@Yahaia, there are evidences of copper absorption by the colon of sheep (Turner et al, Comp Biochem Physiol C. 1987). A real method to reduce this process is not reported in literature at the best of my knowledge. However, in the presence of colitis, the absorption of copper as well as of other elements is reduced.

Thank you Ieradi Enzo,

I found very scarce information regarding colonic absorption of Copper from the colon. One paper said that copper is mostly absorbed in the stomach and duodenum but did not give more information about colonic absorption.

The following elements (Mo, Cd, Hg, Zn, Fe, Pb, K and P) may be antagonistic to copper uptake. Prolonged high intake of these elements, singularly or in combination, can produce a copper deficiency, especially if the nutritional or tissue copper status is marginal. The nutritional minerals among these elements can be used in the treatment of copper toxicity. Some vitamins that are considered antagonistic to copper are Vit. B6, Vit. A, Vit. B3, Vit. B5. Excessive intake of any one or combination of these vitamins can contribute to or exacerbate an existing copper deficiency. (Watts, D.L (1989). The Nutritional Relationships of Copper. Journal of Orthomolecular Medicine, 4(2), 99-108). I hope this information may help.

Colon absorb copper from 12 to 67% depend upon various factor. Kindly refer interesting paper for other details :

Raul A Wapnir ( 1998 ). Am. J. Clin. Nutr., 67, page 1054-1060.

Thank You dear Virendra Kumar Saxena for your input. I did not find in the article you mentioned information regarding colonic absorption of copper. Could you please show me where I miss this information?

Best regards,

Dear Dr. Yahia, I am sorry as forget to write the title of this paper. 

Copper absorption and bioavailability by Raul A Wapnir ( 1998 ), American Journel of Clin., Nutrition., 67, page 1054-1060.   

Dear Virendra, 

I read it fast again but no mention of the colon. Only the small intestine.