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Evaluating Uncertainty in Kimberlite Pipe Volume by Simulating Geometry in Cylindrical Coordinates

机译:通过模拟圆柱坐标中的几何来评估金伯利岩管的不确定度

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A significant source of uncertainty in kimberlite pipes is the volume of the ore deposit. Often all material within the pipe can be considered ore, leaving the actual geometry of the pipe as the largest source of uncertainty. Deterministic methods to assess uncertainty are time consuming and not reproducible. It is desirable to use stochastic techniques to model the pipe geometry as they will generate multiple realizations that are reproducible and can be used to assess the uncertainty in the pipe geometry. Once the realizations are completed, traditional geostatistical techniques can be used to assess the uncertainty in pipe volume. Generating stochastic realizations of pipe geometry is a difficult problem. The methodology proposed uses sequential Gaussian simulation of pierce points interpreted from drill holes dirough a kimberlite pipe. Kimberlite pipes are cylindrical in shape; therefore, the data will be transformed to cylindrical coordinates to facilitate the simulation of the pipe geometry. Rather than using xyz coordinates to define the pierce points, z,θ and the pipe radius are used. In cylindrical coordinates the radius variable can be simulated in z-θ space to generate multiple realizations of the pipe volume. The uncertainty in the volume of ore can then be evaluated. This methodology will be demonstrated with a data set from a kimberlite pipe at BHP Billiton's Ekati mine.
机译:金伯利岩管道不确定性的一个重要来源是矿床的数量。通常,可以将管道内的所有材料视为矿石,而使管道的实际几何形状成为不确定性的最大来源。确定性方法用于评估不确定性是耗时且不可重现的。理想的是使用随机技术对管道几何形状进行建模,因为它们将生成可重现的多种实现,并可用于评估管道几何形状的不确定性。一旦实现完成,就可以使用传统的地统计技术来评估管道体积的不确定性。生成管道几何形状的随机实现是一个难题。所提出的方法使用了顺序高斯模拟的刺穿点,这些穿刺点是从金伯利岩管钻出的钻孔中解释的。金伯利岩管是圆柱形的。因此,数据将转换为圆柱坐标,以便于模拟管道几何形状。不是使用xyz坐标来定义刺穿点,而是使用z,θ和管道半径。在圆柱坐标中,可以在z-θ空间中模拟半径变量以生成管道体积的多个实现。然后可以评估矿石量的不确定性。必和必拓Billiton的Ekati矿山的金伯利岩管道的数据集将证明这种方法。

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