▁min er als ▁in ▁Turkey , ▁which ▁poss esses ▁ 7 2 % ▁of ▁the ▁world ' s ▁known ▁depos its . ▁In ▁ 2 0 1 2 , ▁it ▁held ▁a ▁ 4 7 % ▁share ▁of ▁production ▁of ▁global ▁bor ate ▁min er als , ▁ahead ▁of ▁its ▁main ▁compet itor , ▁Rio ▁T into ▁Group . ▁ ▁Al most ▁a ▁quarter ▁( 2 3 %) ▁of ▁global ▁bor on ▁production ▁comes ▁from ▁the ▁single ▁Rio ▁T into ▁Bor ax ▁Mine ▁( also ▁known ▁as ▁the ▁U . S . ▁Bor ax ▁Bor on ▁Mine ) ▁ ▁near ▁Bor on , ▁California . ▁ ▁Market ▁tr end ▁The ▁average ▁cost ▁of ▁cry st all ine ▁bor on ▁is ▁$ 5 / g . ▁Free ▁bor on ▁is ▁chief ly ▁used ▁in ▁making ▁bor on ▁fib ers , ▁where ▁it ▁is ▁depos ited ▁by ▁chemical ▁v apor ▁de position ▁on ▁a ▁t ung sten ▁core ▁( see ▁below ). ▁Bor on ▁fib ers ▁are ▁used ▁in ▁light weight ▁composite ▁applications , ▁such ▁as ▁high ▁strength ▁t apes . ▁This ▁use ▁is ▁a ▁very ▁small ▁fraction ▁of ▁total ▁bor on ▁use . ▁Bor on ▁is ▁introduced ▁into ▁sem icon duct ors ▁as ▁bor on ▁comp ounds , ▁by ▁ion ▁impl ant ation . ▁ ▁Est im ated ▁global ▁consumption ▁of ▁bor on ▁( al most ▁entirely ▁as ▁bor on ▁comp ounds ) ▁was ▁about ▁ 4   mill ion ▁t onnes ▁of ▁B 2 O 3 ▁in ▁ 2 0 1 2 .