Copper in rocks is likely to be more mobile under this type of condition, as opposed to alkaline
Zinc occurs naturally in soil (about 70 mg kg1 in crustal rocks) [52], 
.... Copper and Zn are two important essential elements for plants,... [DOC] [TLE] Chapter 8 Gold Deposits Related to Alkaline Magn'iatism [PAR] Lold deposit-s associated wit it alkaline rocks include.