I think someone has misread that announcement as drilling assays.
These are dump samples from the Murchison mine grading up to 4.6% Cu, 4% Zn and 0.7% Co. Read in context these are excellent results. If the dump samples run at this then the head grade is significantly higher.
Getting 4.6% Cu in the tailings dumps with Copper at 8 year highs is just want you want prior to drilling.