At Mountain Pass, unique geological and chemical forces combined to form rare and valuable deposits.

Rare Earth Operations
The Mountain Pass mine is one of the limited locations where a fortuitous combination of forces has brought the Lanthanides together in a bountiful concentration. The Precambrian Bastnasite ore deposit at Mountain Pass is 250 feet thick, has a strike length of 2300 feet, and dips into the ground at a 40 degree angle.

The Mountain Pass Lanthanide ore deposit contains about 40% calcite, 25% barite, 10% strontianite, 12% Bastnasite, 8% silica and minor amounts of other minerals. This mineral Bastnasite contains seven lanthanides that are either concentrated or recovered at Mountain Pass, although others are present.

For more information on each phase of our operations please click on the links at left.
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