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美国菲尔普斯道奇公司以铜市场不景气为由宣布，谢里塔(Sierrita)和巴格达德(Bagdad)的两矿山(都在亚利桑那州)从2002年1月中旬开工率降为50%。这样从副产品硫化钨精矿中回收铼的供应恐怕会不足。谢里塔的钼精矿2000年实际生产钼9988t，估计巴格达德为317t，考察最近开工率低下
The United States Phelps Dodge Company announced that the mines in Sierrita and Bagdad (both in Arizona) had been reduced to 50% from the mid-January of 2002 due to the copper market downturn. Thus, the recovery of thorium from the by-product tungsten sulphide concentrate may not be sufficient. Sherida’s molybdenum concentrate actually produced 9,988 tons of molybdenum in 2000, and estimated 317 tons of Baghdad.