名词
中文翻译：Unknown
同义词：
['mining', 'mining method', 'mining technique']
例句：
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1. The company's placer mining operation has been a major source of revenue for years.
该公司的矿床开采业务多年来一直是收入的主要来源。
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2. The miners used a variety of methods to extract the valuable minerals from the placer mining site.
矿工们使用多种方法从矿床开采现场提取有价值的矿物。
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3. The new mining techniques have greatly improved the efficiency of placer miningoperations.
新的采矿技术大大提高了矿床开采作业的效率。