MINE 310 Study Guide - Final Guide: Pore Water Pressure, Version Control, Ground Freezing
5 Jan 2017
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Document Summary
Mine design mine design is cyclic and iterative. Initial assumptions: work through the design with modifications, gather more data, review and change assumptions. Maintain operation viability (physical access & equipment flexibility) Defer waste stripping requirement as much as possible. Maximize pit slope angle examine economic merits of alternative scenarios. Higher tonnage lower average grade, lower cut off-grade. Ground water control - to allow excavations to be made in workable dry and stable condition below natural groundwater level. More effective (better trafficking and diggability, reduced downtime) lower blast cost (dry blast hole, avoid emulsion) lower haulage cost (lighter material) Higher fs steeper slope avoid erosions, piping of weak zones, base heave. Source control intercept run-off surface drainage ditch around pit. 3 aspects to design and implementation of mine dewatering: Exclusion cut-off walls, grouting, ground freezing. Dewate(cid:396)i(cid:374)g is (cid:862)distress purchase(cid:863) it is only done when necessary. Placement methods end-dump, layer placed, heaped embankment. Types/methods: large fan, high wedged, terraced, free flow.
