In Mongolian base-metal operations, feed consistency problems often begin at mine dispatch and end in flotation variability. The crushing front end must absorb that instability.
This guide compares three route options for 90-220 TPH lead-zinc projects with strong seasonal constraints.
30-second decision framework
Condition
Underground blend variability is high week to week
Use balanced route with strong screen recirculation control
Consistent top size protects grinding and flotation response.
Condition
Winter logistics create spares and maintenance uncertainty
Avoid unnecessary complexity in early architecture
Reliability under constrained maintenance windows has higher value than peak nameplate.
Condition
Recovery KPI is tied to tight feed envelope
Move to high-control route with staged reduction duties
Tighter envelope needs clearer role separation across crusher stages.
Inputs you must lock before model selection
- Blend variability by stope and dispatch route.
- Target feed envelope for grinding and flotation.
- Winter maintenance and spare lead-time constraints.
- Power supply stability by month.
- Historical flotation response to feed-size drift.
Recommended process lines
Reliability-first route
Capacity: 90-140 TPH
Feed: Variable sulfide feed up to 500 mm
Target output: Stable feed for downstream grinding
Setup: PE Jaw -> PY Cone -> screen
Why this works
- Simple and robust under constrained maintenance.
- Low operator burden for smaller shifts.
- Good baseline for early production stabilization.
Balanced flotation-feed route
Capacity: 130-180 TPH
Feed: Mixed lead-zinc sulfide blend
Target output: Reduced top-size variance
Setup: PE Jaw -> PY Cone -> controlled screen loop
Why this works
- Better consistency for flotation preparation.
- Handles blend changes with manageable complexity.
- Common sweet spot for mid-size operations.
High-control recovery route
Capacity: 170-220 TPH
Feed: High-variability feed under strict recovery KPI
Target output: Tighter and repeatable flotation feed
Setup: PE Jaw -> dual PY Cone -> high-control screening
Why this works
- Highest stability for recovery-focused plants.
- Reduces upset frequency during blend transitions.
- Suitable when recovery penalties are material.
Mongolia lead-zinc route comparison
| Metric | Reliability-first | Balanced | High-control |
|---|---|---|---|
| Best for | Startup and logistics-heavy phases | Steady medium-scale operation | Recovery-critical operation |
| Feed consistency | Medium | High | Highest |
| Operational complexity | Low | Medium | Medium-high |
| Main risk | Limited upside under strict recovery target | Needs tuning discipline | Higher governance requirement |
| Winter resilience | High | Medium-high | Medium |
Blend Discipline Matters More Than Extra Hardware
Plants that document blend class and corresponding settings usually outperform plants that rely on operator memory and frequent manual changes.
Before investing in new stage additions, make sure blend governance and shift handover standards are stable.
- Define blend classes with clear setpoint windows.
- Use one-page handover checklist every shift.
- Track feed variance and flotation recovery in same report.
- Escalate repeated manual overrides to engineering review.
Procurement Questions That Reduce Rework
Request capacity and feed-size stability data under at least two blend scenarios. Single-scenario claims are usually misleading.
Ask suppliers to provide winter maintenance assumptions and required spare strategy explicitly.
RFQ checklist before you contact suppliers
- Defined blend scenarios for technical proposal basis.
- Target top-size variance before grinding.
- Seasonal maintenance and spare constraints.
- Power-event response assumptions.
- Commissioning test plan across blend classes.
- Flotation-feed acceptance KPIs and tolerance.
Need a model recommendation for your project?
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Related Buyer Q&A
For procurement-focused answers beyond this country case, review these Q&A topics.