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象加拿大这样地质研究比较深入、勘查比较彻底的国家,自五十年代中期以来,金属矿床普查的主要任务是寻找深部隐伏矿床和盲矿床.他们从1951年到1969年,发现新矿床的概率减少了十分之九,而勘查投资却增加了三倍,这就是由于找矿深度逐步增大造成的. 1955年以前,86%的矿床都是在地表和近地表发现的.1956至1968年,在近地表范围发现的新矿床,仅占22%,即78%为深部隐伏和盲矿床. 在厚层疏松物和岩石覆盖条件下,用常规化探方法找矿,效果往往不佳.岩石、土壤和壤中气汞量测量、卤素测量,以及地面微迹系统等都
In countries like Canada, where geological research is more thorough and surveys are more complete, the main task of the census of metal deposits since the mid-1950s has been to search for deep buried and blind deposits, and from 1951 to 1969 they reduced the probability of discovering new deposits Nine-tenths, and exploration investment tripled, due to the gradual increase in prospecting depth.86% of the deposits were found on the surface and near-surface prior to 1955. Between 1956 and 1968, Only about 22% of the new deposits are found in the near-Earth’s surface, ie, 78% are deep buried and blind deposits.It is often not effective to prospect the ore by conventional geochemical exploration in the condition of thick loose and rock cover.The rock, Gas and mercury measurements in soils and soils, halogen measurements, and so on