We would like to thank for Budi Arifianto for his letter Tailing's Dark Side published in TEMPO's February 19 edition.

Regarding his question about tailing, even though PT Newmont Nusa Tenggara (PT NNT)'s waste disposal pipe has been designed to last 10 to 20 years—after the first leak that released about 200 liters of tailing—the potential for a leak happening on several segments of ground pipes can be detected through a physical inspe