CHRONOLOGY: Coal mine disasters in Russia

(Reuters) - Rescuers on Tuesday found one survivor in a Siberian coal mine, after a gas explosion killed at least 106 in Russia's worst mining disaster for over a decade.

Smoke, pockets of gas and collapsed roofs were hampering rescue efforts at the Ulyanovskaya mine in the region of Kemerovo, officials said.

Following is a chronology of major disasters at Russian coal mines in the last 10 years:

December 1997 - A methane gas explosion rips through the Zyryanovskaya mine in the city of Novokuznetsk in western Siberia, killing more than 30 miners.

January 1998 - A powerful explosion at the Tsentralnaya mine in the Arctic town of Vorkuta kills 27 miners.

January 13, 2002 - At least five people die in a methane gas blast at the Vorkutinskaya mine in the northern Komi Republic.

October 29, 2003 - Five miners are killed in a methane blast at a mine in the Far Eastern town of Partizansk.

April 10, 2004 - A gas explosion at the Taizhina colliery in Siberia's Kemerovo region kills 45.

October 28, 2004 - A methane blast at the Listvyazhnaya mine in Siberia kills at least 13.

February 9, 2005 - An explosion in the Yesaulskaya mine in Kemerovo kills 21.

September 8, 2005 - A methane blast at Anzhero-Sudzhensk in Kemerovo region kills three.

September 7, 2006 - Twenty-five miners die in a fire at a remote gold mine in Eastern Siberia near the border with China.

February 25, 2007 - One miner is killed after part of a shaft collapses at a coal mine in Kemerovo region.

March 1, 2007 - One coal miner is killed and nine are injured after part of a shaft collapses in Kemerovo region.

March 19, 2007 - A gas explosion at the Ulyanovskaya mine in Kemerovo region kills 106 people. Four others remain missing. The mine, in Siberia's Kuznetsk basin, or Kuzbass, holds some of the biggest coal reserves in the world.