First quarter earnings reports of Adaro Energy, Indonesia's second-largest thermal coal producer, and Harum Energy, also a leading thermal coal producer, surpassed expectations of investors, and led to the 0.88 percent gain of the mining sector on the stock market on Tuesday.

Several mining shares that surged on today's trading day were those of Adaro Energy (+2.93 percent), Indo Tambangraya Megah (+3.45 percent), Bukit Asam (+2.22 percent).

Meanwhile, the Indonesian rupiah exchange rate depreciated 0.13 percent to IDR 11,538 per US dollar based on the Bloomberg Dollar Index. Bank Indonesia's benchmark rupiah rate (Jakarta Interbank Spot Dollar Rate, abbreviated JISDOR), however, appreciated 0.09 percent to IDR 11,525 per US dollar on Tuesday (13/05).

| Source: Bank Indonesia