Mining conglomerate Vedanta Resources plunged into a $217 million loss for the six months ended September amid lower metal prices and currency losses.The London-listed company had reported a profit of $173.6 million in the corresponding period of 2012-13.“Profit before tax was significantly impacted by other gains and losses mainly due to higher rupee depreciation resulting in mark to market foreign exchange losses of $429 million,” Vedanta said on Friday. Core profit, or Ebitda declined 14% to $2.207 billion from $2.571 billion a year earlier.