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Open-File Report 2013–1008

A Preliminary Deposit Model for Lithium-Cesium-Tantalum (LCT) Pegmatites

By Dwight Bradley and Andrew McCauley

Thumbnail of and link to report PDF (858 kB)Abstract

This report is part of an effort by the U.S. Geological Survey to update existing mineral deposit models and to develop new ones. We emphasize practical aspects of pegmatite geology that might directly or indirectly help in exploration for lithium-cesium-tantalum (LCT) pegmatites, or for assessing regions for pegmatite-related mineral resource potential. These deposits are an important link in the world’s supply chain of rare and strategic elements, accounting for about one-third of world lithium production, most of the tantalum, and all of the cesium.

First posted February 1, 2013

Revised December 20, 2016

For additional information contact:
Director, Central Mineral and Environmental Resources Science Center
U.S. Geological Survey
Box 25046, Mail Stop 973
Denver, CO 80225

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Suggested citation:

Bradley, Dwight, and McCauley, Andrew, 2013, A preliminary deposit model for lithium-cesium-tantalum (LCT) pegmatites (ver. 1.1, December 2016): U.S. Geological Survey Open-File Report 2013–1008, 7 p.,



Nomenclature, Related Deposit Types, and Examples

Global, Regional, and Temporal Context

Relationships to Igneous Rocks

Size, Structure, and Mineralogy of Deposits

Geologic Assessment Guidelines

References Cited

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