1. Executive Overview
Rashmi Metaliks is evaluating an integrated lithium project in Zimbabwe involving the acquisition and validation of a lithium mine, construction of a spodumene concentration plant, and downstream conversion into lithium sulphate for export.
The project should be viewed as a linked value chain:
The project is strategically attractive because it gives exposure to critical minerals and battery supply chains while aligning with beneficiation requirements. However, it remains conditional and should not proceed to full EPC until mine grade, mineralogy, recovery, concentrate quality, export eligibility, and offtake are confirmed.
2. Integrated Project Investment Snapshot
Indicative project costs before final drilling, testwork, FEED, vendor quotations, and legal review.
Total Project Cost View
| Component | Indicative Cost | Comment |
|---|---|---|
| Mine acquisition | $0.8M | Initial entry or licence acquisition assumption |
| Mine validation | $2M–6M base case | Drilling, assays, legal, ESG, metallurgy, resource report |
| Spodumene concentration plant | $10M–20M target | Crushing, DMS/flotation, dewatering, tailings, utilities |
| Lithium sulphate plant | $40M–50M target | Calcination, acid roast, leaching, purification, crystallisation |
| Infrastructure, working capital, contingency | $8M–20M+ | Power, water, roads, inventory, owner costs, spares |
| Total Indicative Integrated Project | $60M–95M+ | Final cost depends on scope, vendor quotes, infrastructure, and test results |
3. Mine Validation: First Critical Gate
The mine must prove grade, mineralogy, tonnage, recovery potential, clean title, and mine life before plant investment.
Key Mine Validation Targets
| Parameter | Preferred Target |
|---|---|
| Lithium mineral | Spodumene-dominant |
| Average ore grade | ≥1.2% Li₂O preferred |
| Minimum acceptable grade | 1.0% Li₂O only if recovery and costs are strong |
| Mine life | 7+ years preferred |
| Beneficiation recovery | 70%+ preferred |
| Concentrate target | 5.5%–6.0% Li₂O |
| Legal title | Clean, transferable, verified |
| ESG feasibility | Water, land, community, and environmental route clear |
Minimum Mineable Ore Requirement
| Item | Base Assumption |
|---|---|
| Concentrate required for sulphate plant | 25,000 tpa |
| Concentrate grade | 6.0% Li₂O |
| Ore grade | 1.2% Li₂O |
| Recovery | 72% |
| Ore required per year | ~174,000 tpa |
| Target mine life | 7+ years |
| Minimum mineable ore target | ~1.2 million tonnes ore |
Mine Validation Decision
| Outcome | Decision |
|---|---|
| Grade ≥1.2% Li₂O, spodumene-dominant, 7+ year mine life, clean title | Proceed to concentration pilot and engineering |
| Grade 1.0%–1.2% Li₂O, recovery uncertain, or mine life short | Renegotiate, redesign, or continue validation |
| Grade below 1.0% Li₂O, non-spodumene ore, weak title, or poor recovery | Reject or pause project |
4. Spodumene Concentration Plant: Second Critical Gate
This stage upgrades mined ore into 5.5%–6.0% Li₂O concentrate for the lithium sulphate plant.
Beneficiation Process Route
Base Concentration Assumptions
| Item | Base Case |
|---|---|
| Ore feed | 174,000 tpa |
| Ore grade | 1.2% Li₂O |
| Concentrate output | 25,000 tpa |
| Concentrate grade | 6.0% Li₂O |
| Recovery | 72% |
| Mass yield | ~14.4% |
| Beneficiation opex | ~$38/t ore |
| Cost per tonne concentrate | ~$264/t concentrate |
Concentration Plant Decision Criteria
| Criterion | Minimum Requirement |
|---|---|
| Concentrate grade | 5.5%–6.0% Li₂O |
| Recovery | 70%+ preferred |
| Impurity profile | Acceptable iron, mica, fluorine, moisture, particle size |
| Tailings | Safe storage or dry-stack route |
| Water | Sufficient water supply and recycling plan |
| Downstream fit | Concentrate accepted by sulphate plant vendor |
5. Lithium Sulphate Plant: Third Critical Gate
Assumes lithium sulphate is accepted as a refined chemical product for export.
Lithium Sulphate Process Route
Base Financial Assumptions
| Item | Base Case |
|---|---|
| Lithium sulphate plant capex | $45M |
| Capex target range | $40M–50M |
| Concentrate feed | 25,000 tpa |
| Product output | ~5,000 tpa equivalent |
| Annual revenue | ~$22.5M |
| Base EBITDA | ~$9.0M |
| ROI on sulphate plant capex | ~20% |
| Payback on sulphate plant only | ~5 years |
Major Equipment
| Area | Main Equipment |
|---|---|
| Thermal | Dryer, calcination kiln, cooler, sulphation kiln |
| Chemical | Acid tanks, acid mixer, leach tanks, purification reactors |
| Separation | Thickener, filter press, clarifier, polishing filters |
| Product | Evaporator, crystalliser, centrifuge, dryer, bagging |
| Utilities | Power, boiler, water treatment, compressed air, lab, control room |
| Environment | Scrubbers, effluent treatment, residue handling, monitoring |
6. Integrated ROI and Payback View
The full project payback must include mine validation, concentration plant, sulphate plant, infrastructure, working capital, and contingency.
