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Excerpt (page 6):
4. Investor interest
Investor interest in REE remains substantial after the correction and many projects being planned in 2010 remain active. Over 50 deposits are in advanced stages of development (Technology Metals Research, 2015). Examples of active REE projects include Mountain Pass, Bear Lodge, Bokan Mountain, Round Top, Ngulla, Browns Range, Kvanefjeld and Ashram. The REE industry remains highly fluid and is prone to disruption by technological advancement, which is less common in more established markets. As a highly complex set of chemical products with distinct uses and markets, project viability assessment is more complex for REE than for many other materials. Some of the parameters critical to understanding economic viability are: proprietary or licensed processing technologies; the relative proportion of each rare earth in a deposit and thus projected rare earth basket prices; overall grade; and mineralogy (Bogner, 2014; Hatch, 2010).
Bogner, S., 2014. The Knock-Out Criteria for Rare Earth Element Deposits: Cutting the Wheat from the Chaff. Rockstone Research Ltd.