iron ore production in the Pilbara
Activities involved in obtaining, mining and processing iron ore at our Pilbara operations have been simplified inside the following diagram. Rio Tinto operates 11 iron ore mines in the Pilbara plus the certain sequence of activities varies from mine to mine. Excellence in preparing, scheduling and top quality manage are basic to the method.
Resource development
1. Exploration and evaluation
The team identifies and quantifies ore bodies, by utilizing a range of geological, geophysical and metallurgical strategies. In its simplest form exploration entails drilling in remote places to sample areas.
2. Metallurgical assessment
The data from exploration activities is logged, mapped, analysed and interpreted via models.
3. Mine preparing and scheduling
The team develops a detailed strategy of which ore bodies to mine in what sequence, to deliver the required item high quality at an appropriate cost. The approach of mine organizing commences many years before a mine is developed, and continues on a day-to-day basis once the mine is operational.
Iron ore Mine operations
Drill and Blast
Areas for open-pit mining are selected using the mine program. Identified areas are tagged, and then holes are drilled in an appropriate pattern by rigs. The drill holes are filled with an explosive, most often ANFO (Ammonium Nitrate/Fuel Oil) and then charged. The resulting blast breaks the material to a size necessary for digging. chrome ore beneficiation
Load and Haul
The broken material is loaded for transport by face shovels, excavators or front-end loaders into haul trucks. Haul trucks at our operations are typically in the 190 tonne and 240 tonne class. Overland conveyors are used to transport partially crushed feed at sites
where there are long distances between the pits and method plants.
Process
Processing of the ore ranges from simple crushing and screening to a standard size, by means of to processes that beneficiate or upgrade the good quality of the iron ore products. This is done by physical processes, which remove impurities by differences in particle density or size gravity or size separation. Processing may be wet or dry.
Stockpile and rail-load out
The processed ore is stockpiled and blended to meet item top quality requirements, before being reclaimed and conveyed to rail load-out. The ore is loaded into ore cars for transport for the port facilities.
Rail and port operations
Rail
Ore is railed up to 460 kilometres for the coast along a dedicated privately owned rail system. A typical train consist comprises 2 GE Dash 9 locomotives, 230 ore cars and is over two.4 kilometres long. A single driver, supported by centralised track control, operates the train.
Ore car dumping
Once the train arrives at the port the ore cars go by means of the car-dumper. The ore cars are rotated and the ore flows out into bins and then is discharged onto conveyors. copper ore beneficiation plant
Stockpile
The ore is stockpiled according to item type and also the quality control plan. The travelling stackers create 250m long stockpiles. Rotary bucket-wheel reclaimers later reclaim the ore, which will be conveyed to the ship loader.
Ship-loading
Vessels are loaded at the berths alongside the ore wharf. Lump ore is rescreened to remove undersize material. Reclaimed ore is conveyed along the wharf and the ore is loaded into the vessel’s holds by travelling, slewing and luffing shiploaders.