In depth
By mid-1991 India’s foreign exchange reserves had fallen sharply. Wikipedia reports reserves of about US$1.2 billion in January 1991, roughly halved by June. The Reserve Bank of India’s own research paper describes a gold sale with repurchase option to the Union Bank of Switzerland in April 1991, then a pledge of 46.91 tonnes of gold to the Bank of England and Bank of Japan in July 1991.
These sources do not fully agree. Wikipedia places an airlift of 47 tonnes to the Bank of England and 20 tonnes to UBS in May 1991 under the Chandra Shekhar government, while the RBI paper dates the pledge to July, after the change of government. This entry therefore lists the April transaction, which fell within the Chandra Shekhar government according to the RBI paper, and treats the July pledge as context.
Neither source gives a full reconciliation of the totals, and the RBI chapter was not opened in full for this entry. Confidence is accordingly low. The wider reform response is covered in the separate entry on the 1991 industrial policy.