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Page: Metal Value per Tonne - How You Can Determine the Mineral Value per Tonne

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Metal Value per Tonne - How You Can Determine the Mineral Value per Tonne

The metal value gives you an idea about the potential profitability of a mineral project. By calculating the metal value and then deducting the (estimated) mining costs you get an insight into the viability of bringing this mineral project into production - at current metal prices.

An indication of the current mineral value of the rocks can be found by using Kitco's Rock Calculator. As you can see in the image below you can choose between different variables in the column Units/Weight depending on how the drill results are reported (%, grams / tonne, ounces / tonne and pounds / tonne).

You can click on the image link below after which you will be redirected to the specific subpage on Kitco's website:

images/Kitco_What-is-that-Rock-Worth_Rock-Calculator_85pct.JPG

To find out where you can find the prices for the minerals not mentioned in Kitco's Rock Calculator, I refer you to the note at the bottom of this page.

As it depends on the mining company if it reports its drill results in grams per tonne or ounces per tonne, I recommend that you remember the number 0.029, as you will be needing this number to convert troy ounces into grams. On the break even analysis page, I stated that 1 troy ounce equals 31.103481 grams per ton, which equals 34.2857 grams per tonne. As 1 gram equals 0.0321492 troy ounces, the conversion factor is calculated as: 0.0321492 / 34.2857 x 31.103481 = 0.0291652 (rounded 0.029).

Thus, when a mining company reports a drill result of 0.145 ounces per tonne, you now know that this equals (0.145 / 0.029 =) 5 grams per tonne. Conversely, when a mining company reports a drill result of 10 grams per tonne, you now know that this equals (10 x 0.029 =) 0.29 ounces per tonne.

On the break even analysis page, I also explained how you can convert a drill result reported in a percentage (%) to an amount in pounds (lbs) per tonne. You will find this explanation under the header How to Calculate the Cut-Off Grade, but in summary: 1% equals to 22 pounds.

How To Calculate the Metal Value per Tonne

In the following table, I have created some examples for calculating the metal value, using the metal prices from March 23, 2012 from the Kitco image above.

Drill Result  Calculation  Metal Value per Tonne 
2% Copper  2 (percent) * 22 (percentage to pounds) * $3.82 (copper price per pound)  $168.08 
1.8% Nickel  1.8 (percent) * 22 (percentage to pounds) * $8.30 (nickel price per pound)  $328.68 
1.14 g/t Gold  1.14 (gram per tonne) * 0.029 (gram to troy ounces) * $1649.80 (gold price per ounce)  $54.54 
70 g/t Silver  70 (gram per tonne) * 0.029 (gram to troy ounces) * $31.67 (silver price per ounce)  $64.29 

Although mineral values are often expressed in tonne, sometimes they are expressed by ton as well. As 1 ton equals 907.18474 kilograms and 1 tonne equals 1,000 kilograms, just remember the difference between tonne and ton is approximately 10% (mnemonic: less letters, less outcome).

For more information about how to calculate the metal value of a deposit as a whole, I recommend you to read the mineral deposit value page too.

 

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Note: You can use the commodity charts on UndervaluedEquity.com to find a more complete coverage of the available base metals prices, energy prices, fertilizer prices and precious metals prices.

 

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