But deposits large and concentrated enough to be worth mining are indeed rare.
但是，沉积或富集到有开采价值的却实在难找。
Such concentrated deposits ought to make underwater mining highly efficient.
这样的集中式分布可以使水下开采效率大大提高。
Instead, Chinese Banks have focused on buying small stakes in multinationals while resources companies have concentrated on individual mining projects.
中国的银行一直在专注于购买跨国企业少数股权，资源公司则把注意力放在单个矿业项目上。
Jiangxi province is a big nonferrous metal producer that has a long mining history and where the producing areas are concentrated and some world class mines were build in succession.
江西省是有色金属矿产大省，开采历史悠久，产地集中，并陆续集成了一批世界级矿山。
The research purpose of data mining is that in large scale data concentrated, find the certain regularity information that hidden, people are interested in.
数据挖掘的研究目的是在大型数据集中发现那些隐藏的、人们感兴趣的具有特定规律的信息。
The research purpose of data mining is that in large scale data concentrated, find the certain regularity information that hidden, people are interested in.
数据挖掘的研究目的是在大型数据集中发现那些隐藏的、人们感兴趣的具有特定规律的信息。
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