Siana Gold is a mining project of Greenstone Resources Corporation located at Surigao Del Norte. The project site currently has four (4) existing tailings storage facilities, three (3) of them were built about 20 years ago while the other one was built during the recent mine redevelopment. On the 2nd quarter of 2013, Siana Gold engaged Knight Piesold Pty Ltd. (KPPL) to oversee stabilization works and subsequently, design new tailings storage facilities. KPPL commissioned AMH to carry out parallel analysis and review for the Interim Tailings Storage System. The assessment and review covers hydrology, hydraulics, geology and geotechnical engineering.