transport cost

I found a document we can roughly estimate the transport cost to bring ore from within Zambia to port:

http://siteresources.worldbank.org/INTZAMBIA/Resources/copper-mining-summary-note(online-copy).pdf

By truck: 6.7c/tkm --> $25/t for 350km(?)
By train: 1.6c/tkm --> $25/t for 1500km(?)

Mining and processing cost for on or near surface with crushing, screening is not a big cost. I would give another $25/t as a high range end number.