New purchase's total reserves are put at 2.2 billion tonnes of coking coal, and around 50 billion cubic metres of methane gas.
Men reunited with their families after successful operation to free them after fears of gas leaks and more rock falls.
New technology to be tested on heating stations in eastern Russia.
The problem was between Ksenyevskaya and Kisliy Klyuch in the Trans Baikal region.
Total of 140,000 tonnes is on its way from Siberia thanks to cooperation between the two warring nations.
A methane explosion ripped through the pit in Kemerovo region - but 101 safely escaped to the surface.
The coal miners are in hospital after the explosion at Gramoteinskaya pit near town of Belovo in Kemerovo region.
As much as two billion tonnes can be extracted from open-cast site over the next 167 years with hopes it can transform rural region.
Two men died but miraculously more than 100 reach the surface safely.