Ore processed / month
10,000 t
Gold unit converter
Instant conversion · Troy ounce (oz t), Gram (g), Kilogram (kg)
oz t
1 oz t
LBMA
g
31.10 g
SI
kg
0.031 kg
1 000 g
Standards:
Production parameters
Change the values to simulate a site.t/h
1 t/h100 t/h
Max 3 shifts
h/d
0.5 h24 h
h
13 h624 h
Planning assumption: 8h/shift · 26 operating days/month.
Daily equivalent rounded to 0.01 h; production uses monthly hours.
g/t
0 g/t20 g/t
%
0 %100 %
Important: Recovery rate is the share of contained gold recovered by the process. Ore grade is measured in grams per tonne (g/t). Confirm the selected recovery rate with metallurgical tests.
Calculated monthly production
9.00 kg Au
Recovered gold expressed as fine-gold equivalent · Theoretical estimate
Monthly production in troy ounces
289.36 oz t Au
Troy ounces (1 oz t = 31.1035 g) · International market reference
Contained gold / month
10.00 kg
Annualized production*
108.00 kg
Sensitivity to ore grade
At constant throughput, monthly hours and recovery.Monthly production table
Representative grades calculated with the selected operating parameters.| Grade (g/t) | Contained gold (kg/month) | Recovered gold (kg/month) | Recovered gold (kg/year)* |
|---|
Production equation
Complete mathematical breakdown of the monthly fine-gold recovery model.
General formula: Recovered gold (kg) = throughput (t/h) × hours (h) × grade (g/t) × recovery (%) ÷ 100 ÷ 1,000 · 1 troy ounce = 31.1035 g
1. Throughput
40 t/h
Washing plant processing capacity per operating hour.
2. Operating hours
250 h/mois
Net productive duration (≈ 9.62 h/d over 26 operating days).
3. Ore grade
1.0 g/t
Average in-situ or washed gold concentration per tonne.
4. Recovery
90 %
Net gravity recovery rate after sluicing/centrifuges.
Step 1
Ore tonnage processed
40 t/h × 250 h = 10 000 t
Throughput multiplied by monthly productive hours gives the total mass of gravel/ore fed to the plant.
Step 2
Total contained gold (in-situ mass before losses)
10 000 t × 1.0 g/t ÷ 1 000 = 10.00 kg
Mass of fine gold physically present in the gravel before processing (divided by 1,000 to convert grams to kilograms).
Step 3
Recovered fine gold (recovered production)
10.00 kg × 0.90 = 9.00 kg Au
Actual gold recovered by the concentration circuit, accounting for metallurgical recovery and tailings losses.
Step 4
Conversion to troy ounces (international market standard)
9.00 kg × 32.1507 = 289.36 oz t Au
Conversion into troy ounces (1 oz t = 31.1035 g), the universal unit used for LBMA spot quotations and bullion transactions.
Summary line: 40 t/h × 250 h × 1 g/t × 0.90 ÷ 1,000 = 9.00 kg (289.36 oz t)
* Arithmetic annualization over 12 identical months, without further adjustment for downtime, seasonality or availability. Enter productive hours and an average throughput that can realistically be achieved.
Results are the estimated mass of recovered fine gold. The weight of a raw doré bar depends on its composition and purity; no doré purity is assumed. These projections are not a reserve estimate, verified grade or production guarantee.
For alluvial operations, measure the grade of material actually sent to washing, distinguish waste from mineralized layers, and monitor gold losses in tailings.
Technical criteria & geological stages (Infographic guide)
Explore the 9 operational criteria and the 5-step exploration protocol to calibrate realistic grade, clay washing, and recovery rates.