Tools
Calculators built for real mining decisions
Everything you can actually use — purity, grade, tonnage, cost and unit tools, ready in the field or the office. No sign-up.
Estimator
Plan the whole project
For full stage-by-stage profit modelling — tonnage, grade, recovery, haulage, chemicals, refining and overheads — use the Exploration Estimator.
Exploration Estimator
Build a complete gold project from material to sale and watch the profit recalculate live as you change every input.
01
Estimation & Economics
Turn grade, tonnes and costs into revenue, margin and payback.
Grade, Recovery & Revenue
Turn ore grade, tonnage and recovery into contained gold, recovered metal and revenue.
- Contained gold
- 250 kg
- Contained ounces
- 8,037.7 oz
- Recovered ounces
- 7,394.7 oz
- Gross revenue
- USD 17,747,212.11
Mining Cost Calculator
Processing economics: recoverable gold, gross revenue, processing costs and margin per tonne.
- Recovered ounces
- 7,394.7 oz
- Revenue
- USD 17,747,212.11
- Operating cost
- USD 2,800,000
- Royalty
- USD 1,242,304.85
- Operating margin
- USD 13,704,907.26
- Cash cost
- USD 546.65/oz
- Break-even grade
- 0.42 g/t
Indicative economics only — excludes capital, financing, tax and depreciation.
02
Gold
Purity, weight and value for doré, concentrate and refined metal.
Gold Purity Calculator
Convert between karat, fineness and percent purity, with the actual fine-gold content.
- Karat → purity
- 75 %
- Karat → fineness
- 750
- Purity → karat
- 18 K
- Purity → fineness
- 750
24K100% · 1,000 fine
22K91.67% · 917 fine
21K87.5% · 875 fine
18K75% · 750 fine
14K58.33% · 583 fine
10K41.67% · 417 fine
9K37.5% · 375 fine
Gold Value Calculator
Gold weight in grams or troy ounces priced at the spot value you set.
- Grams
- 31.1035
- Kilograms
- 0.031103
- Troy ounces
- 1
- Pennyweight
- 20
- Fine gold content
- 31.1035 g
- Value at price
- USD 2,400
03
Material & Grade
Assay units, tonnage and density — the inputs every estimate depends on.
Grade Converter
g/t, ppm and oz/t grade conversions for assays and reports.
- ppm (parts per million)
- 2.5
- ppb
- 2,500
- Percent
- 0.00025 %
- Troy oz per tonne
- 0.08038
- Troy oz per short ton
- 0.07292
- g per kg
- 0.0025
For gold and most metals, 1 g/t = 1 ppm. 1% = 10,000 ppm.
Volume & Tonnage Calculator
Length × width × depth to volume, then to tonnes using specific gravity.
- Volume
- 5,000 m³
- Volume
- 6,539.75 yd³
- Tonnage
- 13,000 t
Density Calculator
Mass ÷ volume — the SG input the tonnage and estimator tools rely on.
- Density
- 2,600 kg/m³
- Density
- 2.6 t/m³ (SG)
- Density
- 2.6 g/cm³
Reference: quartz 2.65 · granite 2.70 · sulphide ore 3.0–4.5 · gold 19.3 g/cm³.
04
Unit Converter
Every conversion you need on site, in one place.
Weight Calculator
Kilograms, grams, tonnes and troy ounces — including the precious-metals troy ounce.
- troy ounce
- 32.150747
gram1,000
kilogram1
tonne0.001
milligram1,000,000
troy ounce32.1507
ounce35.274
pound2.2046
short ton0.0011
long ton0.001
carat5,000
pennyweight643.0149
Troy ounce (31.1035 g) is used for precious metals; ounce (28.3495 g) is avoirdupois.
Area Calculator
Hectares, acres, square metres and licence-block area units.
- acre
- 2.471054
square metre10,000
hectare1
acre2.4711
square kilometre0.01
square foot107,639.1042
square yard11,959.9005
square mile0.0039
Distance Converter
Metres, kilometres, miles, feet and haul-road distances.
- mile
- 0.621371
metre1,000
kilometre1
centimetre100,000
millimetre1,000,000
mile0.6214
yard1,093.6133
foot3,280.8399
inch39,370.0787
nautical mile0.54
Volume Converter
Cubic metres, litres, cubic yards, gallons and barrels.
- litre
- 1,000
cubic metre1
litre1,000
cubic centimetre1,000,000
cubic yard1.308
cubic foot35.3147
US gallon264.1721
imperial gallon219.9692
barrel (42 gal)6.2898
Time Converter
Hours, shifts, days, weeks and months for production planning.
- hour
- 24
hour24
minute1,440
second86,400
shift2
day1
week0.1429
month0.0329
quarter0.011
year0.0027
A shift is taken as 12 hours; a month as 30.417 days.
Currency Converter
Live rates between TZS, USD and the currencies you trade in.
Loading live rates…
05
Quick Maths
Small calculations that come up every day.
Percentage Calculator
Recovery percentages, grade uplifts, cost shares and variances.
- Change
- 25 %
- Direction
- Increase
- Difference
- 25
- Original + 15%
- 115
- Original − 15%
- 85
- 15% of original
- 15
Ratio Calculator
Strip ratios, dilution, mixing ratios and scale factors.
- Ratio
- 12 : 4
- Simplified
- 3 : 1
- A as ratio to 1
- 3 : 1
- A share
- 75 %
- B share
- 25 %
- A gets
- 75
- B gets
- 25