Copper epithermal

Keywords Epithermal Gold, Porphyry Copper, Geostatlstic, Enrichment Blanket, Reserve... 

Compared to porphyry copper deposits 5 " S-valnes in epithermal deposits are more variable due to lower temperatures of formation and significant amounts of both sulfide and sulfate in the hydrothermal flnid. 

Hydrothermal activity associated with volcanism introduces into the environment high quantities of heavy metals, and in some cases, this activity can even produce ore deposits. Classic examples are porphyry copper and epithermal gold deposits (Bodnar, 1995 Hedenquist and Lowenstem, 1994). For the Bagnoli area, this scenario is confirmed both by research carried out on the waters in front of Bagnoli (Damiani el al., 1987 Sharp and Nardi, 1987) and by recent studies... 

Over 65% of all mined copper comes from deposits associated with igneous rocks, i.e., the porphyry, skarn, epithermal, replacement, and massive sulfide deposits, with just over half coming from porphyry type ores (Singer, 1995). The next most important category for contained copper, according to Singer, is sediment-hosted deposits (23%). In contrast, the proportion of zinc... 

The work of the author on the analysis of Mesoamerican bronze has already been mentioned, but in several other cases the non-destructive or small scale of sampling came into play. Gilmore and Ottaway discuss this point in the work of Thompson and Lutz larger artifacts of bronze were also studied Finally, it should be mentioned that other methods involving neutron reactions have also been used in the study of ancient bronze. For example, Li Hu Ho has published the analysis of a 4000-year old Qi culture bronze mirror Similarly, Gilmore has employed epithermal neutron activation. Glascock et al. have demonstrated the utility of prompt (capture) gamma rays in the non-destructive analysis of copper-based artifacts the method is not however sensitive to trace elements. ... 

Gilmore GR (1976) Analysis of Ancient Copper Alloys using Epithermal Activation Techniques, in Proceedings Fourth Internat. Conf. Modern Trends in Activation Analysis, p. 1187 Glascock MD, Spalding TG, Biers JC, Comman MF (1984) Archaeometry 26 96 Wessen G, Ruddy FH, Gustafson CE, Irwin H (1977) ibid. 19 200... 

First of all, the data in the table are fudged for the actual irradiation space named (epithermal and fast neutron activation is included). Second, normal isotopic abundances are already factored into the tables. Let s calculate activity produced by irradiation of 2.5 grams of copper for 30 minutes. The table shows two copper activation products, Cu " and Cu . Cu " has a 4.61E4 sec (12.82 hour)... 

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