MATLS 4I03 Lecture : Lecture_8_13.pdf
11 Feb 2014
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Document Summary
The materials cycle (cid:1) recycling contributes to lowering both. & years of supply, 1995 - 1997 (cid:1) reserves can also be expressed in terms of years at current production rates, assuming no recycling. Effect of recycle rate on the supply of. Metals (cid:1) simple calculation of years of reserves for assumed recycle rates (cid:1) goes to infinity at 100% (cid:1) assumes there is no problem in reaching such rates (cid:1) ignores the life-span of the products containing the metals. Depletion of high grade ore (cid:1) higher grade reserves have been depleted, so lower grade ore bodies are being mined (cid:1) example for copper in the usa. Influence of ore grade on gwp (cid:1) additional energy used in mining and mineral processing to treat additional gangue (cid:1) once the concentrate has been produced the downstream procession (smelting & refining) there is little change in processing.
