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Makivik Magazine Issue 97

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s/C5n/k5. s/C5n/ Promethium<br />

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WbcD8ânstQ§a7mî4.<br />

darren smith<br />

sIC8ix[5nys3†5 w9lnzi4 nNJ5.<br />

Building the base camp for prospectors.<br />

Rare Earths are used in a variety of high tech and green technologies<br />

including wind turbines, cell phones, magnets, motors, flat panel<br />

displays, and phosphors, etc. What makes rare earths so valuable is there<br />

are essentially no suitable substitutes for them in many applications.<br />

Efficiency or practicality is always sacrificed when a substitute is used.<br />

Recently the US Department of Energy outlined the five rare earth<br />

elements that are the most “critical” to clean and high tech industries.<br />

“Critical” is the term used to indicate a commodity that is in the greatest<br />

demand while being in the shortest supply in the long term, with<br />

the added aspect that substitutes for it are hard or impossible to find.<br />

These are Neodymium, Europium, Terbium, Dysprosium, and Yttrium.<br />

Neodymium is the main component of high strength “super magnets”,<br />

required for all types of motors and related applications (such as wind<br />

turbines, electric vehicles, cell phones). Dysprosium is critical for these<br />

magnets as it allows for use at high temperatures without compromising<br />

magnetic strength. Terbium may substitute for Dysprosium in certain<br />

applications and is used in green phosphors. Europium and Yttrium are<br />

used as phosphors, essential to produce colours in screen displays such<br />

as flat screen televisions and cell phones, as well as in various lighting<br />

applications. Europium is required for producing the red colour in screen<br />

displays with no known substitutes, thus demanding one of the highest<br />

prices of all rare earth oxides. Deposits enriched in these five critical<br />

elements, in addition to significant total rare earth oxide grade, are generally<br />

thought to have the better chance of making it to production. It is<br />

estimated that only five or six new mines outside of China are needed<br />

to satisfy future demand.<br />

Often, the term “rare earth distribution” is used to partially evaluate<br />

a rare earth deposit’s economic potential. It refers to the relative quantity<br />

of each rare earth expressed as a percentage of the total quantity<br />

of all the rare earths. Deposits with higher distribution percentages of<br />

the critical rare earth elements are typically considered the most valuable,<br />

although grade, tonnage, and location are always essential factors.<br />

Rare earth deposits may occur in a variety of geological environments<br />

but most predominantly in carbonatites such as Ashram<br />

(Nunavik), Mountain Pass (California), and Bear Lodge (Wyoming)<br />

deposits; intensely weathered carbonatites, also called laterites, such<br />

as Mount Weld (Australia) and Zandkopsdrift (South Africa) deposits;<br />

MAKIVIK mag a zine<br />

13

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