J4P your observations are not entirley accurate.
The Cu Con is being paid for in this manner (as best I can recal but no doubt will be corrected) 75% is paid on LEAVING the mine, 10% on arrival at the smelter, and the final 5% on the issuance of the assay / content report from the smelter. So yes you did leave something out, there is cash flow, and all that would be on account so to speak would be a 5% balance due paid on demand on issuance of the report from the smelter.
At least that is what I read.