Open-Pit Crushing Circuit
For open-pit mines on hard rock ROM: one line from the receiving hopper to the stockpile belt, sized for 400 t/h and for rock up to 280 MPa UCS.
Applicable products & materials
Hard rock ROM: granite, basalt, ore
Design limit 280 MPa UCS; capacity is set by the abrasion index and a 200 kg PSD
Process steps
Feed and scalp
ROM is tipped into the hopper. The grizzly takes fines out ahead of the jaw at 100 mm bar spacing, deck 1 100 mm wide.
Primary crushing
Jaw at a 1 200 × 900 mm feed opening, CSS 125–200 mm. Granite runs 380–520 t/h through this stage.
Secondary crushing
Cone on a 900 mm head, closed with the screen: oversize goes back to the cone, not to the stockpile.
Screening
Triple-deck 2.4 × 6.0 m screen splits the product. Its top-deck return is the circulating load.
Technical data
| Nominal capacity | 400 t/h |
|---|---|
| First-set lead time | 16 weeks |
| Repeat steel lead time | 10 weeks |
| Design limit, UCS | 280 MPa |
| Primary jaw feed opening | 1 200 × 900 mm |
| Primary capacity, granite | 380–520 t/h at CSS 125–200 mm |
| Grizzly deck | 1 100 mm wide, 100 mm bar spacing |
| Screen | 2.4 × 6.0 m, triple deck |
| Conveyor belt width | 1 200 mm |
Delivery scope
Other circuits
Send the rock type. Get a first view on t/h.
Tell the applications desk the rock, the target product, and whether it's a pit, a decline, or a quarry. An engineer replies within three working days with a first view on tonnage and a first-steel date.