Of the six top gold importers, three are based out of Mumbai and the others have head offices in Bangalore, Haryana and Delhi.
Though there was no illegality involved in the imports by these six traders, the government, which is considering imposing fresh restrictions to curb surging gold imports that have cast a shadow on current account deficit, is examining the issue.
The six firms had imported 7.57 tons of gold in April, which shot up to 47.26 tons in September, sources said.
Interestingly, five state-owned trading houses accounted for just 6.4 per cent of the total gold imported in the country during the six months.
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India imported 95.6 tons of gold in September, more than double of 42.2 tons in April.
Sources said, the Finance Ministry is keeping a close watch on these six companies and is trying to ascertain whether they have engaged in any kind of hoarding of gold.
Gold import surged almost four times to USD 4.17 billion in October from USD 1.09 billion in the same month a year ago. In volume terms, gold imports have touched 150 tonnes in October against 24 tonnes during the same period a year ago.
The high imports have pushed up the country's trade deficit to USD 13.35 billion as against USD 10.59 billion in October 2013.
The CAD, which had touched a record high of USD 88.2 billion or 4.8 per cent of GDP in 2012-13 is estimated to have come down to below USD 32.4 billion or 1.7 per cent of GDP in 2013-14.
The RBI in August last year had imposed restrictions on gold imports and raised import duty on the precious metal to 10 per cent to check burgeoning current account deficit and sliding rupee.
While the steps by RBI helped lower gold imports substantially, they also increased instances of smuggling.
In May, the previous UPA government eased certain rules and allowed private agencies to import gold under 80:20 scheme. This facility was available to select banks only and other entities were barred from importing the metal.