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Цайр нь хэд хэдэн чухал хайлшийг үүсгэдэг. Эдгээрийн дотор зэс, цайрын хайлш нь зэс юм. Бараг бүх цайрын цайр (95%) цайрын сульфидын хүдрээс гардаг. Цайрыг дахин боловсруулж, жил бүр үйлдвэрлэдэг цайрын 30% нь дахин боловсруулсан металл юм. Цайр бол дэлхийн царцдасын хамгийн элбэг тохиолддог элемент юм .
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