The drilling, which will target the Dimbi zone, was scheduled to start over the weekend and is expected to finish in early December.
"The drill holes will target recently mapped mineralised structures, of which six holes will jointly test updip projections of elevated copper intercepts in existing drill holes," Marengo said.
The explorer revealed that the Dimbi zone, which contains a fault, had received less previous attention compared to other project zones due to challenging terrain.
Field mapping of the Dimbi zone was undertaken over recent months.
Marengo said an elongated copper-in-soil geochemical anomaly ran parallel to, and overlies the hanging wall of the Dimbi Fault.
Shares in the explorer closed down 7.7%, or 0.2c, to 2.4c on Friday.