阴郁
发表于 2025-3-23 12:29:35
Nickel (-Copper) Sulfide Deposits,ng nickel steels and nickel cast irons. It is also used for many other alloys, especially with copper (Monel metal) and chromium (stainless steel). Nickel imparts to its alloys toughness, strength, and anti-corrosion qualities; nickel steels and alloys are preferred for moving and wearing parts of m
漫步
发表于 2025-3-23 15:49:02
Platinum-Group Element (PGE) Deposits,, ruthenium (Ru), rhodium (Rh), platinum (Pt), and palladium (Pd). Based on association, the PGE may be divided into two subgroups: the Ir-subgroup (IPGE) consisting of Os, Ir, and Ru and the Pd-subgroup (PPGE) consisting of Rh, Pt, and Pd.
malign
发表于 2025-3-23 19:09:56
Porphyry Deposits,phyritic igneous intrusions. With the development of large-scale open-pit mining methods and froth flotation techniques for efficient beneficiation of low-grade ores, the meaning of the term has been expanded to include economic considerations as well as engineering characteristics. It now refers to
懒惰民族
发表于 2025-3-24 01:53:27
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耕种
发表于 2025-3-24 03:55:52
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淡紫色花
发表于 2025-3-24 07:54:38
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谆谆教诲
发表于 2025-3-24 10:52:52
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雀斑
发表于 2025-3-24 18:31:19
Mississippi Valley-Type (MVT) Zinc-Lead Deposits,ny such deposits within the drainage basin of the Mississippi River in the central United States, where they were first studied in detail. MVT deposits contain a substantial proportion of the world’s reserves of zinc and lead. They are the main source of these metals in the United States and contrib
聋子
发表于 2025-3-24 20:51:00
Uranium Deposits, at Joachinstal, Bohemia (Joachimsthal, former Czechoslovakia). The first important sources of radium outside Czechoslovakia were the sandstone-hosted uranium-vanadium deposits of Colorado and Utah (USA) from which about 275,000 tons of ore were produced during 1898–1923. This ore yielded about 200
Supplement
发表于 2025-3-25 02:21:40
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