Gold’s rally is spurring investor interest with volume on the biggest futures exchange rocketing. With prices set for the best month in four years, trading on the Comex is poised for the strongest-ever February. Aggregated volumes on the New York futures exchange rose 54 percent from the same month a year ago to about 4 million contracts with one trading day left. “Volatility in prices has boosted turnover on the paper market but at the same time it has killed interest in the physical market where investors are waiting to see if prices will come back down,” said Neil Meader, an analyst at Metals Focus Ltd.