may 01, 2013 copper ore industrial-craft-wiki. 20 feb 2013 . copper ore is the only source of copper. it can be found between layers 10 and 70 with max concentration on level 40 (?) and usually in veins .,copper in plants cropaia,copper availability in soil and uptake by plants. copper exists in soils as cu 2 and most of the copper is absorbed by the plant as cu 2. once absorbed, it accumulates mainly in the roots. its concentration in plant tissue ranges from 5 to 20 ppm and in soil from 2 to 100 ppm (mg kg-). however, most of the copper in the soil is not available for plants.