The metal value provides an idea of the potential profitability of a mineral project. By calculating the metal value and then deducting the estimated mining costs, you gain 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 using the *Advanced Drill Hole Interval Calculator* which can be found on the website of the Junior Mining Network.

As it depends on the mining company whether it reports its drill results in *grams per tonne or ounces per tonne*, **remember the number 0.029**, as you will need this to __convert troy ounces into grams__. On the break even analysis page, it is stated that 1 troy ounce equals 31.103481 grams per __ton__, which equals 34.2857 grams per __tonne__. Since 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, there is also an explanation of **how to 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 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 perpound) |
$168.08 |

1.8% Nickel | 1.8 (percent) * 22 (percentage to pounds) * $8.30 (nickel price perpound) |
$328.68 |

1.14 g/t Gold | 1.14 (gram per tonne) * 0.029 (gram to troy ounces) * $1649.80 (gold priceper ounce) |
$54.54 |

70 g/t Silver | 70 (gram per tonne) * 0.029 (gram to troy ounces) * $31.67 (silver price perounce) |
$64.29 |

Although mineral values are often expressed in __tonnes__, sometimes they are expressed by __tons__ 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, lower outcome*).

For more information on how to calculate the **metal value of a deposit as a whole**, I recommend you to read the mineral deposit value page as well. This will provide you with a comprehensive understanding of the process and various factors to consider when *estimating the value of an entire mineral deposit*.