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本文报道了“Uranerz勘探和采矿公司”目前用于对阿萨巴斯卡盆地更深部的不整合面铀矿床的勘探技术和成矿的成因模式。本文的主要目的是:(1)提出一个当前勘探工作中使用的不整合面铀矿床的成因模式;(2)介绍Uranerz公司使用的勘探技术的顺序,用来勘查厚达1000m砂岩覆盖的阿萨巴斯卡盆地地区的铀矿。阿萨巴斯卡不整合面矿床坐落在加拿大萨斯喀彻温北部。在前寒武纪阿萨巴斯卡盆地内,勘探公司已发现了18个铀矿床。这些矿床含5亿多公斤铀,平均品位波动O.3%～12％。1975年Uranerz发现的凯湖矿床最近成为世界最大、最富的露天铀矿山。Uranerz还拥有全部位于萨斯喀彻温的“拉比特湖”、“中西湖”和麦克阿瑟河矿床的股份,并积极从事世界范围铀矿的勘查活动。头一个发现的是1968年在阿萨巴斯卡盆地东部的“拉比特湖”,随后,1975年发现了“凯湖”。两个矿床都具有地表显示,如:放射性漂砾,周围湖区和沼泽的强地球化学异常,以及明确的地球物理特征。发现凯湖之后,确立了一个勘查模式,包括下伏的石墨质层及其强电磁特征。此后,沿着这些电磁显示运用系统钻探,获得了许多新发现。地球物理和地球化学技术的改进在较大深处导致了新发现。1988年,在500m深处发现了麦克阿瑟河矿床。
This paper reports on the exploration techniques and metallogenic patterns that Uranerz Exploration and Mining Company currently uses for deeper unconformity uranium deposits in the Athabasca Basin. The main objectives of this paper are: (1) to propose a causal model for unconformity uranium deposits used in current exploration; and (2) to introduce the sequence of exploration techniques used by Uranerz to survey Assam Uranium Mine in the Baska Basin. The Athabasca unconformity deposit is located in northern Saskatchewan, Canada. In the Precambrian Athabasca Basin, exploration companies have discovered 18 uranium deposits. These deposits contain more than 500 million kilograms of uranium, the average grade fluctuations O.3% ~ 12%. The Kaihu deposit discovered by Uranerz in 1975 has recently become the largest and richest open-cast uranium mine in the world. Uranerz also owns all the Lake Rabbit, Saskatchewan and MacArthur deposits in Saskatchewan and is actively engaged in uranium exploration worldwide. The first one to be discovered was the “Rabbit Lake” in the eastern part of the Athabasca Basin in 1968, followed by the discovery of the “Kai Lake” in 1975. Both deposits have surface features such as radioactive boulders, strong geochemical anomalies in the surrounding lakes and swamps, and well-defined geophysical characteristics. After discovering Kai Lake, a survey mode was established that included the underlying graphite layer and its strong electromagnetic signature. Since then, many new discoveries have been made using systematic drilling along these electromagnetic displays. Improvements in geophysical and geochemical techniques led to new discoveries in greater depth. In 1988, the MacArthur River deposit was discovered at a depth of 500 m.