Vietnam: Method for determination of actual solid mineral mining output

According to Circular No. 61/2017/TT-BTNMT of the Ministry of Natural Resources and Environment of Vietnam, depending on types of solid minerals which have been extracted, the actual mining output thereof shall be determined as follows:

Where there is none of waste aggregates and accompanying minerals which are produced from extraction activities at a mine, the actual mining output is defined as the arithmetic mean of output values calculated based on the following data sources:

- Output data acquired from the direct measurement of the amount of mine aggregates carried out at mining positions, based on current state maps and cross-sections of mining sites. 

- Output data derived from statistics and compilation of those recorded in books used for specific mining stages (e.g. shoveling and transportation, etc.).

- Output date determined according to limits for consumption of raw materials and fuels, and based on the general statistics of documents evidencing consumption of raw materials, fuels and industrial explosives (if any) in the calculation year.

- Output data which are selected and obtained from invoices and financial evidencing documents available in the calculation year, and in which the general loss factor is taken into account. 

Where there are waste aggregates and accompanying minerals which are produced from extraction activities at a mine, the actual mining output is defined as the arithmetic mean of output values calculated based on the following data sources:

- Output data derived from statistics and compilation of those recorded in books storing data and information about earthworks and site preparations and specific mining stages (e.g. shoveling and transportation, etc.).

- Output data derived from statistics and compilation of those recorded in books storing data and information about minerals undergoing screening, sieving, separation and enrichment (if any) stages.

- Output date determined according to limits for consumption of raw materials and fuels, and based on the general statistics of documents evidencing consumption of raw materials, fuels and industrial explosives (if any) in the calculation year.

- Output data which are selected and obtained from invoices and financial evidencing documents available in the calculation year, and in which the general loss factor is taken into account. 

Notably, deviation of data of actual mining output determined at specific mining stages; data determined in relation to specific data sources shall not, in comparison with each other, exceed the normal loss factor (expressed in %) which is defined according to the approved mine design. In particular, volume of waste aggregates and actual mining output of major minerals and accompanying minerals must be statistically reported and enumerated on a separate basis.

View details at Circular No. 61/2017/TT-BTNMT of the Ministry of Natural Resources and Environment of Vietnam, effective from March 07, 2018.

-Thao Uyen-

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