Yep (per my speculation in an earlier post), looks like the copper, and the Australian stock, rally this evening has to do with new stimulus in China:
"PBOC's RRR Rule Change Is Only the Beginning of 2019 Stimulus
By Kyoungwha Kim(Bloomberg) --
The PBOC revealed yet-another unwavering support for small businesses late Wednesday. Asian markets may receive a boost if that can hearten mainland investors.
The monetary authority lowered the bar for banks' lending to SMEs to broaden the scope of companies accessible to the targeted RRR program. Small stocks listed on the mainland bourses stand to benefit from the move CICC sees releasing up to 400b yuan of liquidity."