Red Chris exploration; underground block cave mining https://www.mining.com/web/newcrest-eyes-major-expansion-of-red-chris-gold-copper-project/
"Australia’s biggest gold producer, which is set to be acquired by US giant Newmont Corp., plans to decide later this year on whether to add underground block cave mining to its open pit operations at Red Chris. Meanwhile, exploration at the neighboring East Ridge area was yielding “exciting” results, Duhe said in an interview in Brisbane on Wednesday."
https://www.miningnewsnorth.com/story/2021/10/15/news/red-chris-block-cave-mining-shows-promise/7043.html