| Total Investment | EBITDA Required for 4-Year Payback | EBITDA Required for 5-Year Payback |
|---|---|---|
| $45M | $11.25M/year | $9.0M/year |
| $60M | $15.0M/year | $12.0M/year |
| $75M | $18.75M/year | $15.0M/year |
| $90M | $22.5M/year | $18.0M/year |
| $95M | $23.75M/year | $19.0M/year |
Economics Are Most Sensitive To
| Variable | Impact |
|---|---|
| Ore grade | Controls ore feed volume and concentration cost |
| Recovery | Controls concentrate output and lithium sulphate yield |
| Concentrate grade | Affects calcination, acid roast, and product quality |
| Product price | Major revenue driver |
| Acid and power cost | Major opex drivers for sulphate plant |
| Capex overrun | Can materially extend payback |
Investment Interpretation
A 5-year payback is achievable only if total project capex is controlled and annual EBITDA reaches approximately USD 12M–19M, depending on the final integrated investment size.
For a 4-year payback, the project would need approximately USD 15M–24M annual EBITDA. This requires strong grade, strong recovery, reliable plant uptime, and firm offtake pricing.
The original $15.8M ROI logic no longer applies once refined chemical export is required.
7. Main Project Risks
Critical risks that must be managed before major capital commitment.
| Risk | Why It Matters | Rating | Mitigation |
|---|---|---|---|
| Mine title risk | Invalid or disputed title can stop the project | Critical | Independent legal due diligence |
| Mineralogy risk | Non-spodumene ore may not fit the process | Critical | XRD, QEMSCAN, bulk sample testwork |
| Grade risk | Low grade increases ore feed and cost | Critical | Drilling, assays, resource modelling |
| Recovery risk | Low recovery reduces output and ROI | Critical | DMS/flotation and sulphate pilot tests |
| Concentrate quality risk | Impurities may affect sulphate plant and buyers | High | Impurity profiling and vendor testing |
| Offtake risk | Lithium sulphate has a narrower buyer base | Critical | Buyer qualification and binding offtake |
| Capex overrun | Can extend payback and reduce IRR | High | FEED, vendor quotes, contingency |
| Power and acid supply | Chemical processing needs stable utilities | High | Power study and acid logistics contracts |
| Environmental risk | Acid, tailings, emissions, and water require approvals | High | EIA, scrubbers, ETP, tailings plan |
| Market price risk | Lithium prices are volatile | Medium | Conservative price deck and offtake contracts |
8. Recommended Phased Development Plan
Phase 1: Mine and Legal Validation
Approx. $2M–6M validation budget
| Action | Purpose |
|---|---|
| Legal title verification | Confirm ownership and transferability |
| Drilling and assays | Confirm grade, tonnage, and continuity |
| Mineralogy testing | Confirm spodumene-dominant ore |
| ESG and water screening | Identify permitting blockers early |
Phase 2: Beneficiation Validation
Before concentration plant EPC
| Action | Purpose |
|---|---|
| Bulk sample collection | Representative test feed |
| DMS and flotation tests | Confirm concentrate grade and recovery |
| Dewatering and tailings study | Confirm water and residue route |
| Downstream feed test | Confirm sulphate plant compatibility |
Phase 3: Concentration Plant EPC
Indicative $10M–20M target
| Action | Purpose |
|---|---|
| Crushing and screening | Prepare ore for beneficiation |
| DMS / flotation plant | Produce 6% concentrate |
| Tailings and water circuit | Environmental and operating reliability |
| Concentrate quality control | Stable sulphate plant feed |
Phase 4: Lithium Sulphate FEED and Offtake
Indicative $40M–50M target capex
| Action | Purpose |
|---|---|
| FEED and vendor quotes | Confirm capex and guarantees |
| Acid and power supply plan | Secure critical utilities |
| Product qualification | Confirm buyer acceptance |
| Binding offtake | Reduce commercial risk |
9. Final Board-Level Recommendation
Recommended Decision
The integrated Zimbabwe lithium project should be classified as:
Potentially viable, strategically interesting, but conditional on validation and offtake
The board should approve staged validation work, not full capital commitment. The most important immediate action is to validate the mine and concentration performance before committing to the lithium sulphate plant.
| Minimum Condition Before Major Capex | Status |
|---|---|
| Clean mine title and licence transferability | Required |
| Spodumene-dominant ore | Required |
| Average grade preferably ≥1.2% Li₂O | Required |
| Mine life of at least 7 years | Required |
| 25,000 tpa of 5.5%–6.0% Li₂O concentrate | Required |
| Beneficiation recovery of 70%+ | Required |
| Concentrate accepted by sulphate process vendor | Required |
| Lithium sulphate export eligibility | Assumed Confirmed |
| Buyer qualification and binding offtake | Critical |
| Environmental and water approvals achievable | Required |