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西班牙西部钻孔中石英脉厚度和金品位的分析表明二者大体服从幂次律分布，暗含着一种分形关系。脉厚（ｔ）对累积频率（Ｎ）的双对数困反映出与金、品位有关的系统变化。在方程Ｎ＝ｃｔ￣（－Ｄ）中的幂指数Ｄ，在高品位区间内较低，表明较厚的脉中扩张作用较强，从而为含金流体的运移提供了通过。因此，脉体厚度分布的鉴别为区别脉状金矿床中矿化与非矿化构造提供了一种方法。
The analysis of quartz vein thickness and gold grade in boreholes in western Spain shows that the two generally obey the power law distribution and imply a fractal relationship. The double logarithmic trap of pulse thickness (t) versus cumulative frequency (N) reflects systematic changes related to gold and taste. The power exponent D in the equation N = ct ~ (-D), which is lower in the high-grade interval, indicates stronger dilation in the thicker vein and thus provides for the passage of gold-bearing fluids. Therefore, the identification of pulse thickness distribution provides a way to distinguish between mineralized and non-mineralized structures in vein-like gold deposits.