Oil and Natural Gas has surrendered an onshore block awarded to it some decade-and-a-half ago in West Bengal, saying the project was not commercially viable. According to a report published in The Economic Times ONGC, which relinquished two coal bed methane blocks earlier this year , said it had dug three wells in the 622-sq-km Contai block, which was awarded on a nomination basis before the New Exploration Licensing Policy was formulated.
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