井下布置在博茨瓦纳发现AK1金伯利岩管之前,普列米尔岩管一直是南非最大岩管,面积32公顷,成椭圆形,长短轴分别为900米和460米,管壁为布什菲勒得火成岩杂岩的坚硬致密长石。这与别的金刚石岩管不一样。在400米深处,有一条后生的金伯利辉长石岩床,横切整个岩管和围岩。在地表,岩管被石英岩分开,石英岩在深部随着金伯利岩的 Downhole Arrangements Prior to the discovery of the AK1 kimberlite tube in Botswana, the Primiel tube has been the largest in South Africa and occupies an area of ​​32 hectares, elliptical with major and minor axes of 900 and 460 meters, respectively, with bushfleet igneous ores Hard, dense feldspar of rock. This is not the same with other diamond tube. At 400 meters deep, there is an ephemeral kimberly gabbro bed that traverses the entire tube and the surrounding rock. On the surface, the rock tube is separated by quartzite, which is deep in the kimberlite