Through an exploratory survey of residual deposit in the sourthern zone of a copper ore mine, inclined thin veins with difficult occurrence and complicated mining conditions were discovered.
对于急倾斜极薄矿脉的开采国内外最常用的采矿方法是浅孔留矿法，实践表明，该法存在人工劳动强度大、矿石贫化率高等缺点。
Methods: Using an online questionnaire survey to collect 263 valid questionnaires, exploratory factor analysis and multiple linear regression analysis were used for data analysis.
方法：通过问卷调查法搜集了263份有效问卷，采用探索性因子分析法和多元线性回归分析进行数据分析。
At present, the national land resources survey project evaluation hasn't perfect evaluation method and evaluation system, and is still in the exploratory stage.
目前，国土资源大调查项目评价尚无比较完善的评价方法、评价体系，仍处于探索阶段。
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