Is there a risk for Lake Storsjön to be contaminated?

No. Before a mine can be opened, extensive environmental investigations are required. Potential impacts on surface water, groundwater, and waste management are key issues that legally must be addressed with protective measures before an environmental permit to open a mine could be issued. If the activity is deemed not to meet the requirements of the environmental code or the minerals act, then no permit will be granted. The same applies when a possible mine is in operation, discharge levels in water are measured regularly and reported to the supervisory authority (Swedish Agency for Marine and Water Management) to ensure that the regulated conditions set in the environmental permit are fulfilled.