Gold cut off grades

[notanewmember]

IF gold reaches $1500 /oz and remains there for a long time [3 years +], low grade gold deposits will become attractive.

 

Does anybody know at what cut off grades does $800/oz gold become unattractive?

 

Thanks in advance.... it will help if the the cheaper juniors with lower grades are worth holding/adding to looking on a 5 year outlook.