The major use of terbium is in compact fluorescent light bulbs (the other main one is in phosphors for TV screens).

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The concentration of terbium is probably lower than it is in the ore that we get it from in the first place.

FORBES: The EU Wastes 99% of its High Tech Metals

Terbium, why the very low recycling rate even with the high value?

FORBES: The EU Wastes 99% of its High Tech Metals

They seem to be saying that terbium should have run out last year: so that means no more compact fluorescent light bulbs ever.

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The world uses a few tonnes of terbium a year.

FORBES: It's 2013: Let's Check Those New Scientist Claims About Running Out Of Terbium And Hafnium

The property is rich in neodymium, dysprosium and terbium.

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And terbium and hafnium are produced as byproducts.

FORBES: It's 2013: Let's Check Those New Scientist Claims About Running Out Of Terbium And Hafnium

But no actual terbium reserves.

FORBES: It's 2013: Let's Check Those New Scientist Claims About Running Out Of Terbium And Hafnium