Mumbai, April 16 -- The dollar index extends deep loses to hit a fresh 3-year low on Wednesday amid mounting concerns over the economic fallout from potential new U.S. tariffs. President Donald Trump ordered a new investigation into potential tariffs on all critical mineral imports-many of which the U.S. sources from China. The dollar index that measures the greenback against a basket of currencies is quoting at 99.31, down 0.65% on the day. Among basket currencies, EURUSD and GBPUSD are both gaining good momentum at $1.1420 and $1.3278 respectively with euro adding sharp gains of close to 1% on the day. Investors await Fed chair Powell's speech and retail sales data due later in the global day. On the U.S. economic front, the Labor Depar...