Michael Oliver calling for US$50 Silver by November buckle up !, page-9

interesting comment from The Vet below.

"With Australia's general mining and exploration industry in the doldrums now, it shouldnt be too hard to find competetive contractors to build the mine at reasonable prices, unless those workers and businesses pivot into domestic construction."

This is significant for BML because they are in the process of doing a FEED study and if costs are starting to come down Sorby Hills will become more attractive for financiers and the FEED study will highlight this and would be a market moving event when it's released if that is the case.
The DFS was put together at a time of high costs so there is potential for a surprise if the FEED study comes up with significant savings.