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Two Supporting Information Files are provided as a supplement to the Methods section of the attached manuscript. Both files are.xlsx data files. Supporting Information File 1 (Data Set S1) is an extended method for the column chromatography process undertaken for copper separation prior to isotopic analysis. Support Information File 2 (Data Set S2) provide long-term values for the in-house copper ore mineral standards used within and developed as part of this study.
| selected citations These citations are derived from selected sources. This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 1 | |
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| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Average | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Average |
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