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本文所涉及的砂矿,多数是冲积矿,同时也有一些洪坡积矿和产于松散堆积物中的其他矿床.其中许多矿床由于交通方便、矿体组分简单、采选条件较好,能很快开采利用,因而使地质勘探工作成果很快生效.但是,也有一些砂矿床,虽然在评价时认为有工业价值,实际上却长期未予利用而成为“呆矿”.还有的矿区在投产后发现资源条件与评价结论差距甚大,或地质工作遗留问题甚多,使矿山生产感到被动.这些情况说
The sandstones involved in this article are mostly alluvial deposits and some flood-slope deposits and other deposits in loose deposits, many of which are easy to transport and have simple ore body composition and good mining conditions Soon to be exploited and utilized, so that the results of geologic prospecting work will soon take effect.However, some sand deposits, although considered as industrial value during the evaluation, have actually become unused for a long time and become “dug mines.” After the mine is put into operation, it is found that there is a big gap between the resource conditions and the conclusion of the assessment or there are many problems remaining in the geological work so that the mine production can feel passive.