One explosion, which killed one and injured six miners, occurred Friday night in Prokopievsk, near the regional center of Kemerovo.
Itar-Tass said engineers conducting a planned blast to expose coal deposits committed "gross violations" of safety by not checking the amount of methane and keeping workers around the site.
In the second incident Saturday morning, a mine expert caused a methane explosion when he decided to destroy some outdated explosive materials by a blast, it said. The underground blast in Kiselyovsk, also near Kemerovo, killed one and injured two people.
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