Just Googled another tribute mining agreement and I found an...

Just Googled another tribute mining agreement and I found an example where the miner paid the resource owner 10% of gross sales. I guess that would add a degree of risk to ERM if we adopted that structure as we'd receive less revenue if the POG falls; however we'd have greater upside should gold rise.

Anyway, mwatts, I guess the answer is going to be either $x/oz or a % of gross sales. It's probably commercial in confidence so we may never actually find out the exact nature of the agreement.