Ridder (Russian: Риддер, romanized: Rıdder), formerly known as Leninogorsk (Russian: Лениногорск) is a city in the East Kazakhstan Region in north-eastern Kazakhstan. Its population is approximately 50,500 (2009 Census results). The city is situated in the south-western Altai Mountains and north-east of the region's capital, Oskemen, along the Ulba River, at an elevation higher than 700 metres. The fact that Altai Krai is rich in natural deposits was discovered during Empress Catherine the Great's reign. The history of Ridder started in 1786 when 9 troops of men were sent to the Altai region to search for natural resource deposits. One of these troops was headed by an officer, Philip Ridder. On May 31, 1786, he found a very rich deposit containing gold, silver and other metals. More information...

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