Economics of lower grade sulphide projectsToday's negative nellies and sellers may be tomorrows weepers. Copper is produced low grade so why not nickel sulphide ?
BHP uses .5% cut off, so .3 to .4% or bit lower is not profitable with nickel at record prices ? Just like low grade gold deposits spread over huge areas they become more profitable as gold price gets.
The neagative armchair geologists here are probably short or wouldn't waste their time posting.
Can Low-Grade Bulk Nickel Ever Be Profitable? Short Answer: Yes
https://www.cruxinvestor.com/articles/low-grade-bulk-nickel