EAE1022 Lecture Notes - Lecture 11: Mesothermal, Lead, Volcanic Pipe
16 Aug 2018
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Eae1022 lecture 11 - earth, atmosphere and environment. Mineability shape of ore body: open pit (cheaper) vs. underground (expensive) ground/surface water stability of ground. Extractability: can you actually extract the metal! "hidden" gold in lattice of pyrite or arsenopyrite: ore too fi(cid:374)e grai(cid:374)ed, penalty elements for smelting/processing. "preg" robbing by carbonorganic sediments make it impossible to extract gold from the rocks (mcarthur river nt: means that some resources may never become ores as just cannot economically extrac t the metal. Magmatic deposits: magmatic crystallisation, physical transport by magma. Magmatic crystallisation: early: high density ore minerals (oxides): chromite (cr), magnetite (fe), ilmenite (ti, v); sink t, bottom of magma chamber (cid:862)layered i(cid:374)trusio(cid:374)s(cid:863) (e. g. , bushveld complex, south africa; sillwater complex, usa) Late: release of fluid/volatile components (h2o, so2, co2, etc. ) + incompatible elements (ra re earth elements (ree), f, w, sn, nb, u, etc). Separation of immiscible metallic sulphide liquid: basic/ultrabasic rocks only. Sulphur saturation: addition of externally derived sulphur.
