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Impact Factor is a measure of the frequency with which the 'average article' in a journal has been cited in a particular year. The Journal Citation Reports (JCR^®) impact factor, published by Thomson Scientific, is basically a ratio between citations and recent citable items published. Thus, the impact factor of a journal would be calculated by dividing the number of all current citations of source items published in the journal during the previous two years by the number of articles the journal published in those two years. By providing some qualification of the quantitative data in the JCR^®, the impact factor is an important tool for journal evaluation.

Below are the leading refereed journals in Mineral Processing and Extractive Metallurgy, ranked by impact factor :

For an indepth look at how impact factors are calculated see Perspectives in Publishing, No 1, October 2000 (PDF). Perspectives in Publishing is an occasional newsletter which aims to address generic issues in scholarly communication produced by Elsevier Science. An interesting discussion on Impact Factor can be found at: www.meionline.proboards2.com/index.cgi?board=general&action=display&thread=1136555961

Please note that Perspectives in Publishing is provided in the Adobe Portable Document Format (PDF) for which the Adobe Acrobat Reader is required.