| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Research Abstract |
Heavy rare earth elements (HREE) are predominantly produced from ion-adsorption type REE (rare earth elements) deposits consisting of weathered granites. This study aims to elucidate the genesis of ion-adsorption type deposits, to develop an exploration method and to estimate a resource potential of REE.
Occurrences and weathering susceptibility of REE-bearing minerals have important roles in the ore formation. REE fluorocarbonates, allanite and titanite are preferable REE-source minerals for the ion-adsorption ores. Since Ce depletion of weathered granite is positively correlated with percentage or concentration of ion-exchangeable REE, the Ce anomaly is a good indicator in exploration of the REE ores.
Thickness of weathering crusts is mostly less than 10m in the surveyed areas. The mineral resources are estimated to small (<10,000 tonnes) to middle (50,000 - 500,000 tonnes) based on the definition of China.
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