Dysprosium and Terbium Here's the links to more information about the two main rare Earth elements at Bokan:
https://en.wikipedia.org/wiki/Dysprosium
"Neodymium-iron-boron magnets can have up to 6% of the neodymium substituted with dysprosium[22] to raise the coercivity for demanding applications such as drive motors for hybrid electric vehicles. This substitution would require up to 100 grams of dysprosium per hybrid car produced. Based on Toyota's projected 2 million units per year, the use of dysprosium in applications such as this would quickly exhaust the available supply of the metal."
https://en.wikipedia.org/wiki/Terbium
"Terbium is used to dopecalcium fluoride, calcium tungstate and strontiummolybdate, materials that are used in solid-state devices, and as a crystal stabilizer of fuel cells which operate at elevated temperatures. As a component of Terfenol-D (an alloy that expands and contracts when exposed to magnetic fields more than any other alloy), terbium is of use in actuators, in naval sonar systems and in sensors."