A Moscow-based aviation committee, citing the surviving crew, said 19 of the 28 people on board were killed, but the emergencies ministry refused to confirm the toll.
The ministry said rescue teams were having a hard time reaching the crash site in the mountainous woods of the northern Yakutia region, with efforts hampered by bad weather.
"There were three crew members and 25 passengers on board," the Interstate Aviation Committee said in a statement. "Nineteen people died, the aircraft burnt down."
The accident apparently happened when the Polar Airlines helicopter performed a hard landing in poor weather, 45 kilometres (28 miles) northwest of the small town of Deputatsky in Yakutia.
The first deputy head of the Interstate Aviation Committee, Alexander Filatov, told AFP he had been notified of the death toll through a telegram from aviation officials in Yakutia, who were able to communicate with the crew after the crash.
But a spokeswoman for the emergencies ministry, Irina Rossius, said she could not give a toll until some of the 240 rescuers and eight aircraft dispatched to the area find the helicopter and victims.
A spokesman for the regional government in Yakutia, Afanasy Yegorov, said the crash site was so difficult to reach that the rescue teams had to land their aircraft some 30 kilometres (18 miles) away and continue their journey using all-terrain vehicles.
He too declined to give casualty figures.
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