THE country’s foreign exchange reserves surged by a massive USD 6.47 billion to touch an all-time high of USD 513.25 billion in the week ended July 3, the latest data from the Reserve Bank of India (RBI) showed. In the previous week ended Jun 26, the reserves had increased by USD 1.27 billion to USD 506.84 billion. The reserves had crossed the half-a-trillion dollar mark for the first time in the week ended June 5 after it had increased USD 8.22 billion and reached USD 501.70 billion.