Mumbai, March 8 -- COMEX copper futures zoomed above $4.70 per ounce mark, spiking as U.S. President Donald Trump suggested imports of the metal could be subject to a 25% tariff. Trump had announced that the Commerce Department would undertake a sweeping investigation that could lead to levies on copper on national security grounds. Falling inventories and weak US dollar index -which tested near four month low also supported the red metal which is up around 3.60% this month after soaring more than 6% in February. Meanwhile, China's unwrought copper imports dropped by 7.2% year-on-year to 837,000 metric tons in the first two months of 2025, customs data on Friday showed, due to increased domestic smelting capacity that reduced the need for a...