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Belonging to the Dharwarian System, the series has been named after the Champion reef in the Kolar Gold fields. Lying to the north-east of Mysore City and to the east of Bangalore, this series stretches in the Kolar and Raichur districts of Karnataka. Its gold mines are one of the deepest in the world, being more than 3.5 km in depth. The gold content in this series is about 5.5 grams per tonne of ore.