Enhanced absorption of iron from the intestine leads to the hemochromatosis, while the reduced serum copper level leads to the development of Menkes disease. Your question is whether or not iron and copper ions antagonize each other. It is important to keep in mind that ATP7a transporter belongs to ATP-dependent copper transporter involved in intestinal copper export that is strongly induced in the intestine of iron deficient mouse model.
Article Transcriptional regulation of the Menkes copper ATPase (Atp7...