Core Viewpoint - Cleveland-Cliffs shares increased nearly 19% in premarket trading following the company's report of strong demand for its US-produced steel and its plans to explore opportunities in rare-earth materials [1] Group 1: Company Performance - Cleveland-Cliffs reported strong demand for its US-produced steel, contributing to the significant rise in its stock price [1] Group 2: Future Opportunities - The company revealed plans to explore opportunities in the rare-earth materials sector, indicating a strategic expansion beyond its traditional steel business [1]