Mumbai, May 13 -- COMEX copper futures continue to struggle near $4.6 mark as dollar bounced higher on de-escalating US China trade tensions. A stronger U.S. dollar typically has an inverse relationship with copper prices. However, positive cues from equities are seen limiting downside in the red metal. The rally on Wall Street came following news of a U.S.-China trade deal that drastically reduces the massive tariffs on each other's goods. The Nasdaq soared 779.43 points or 4.4 percent to 18,708.34, the S&P 500 spiked 184.28 points or 3.3 percent to 5,844.19 and the Dow surged 1,160.72 points or 2.8 percent to 42,420.10. Currently, copper futures are quoting at $4.61 per pound, down 0.18% on the day. On the MCX, copper is trading around Rs...