You can't really extrapolate them or use one to make an accurate estimate on the other. It's not a hard science, it just gives you a feel for the atmosphere and what's possible. It's not even the same buyer so even then, different things are worth different amounts for different people.

An example of why you can't just extrapolate the value is because it's not just the amount of metal that matters, but how much it costs to get out, and the risks involved. We can't just say "we have the same amount of silver" and it becomes intuitive as to why if we just said "alright, we now both have JUST the same amount of silver". We know that we have different climates and infrastructure required so how profitable is going to change. With have different political and social climates so the cost of workers and intereference from government is going to change.

There's just no easy comparison; what's important is that companies will release these sorts of things "out of the blue" and "during the holidays" and "pay premiums" which are some of the things people are worried about. Orko helps negate those fears by showing us a present example of these things not being a concern for another company.