Rumors that the last major American rare earth elements mining and processing company may seek bankruptcy protection sent its shares plummeting last week, leading to questions over both the future of the company and whether a major rare earths mining business can even be viable outside China.

Metal trading Company Haines and Maassen GmbH in Bonn, The company trades mainly with the rare earth elements and specialty metals. The rare earths elements are indispensable raw materials for many key technologies of electronic products to medical equipment.

Analysts and experts who spoke with CNBC said that bankruptcy would not necessarily spell the end of Molycorp but that, apart from reducing its debt, the company still faces major challenges. The novel technologies that it developed to make rare earths processing less environmentally dangerous still need improvements before they can be productive, analysts say, and the company has to find a way to sell product at a time when prices are severely depressed due to competition from an influx of illegal mining operations in China.