In comparing the price paid per oz of gold reserve in the...

In comparing the price paid per oz of gold reserve in the purchase of these various project, as you have done, isn't there a problem that not all reserve ounces are created equal?

Doesn't the calculation of the reserve ounces depend on some assumption about the gold price and the costs to recover the gold?
Thus, for an identical resource, the reserve calculation made in 2019 for the gold price and mining costs then prevailing would not be the same as one made now.

An ounce of gold in a nugget at my feet is worth nearly the prevailing price of gold.
Whereas, an ounce that is 300m underground and dispersed through 10 tonnes of rock is worth a lot less than the prevailing POG.
And yet both ounces of gold might qualify for inclusion in a reserve, or am i missing something?

Also, the with a small change in the price of gold, the underground ounce might not qualify as a reserve ounce whereas the ounce at my feet will still qualify with just about any gold price above zero.
In which case, the size of some reserves will be more "elastic" with respect to the gold price than others, which entails more risk with respect to changes in the POG.

Presumably these factors would affect how much someone would be prepared to pay per ounce of reserve.

Cheers