Of course, I was trying to stick to things that BLK have some...

Of course, I was trying to stick to things that BLK have some (maybe) control over. There would obviously be a lot more mines economical at a higher gold price but for the companies with a low AISC it's cream for them and their share price would also reflect this. It's impossible to know which investment would be best in a higher gold price scenario but solid mines tend to stay open a lot longer than ones being supported by an unusually high gold price.