Mine tailings dumps at the Kalengwa copper project in Zambia have yielded an average grade of 1.03% copper and 4.44 parts per million silver, with copper values ranging from 0.59% to 2.48%, according to assay results from preliminary sampling by resource, development and mining company Xtract Resources. Xtract executive chairperson Colin Bird said in a statement released last month that the result confirmed copper grades in tailings over a large sample population, similar to results reported in the 2013 resource estimate for the Kalengwa copper project, in the North-Western province, 800 km north-west of Lusaka and 400 km south-west of Kitwe.
