of copper tubing 42 as previously shown in fig3 4 and 5 a mixture of copper brass iron pyrite and magnetite reference numeral 48 treated as described herein is poured into the tubing which is then capped with a plug 50 on each end the length of a bus bar can and does very from application to application the particular length chosen to fit the application one advantage of using such a bus bar is to provide a more conductive lead to both the anode and cathode thus providing more current and less voltage drop to the cell according to another aspect of the present invention electrodes including anodes and cathodes for zinc hydrometallurgy electrowinning electroextraction processes is formed using substantially the same mixing process as used for the copper anode with only one exception that exception is the substitution of substantially equal amounts of additional brass and iron pyrite in place of the copper at reference numeral 26 in the process illustrated in fig2 the brass should be high in zinc not copper a brass composition having by weight about 68 5 copper about 1 5 lead and about 30 zinc has been found to be suitable for this application the zinc hydrometallurgy electrode is made using the same process shown in fig2 used to form the.