The Sierra Club had stressed, not the possibility that some proposal on this region was under contemplation, but rather the inter-related environmental impacts of individual mining operations in this region. 賽拉俱樂部強調說,需要思考的不是涉及該地區的提案是否有可能存在,而是與在該地區某一單個採礦作業有內在聯繫的環境影響。