How do electric shovels load ore in large open-pit mines?

In large open-pit mines, electric shovels are primary implements used to load fragmented ore into transport vehicles. These machines utilize electric motors powered by external lines to drive their digging and loading mechanisms.12

The loading process typically follows these steps:

• Fragmentation: Before loading, the rock is broken into a manageable pile through blasting, which uses carefully sequenced explosives to ensure the material is ready for efficient excavation.1
• Digging: The shovel uses a dipper (bucket) to scoop the fragmented material. These dippers are large, with capacities ranging from 15 to 50 cubic metres, allowing them to move 30 to 100 tons of material in a single bite.1
• Loading: The shovel operator maneuvers the bucket to deposit the ore into trucks. To maintain operational efficiency, the shovel size is matched to the truck capacity; a common industry standard is to fill a truck in four to six swings of the shovel.1

Once loaded, the ore is typically hauled to a mineral-processing plant for further treatment.1