Metallurgical recovery rate measures the proportion of contained metal in processed ore that is recovered by the processing circuit into concentrate, doré, or another saleable intermediate product under the stated methodology.
A simplified formula is:
1Recovery Rate
2= Recovered Metal ÷ Contained Metal in Process FeedRecovery connects grade to output
Ore Grade tells investors how much metal is contained in the feed. Recovery tells them how much of that metal the process captures.
A simplified output bridge is:
1Recovered Metal
2≈ Processed Tonnes × Feed Grade × Recovery RateIf one million tonnes are processed at 2.0 g/t gold with 90% recovery, recovered gold is approximately:
11,000,000 × 2.0 × 90%
2= 1,800,000 gramsbefore refining, payable-metal, and unit conversions.
Recovery is not grade
A high-grade ore body can still have weak economics if the mineralization is difficult to recover.
Likewise, a lower-grade deposit can support attractive production if throughput is high and recovery is strong.
Grade and recovery therefore solve different analytical problems and should not be collapsed into one measure.
Recovery is not payable percentage
For concentrate-producing mines, metallurgical recovery is also distinct from the payable percentage under smelter or refining terms.
The processing plant may recover metal into concentrate, but the miner can receive payment for less than 100% of the contained metal after treatment charges, refining charges, deductions, and contractual payability terms.
That means:
1Contained Metal
2→ Metallurgically Recovered Metal
3→ Payable / Sold Metalare separate stages.
What affects recovery
Recovery can change with:
- mineralogy;
- oxidation state;
- grind size;
- reagent dosage;
- residence time;
- plant configuration;
- ore blend;
- throughput rate;
- maintenance condition; and
- operating discipline.
A recovery change may therefore reflect feed characteristics rather than a simple improvement or deterioration in management execution.
Recovery and unit cost
When recovery falls, fewer saleable ounces can be produced from the same tonnes processed and much of the same fixed plant cost.
That can push Total Cash Cost and All-In Sustaining Cost higher per ounce even if total operating spending is stable.
The reverse can occur when recovery improves.
Heap leach versus mill recovery
Different processing routes can produce very different recovery profiles.
Heap-leach operations often trade lower recovery for lower processing intensity and lower capital or operating cost. Conventional milling, flotation, pressure oxidation, or other complex circuits may achieve higher recovery but require more capital and operating expense.
A higher recovery rate is therefore not automatically better economics unless process cost and capital intensity are considered as well.
Recovery estimates versus actual recovery
Technical studies use modeled recovery assumptions. Operating mines report realized or actual recovery under current feed and plant conditions.
Investors should keep those categories separate. A feasibility-study recovery assumption is not the same as demonstrated operating performance.
Filing examples
Dakota Gold's 2025 disclosures present gold and silver recovery rates alongside feed grade, tonnes processed, strip ratio, and project economics. The 2025 Hod Maden technical report summary similarly reports gold and copper grade together with metal-specific recovery rates.
Sources:
Bottom line
Metallurgical recovery rate is a processing-efficiency measure, not ore grade, payable percentage, or profit margin. Investors should pair it with feed grade, throughput, processing route, payability, and unit-cost disclosures before comparing mines.
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