Randomized distributions of amounts of copper in undiscovered porphyry copper deposits for 163 permissive tracts

This dataset tabulates randomized simulation results for amounts of copper in metric tons in 163 permissive tracts for undiscovered porphyry copper deposits. The data from the child item Simulation results_sorted.csv for each permissive are randomized to allow aggregation of regional and global data using an assumption of statistical independence. This was done by generating a column of 4,999 random numbers and resorting the 4,999 sorted simulations by those random numbers. The randomized distributions for each permissive tract in a region were then summed to compute regional and global totals. For an explanation of aggregation assumptions and underlying mathematics, see Schuenemeyer, J.H., Zientek, M.L, and Box, S.E., 2011, Global mineral resource assessment – Aggregation of estimated numbers of undiscovered deposits – an R-script with an example from the Chu Sarysu Basin, Kazakhstan: U.S. Geological Survey Scientific Investigations Report 2010-5090-B, 13 p., accessed October 10, 2011, at https://pubs.usgs.gov/sir/2010/5090/b/.本数据集以表格形式收录了163个成矿有利区带（permissive tract）内未发现斑岩型铜矿床（porphyry copper deposits）的铜资源量（单位：公吨）随机化模拟结果。各成矿有利区对应的子数据集文件Simulation results_sorted.csv中的数据均经过随机化处理，以满足在统计独立假设下开展区域及全球数据聚合的需求。该随机化处理流程为：先生成一列共4999个随机数，再依据这些随机数对4999组已排序的模拟结果进行重排序。随后将某一区域内各成矿有利区带的随机化分布数据求和，即可计算得到区域及全球的铜资源总量。如需了解聚合假设及相关基础数学原理的详细说明，请参阅Schuenemeyer J.H.、Zientek M.L.与Box S.E.于2011年发表的文献：《全球矿产资源评估——未发现矿床估算数量的聚合——附带哈萨克丘萨雷苏盆地案例的R脚本》，收录于美国地质调查局（U.S. Geological Survey）《2010年科学调查报告2010-5090-B》，全文共13页，于2011年10月10日从https://pubs.usgs.gov/sir/2010/5090/b/ 获取。