Directory of Gems - Gem Dictionary - reference guide to Turquoise
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Turquoise was among the first gems to be mined. Many historic sites have been depleted but some are still worked to this day. These are all small-scale, often seasonal operations, owing to the limited scope and remoteness of the deposits. Most are worked by hand with little or no mechanization. However, turquoise is often recovered as a byproduct of large-scale copper mining operations.
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