Abstract
The NYKOS project aimed at addressing some of the main knowledge gaps on the environmental impacts of submarine tailing disposal (STD) to facilitate the development of techniques, practices and management measures that will minimize such impact. Here, we report on the main issues addressed by the different research groups within NYKOS, the results obtained during the project and how this new knowledge can be used by the authorities to develop guidelines for best available techniques related to STDs in Norwegian fjords.