This survey has been designed to identify, asses and analyze critical resources for renewable energy production from a lifecycle perspective. In the years 2016 - 2020, Vattenfall is implementing a comprehensive expansion of renewable energy. The goal is to have a renewable energy capacity of at least 2300 MW by 2020. The majority of the new capacity will be wind power. This work provides a basis for further decision making on closer cooperation or dialogue with suppliers. This study was demarcated to wind power and its input minerals. Six minerals were selected for the survey, iron, copper, tin, aluminum, neodymium and lead. The selected minerals were examined for resource efficiency and environmental impact. The survey was then compiled in a table, using a weighted sum model to yield a quantitative result. The work also provides suggestions on how to achieve better resource efficiency for the planned expansion. The survey found that tin was a very critical resource, considering both resource efficiency and environmental impact. Aluminum and copper were the most critical for environmental reasons.