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fine metal
The higher grades of copper regulus or matte obtained in the English process of copper smelting. Included are the following four varieties, which are distinguished by appearance and copper content: (1) blue, containing about 60% copper; (2) sparkle, about 74% copper; (3) white, about 77% copper; and (4) pimple, about 79% copper.
- 词性: noun
- 行业/领域: 采矿
- 类别 一般矿业; Mineral mining
- Government Agency: USBM
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创建者
- ed.young
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(Milwaukee, United States)