Mumbai: India's foreign exchange reserves surged by $1.620 billion to $430.572 billion in the week to August 9 on rise in foreign currency assets , according to the latest RBI data released on Friday.In the previous reporting week ended on August 2, the reserves had declined by $697.2 million to $428.952 billion.In the reporting week, foreign currency assets, a major component of the overall reserves, increased by $15.2 million to $398.739 billion, the apex bank said on Friday.Expressed in dollar terms, foreign currency assets include the effect of appreciation/depreciation of non-US units like the euro, pound and yen held in the reserves.The country's gold reserves surged by $1.591 billion to $26.754 billion, according to data. Special drawing rights with the International Monetary Fund were up by $6.7 million to $1.441 billion.The country's reserve position with the fund rose by $7 million to $3.636 billion.