Atacama projects often hit an unusual tradeoff: every extra fine helps throughput today but can hurt leach permeability next month. The wrong crusher setting shows up later as pad performance noise.
This note is for teams choosing between low-complexity, balanced, and high-control layouts in the 150-320 TPH class.
30-second decision framework
Condition
Leach pad performance is sensitive to fines generation
Keep reduction work primarily in cone stage with conservative settings
It is easier to protect permeability when breakage is controlled and predictable.
Condition
Site has strict dust permit and limited water for suppression
Prioritize enclosed transfer points and stable recirculation load
Unstable recirculation increases transfer dust and operating interruptions.
Condition
Mine blend swings between soft oxidized zones and harder transition ore
Use route with clear tuning envelope and disciplined blending
Blend control often gives bigger gains than adding another machine too early.
Inputs you must lock before model selection
- Leach team target PSD and permeability envelope.
- Daily blend ratio between oxide and transition ore.
- Dust control constraints per permit and shift.
- Water allocation for suppression and housekeeping.
- Expected variability in ROM top size by pit phase.
Recommended process lines
Lean route
Capacity: 150-210 TPH
Feed: ROM up to 650 mm
Target output: 6-40 mm
Setup: PE Jaw -> PY Cone -> screen
Why this works
- Low equipment count and quick startup timeline.
- Suitable for stable ore blend with moderate variability.
- Good baseline for pilot-scale leach pad expansion.
Balanced permeability route
Capacity: 200-280 TPH
Feed: ROM with moderate oxide-transition swings
Target output: 6-25 mm controlled
Setup: PE Jaw -> PY Cone -> multi-deck screen
Why this works
- Better control of top size without excessive fines.
- Stable operation under mixed ore days.
- Fits most medium-scale Chilean heap-leach programs.
High-control route
Capacity: 250-320 TPH
Feed: High variability, contract-driven production
Target output: Tight 6-25 mm and low upset rate
Setup: PE Jaw -> dual PY Cone -> control screen loop
Why this works
- Separates coarse and control reduction duties.
- Reduces throughput shocks when blend shifts quickly.
- Best for sites where leach pad penalties are expensive.
Chile copper oxide route comparison
| Metric | Lean | Balanced | High-control |
|---|---|---|---|
| Best for | Stable oxide feed | Mixed oxide-transition feed | Highly variable blend with strict leach KPIs |
| Fines control | Basic | Good | Best |
| Operational burden | Low | Medium | Medium-high |
| Main risk | PSD drift on blend changes | Screen bottleneck if maintenance slips | Over-capitalization for short mine life |
| Typical capex | Lower | Medium | Higher |
Leach Team Alignment Comes First
Crusher selection should be signed off together with leach operations. If these teams work in parallel without a shared PSD envelope, the plant spends months in reactive tuning.
The simplest way to prevent this is a one-page acceptance sheet: feed window, fines cap, permeability target, and response plan when blend drifts.
- Define ore blend change trigger for crusher setpoint review.
- Track fines at transfer points, not only final stockpile.
- Keep daily record of pad permeability vs feed PSD.
- Do not approve final layout without joint metallurgy review.
RFQ Language That Actually Helps
Ask each vendor for throughput at three ore scenarios: soft oxide, mixed feed, and harder transition ore. One-point capacity claims are not decision-grade data.
When proposals are normalized on the same ore assumptions, commercial comparison gets clearer and post-award variation orders drop sharply.
RFQ checklist before you contact suppliers
- Target PSD window for leach feed and fines ceiling.
- Ore hardness envelope by pit phase.
- Dust permit and suppression strategy assumptions.
- Expected seasonal blend changes and frequency.
- Accepted recirculation range under normal operation.
- Commissioning acceptance KPIs agreed with leach team.
Need a model recommendation for your project?
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