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Fracture Geometries in Three Ore Bodies Mined by Undercut Caving as Determined from Oriented Drill Core and Scanline Mapping

机译:从定向钻芯和扫描线测绘确定的三种矿体开采中的裂缝几何形状

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The Bureau of Mines report characterizes the fracturing geometries in three ore bodies that are mined by undercut-cave methods, utilizing data that were generated by measurements on oriented diamond drill cores and along multiple scanlines on underground exposures. Procedures employed for data acquisition and for data analysis are described in detail. Numerous polar equal-area plots of fracture orientation and histograms of fracture spacing, obtained by Bureau-developed codes FRACTAN and GDIST, are presented. Fracture-trace-length estimates are derived from the multiple-scanline mapping measurements, a new procedure.

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