

The resource base of the deposit was updated as geological exploration works advanced. As of March 2014, JORC-compliant Mineral Resources amounted to:

Ore           
Reserves
Ore 
(Mt)
Copper  
grade,  
%
Silver   
grade,   
g/t
Contained   
copper   
(Mt)
Contained  
silver            
(Moz)
Measured
339 1,03 8,9 3,5 97
Indicated
1483 1,01 11,1 14,9 531
Measured + 
Indicated
1822 1,01 10,7 18,4 628
Inferred
932 0,89 14,3 8,3 428
Total 2754 0,97 11,9 26,7 1056


As of April 2014, JORC-compliant Ore Reserves of Udokan copper deposit equated to:

Ore
reserves
Ore 
(Mt) 

Copper  
grade,  
%
Silver   
grade,   
g/t
Contained   
copper   
(Mt)
Contained   
silver            
(Moz)   
Proven
292 1,04 8,9 3,1 83,4
Probable
1147,5 1,05 11,2 12,0 414,3
Total 1439,5 1,05 10,8 15,1 497,7


The State Committee approved the estimation of copper, associated components and mineral reserves of Udokan deposit based on the results of the state experts review. The reserves estimation was prepared in accordance with the exploration conditions approved in 2015 and within the timeframes specified in the License.

According to the estimation`s data, economic reserves of categories В+С1 amount to 16.864 mt of copper; of category С2 - to 3.232 mt of copper and 17.119 kt of silver; sub-economic reserves of categories С1+С2 comprise 0.953 mt of copper and 1.012 kt of silver. The resource potential of Udokan deposit is estimated at more than 27 mt of copper.