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| TABLE 2 | ||||||||||||
| RARE EARTH CONTENTS OF MAJOR AND POTENTIAL SOURCE MINERALS1 | ||||||||||||
| (Percentage of total rare-earth oxide) | ||||||||||||
| Bastn�site | Monazite | |||||||||||
| Mountain Pass, | Bayan Obo, Inner | North Capel, | North Stradbroke Island, | Green Cove Springs, | Nangang, | |||||||
| Rare earth | CA, United States2 | Mongolia, China3 | Western Australia4 | Queensland, Australia5 | FL, United States6 | Guangdong, China7 | ||||||
| Cerium | 49.10 | 50.00 | 46.00 | 45.80 | 43.70 | 42.70 | ||||||
| Dysprosium | trace | 0.1 | 0.7 | 0.60 | 0.9 | 0.8 | ||||||
| Erbium | trace | trace | 0.2 | 0.2 | trace | 0.3 | ||||||
| Europium | 0.1 | 0.2 | 0.053 | 0.8 | 0.16 | 0.1 | ||||||
| Gadolinium | 0.2 | 0.7 | 1.49 | 1.80 | 6.60 | 2.00 | ||||||
| Holmium | trace | trace | 0.053 | 0.1 | 0.11 | 0.12 | ||||||
| Lanthanum | 33.20 | 23.00 | 23.90 | 21.50 | 17.50 | 23.00 | ||||||
| Lutetium | trace | trace | trace | 0.01 | trace | 0.14 | ||||||
| Neodymium | 12.00 | 18.50 | 17.40 | 18.60 | 17.50 | 17.00 | ||||||
| Praseodymium | 4.34 | 6.20 | 5.00 | 5.30 | 5.00 | 4.10 | ||||||
| Samarium | 0.8 | 0.8 | 2.53 | 3.10 | 4.90 | 3.00 | ||||||
| Terbium | trace | 0.1 | 0.035 | 0.3 | 0.26 | 0.7 | ||||||
| Thulium | trace | trace | trace | trace | trace | trace | ||||||
| Ytterbium | trace | trace | 0.1 | 0.1 | 0.21 | 2.40 | ||||||
| Yttrium | 0.10 | trace | 2.40 | 2.50 | 3.20 | 2.40 | ||||||
| Total | 100 | 100 | 100 | 100 | 100 | 100 | ||||||
| Monazite�Continued | Xenotime | Rare earth laterite | ||||||||||
| Eastern coast, | Mount Weld, | Lahat, Perak, | Southeast | Xunwu, Jiangxi | Longnan, Jiangxi | |||||||
| Brazil8 | Australia9 | Malaysia2 | Guangdong, China10 | Province, China11 | Province, China11 | |||||||
| Cerium | 47.00 | 51.00 | 3.13 | 3.00 | 2.40 | 0.4 | ||||||
| Dysprosium | 0.4 | 0.2 | 8.30 | 9.10 | trace | 6.70 | ||||||
| Erbium | 0.1 | 0.2 | 6.40 | 5.60 | trace | 4.90 | ||||||
| Europium | 0.1 | 0.4 | trace | 0.2 | 0.5 | 0.10 | ||||||
| Gadolinium | 1.00 | 1.00 | 3.50 | 5.00 | 3.00 | 6.90 | ||||||
| Holmium | trace | 0.1 | 2.00 | 2.60 | trace | 1.60 | ||||||
| Lanthanum | 24.00 | 26.00 | 1.24 | 1.20 | 43.4 | 1.82 | ||||||
| Lutetium | not determined | trace | 1.00 | 1.80 | 0.1 | 0.4 | ||||||
| Neodymium | 18.50 | 15.00 | 1.60 | 3.50 | 31.70 | 3.00 | ||||||
| Praseodymium | 4.50 | 4.00 | 0.5 | 0.6 | 9.00 | 0.7 | ||||||
| Samarium | 3.00 | 1.80 | 1.10 | 2.20 | 3.90 | 2.80 | ||||||
| Terbium | 0.1 | 0.1 | 0.9 | 1.20 | trace | 1.30 | ||||||
| Thulium | trace | trace | 1.10 | 1.30 | trace | 0.7 | ||||||
| Ytterbium | 0.02 | 0.1 | 6.80 | 6.00 | 0.3 | 2.50 | ||||||
| Yttrium | 1.40 | trace | 61.00 | 59.30 | 8.00 | 65.00 | ||||||
| Total | 100 | 100 | 100 | 100 | 100 | 100 | ||||||
| 1Data are rounded to no more than three significant digits; may not add to totals shown. | ||||||||||||
| 2Johnson, G.W., and Sisneros, T.E., 1981,� Analysis of rare-earth elements in ore concentrate samples using direct current plasma spectrometry�Proceedings | ||||||||||||
| of the 15th Rare Earth Research Conference, Rolla, MO, June 15-18, 1981:� New York, NY, Plenum Press, v. 3, p. 525-529. | ||||||||||||
| 3Zang, Zhang Bao, Lu Ke Yi, King Kue Chu, Wei Wei Cheng, and Wang Wen Cheng, 1982, Rare-earth industry in China:� Hydrometallurgy, v. 9, no. 2, | ||||||||||||
| p. 205-210. | ||||||||||||
| 4Westralian Sands Ltd., 1979, Product specifications, effective January 1980:� Capel, Australia, Westralian Sands Ltd. brochure, 8 p. | ||||||||||||
| 5Analysis from Consolidated Rutile Ltd. | ||||||||||||
| 6Analysis from RGC Minerals (USA), Green Cove Springs, FL. | ||||||||||||
| 7Xi, Zhang, 1986, The present status of Nd-Fe-B magnets in China�Proceedings of the Impact of Neodymium-Iron-Boron Materials on Permanent Magnet | ||||||||||||
| Users and Producers Conference, Clearwater, FL, March 2-4, 1986:� Clearwater, FL, Gorham International Inc., 5 p. | ||||||||||||
| 8Krumholz, Pavel, 1991, Brazilian practice for monazite treatment:� Symposium on Rare Metals, Sendai, Japan, December 12-13, 1991, Proceedings, p. 78-82. | ||||||||||||
| 9Kingsnorth, Dudley, 1992, Mount Weld�A new source of light rare earths�Proceedings of the TMS and Australasian Institute of Mining and Metallurgy | ||||||||||||
| Rare Earth Symposium, San Diego, CA, March 1-5, 1992:� Sydney, Australia, Lynas Gold NL, 8 p. | ||||||||||||
| 10Nakamura, Shigeo, 1988, China and rare metals�Rare earth:� Industrial Rare Metals, no. 94, May, p. 23-28. | ||||||||||||
| 11Introduction to Jiangxi rare-earths and applied products, 1985, Jiangxi Province brochure, 42 p. | ||||||||||||
Source: United States Geological Survey Mineral Resources Program