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    Mountain pass - Wikipedia

    Overview

    Mountain passes make use of a gap, saddle, col or notch. A topographic saddle is analogous to the mathematical concept of a saddle surface, with a saddle point marking the minimum high point between two valleys an… See more

    Synonyms

    There are many words for pass in the English-speaking world. In the United States, pass is very common in the West, the word gap is common in the southern Appalachians, notch in parts of New England, … See more

    Around the world

    There are thousands of named passes around the world, some of which are well-known, such as the Khyber Pass close to the present-day Afghanistan-Pakistan border on the ancient Silk Road, the Great St. Bernard Pass at … See more

    Is mountain pass a rare earth source?
    With one of the world’s highest quality deposits and more than 7% rare earth content, Mountain Pass became the primary global source from the 1960s to the 1990s. More recently, China established a dominant position across the entire rare earth supply chain, and rare earth mining, processing and magnet production largely ceased in the United States.
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