Jan 17 (Reuters) - Turquoise Hill Resources said that Oyu Tolgoi, a copper and gold mine in the southern Gobi Desert, has declared force majeure in connection with customer contracts for concentrate ...
The lack of a grading system for the popular stone has prompted a father-son team to spend the last five years working on one. Turquoise stones from the blue and green master sets at the Turquoise ...
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