Screen Fire Assay

 

This method is typically used to analyse samples containing "coarse" gold particles. One kilogram of the sample is screened through a 150µm sieve. The +150µm portion (including the sieve cloth), is analysed by Fire Assay to determine the coarse gold content. The -150µm portion is analysed in duplicate by Fire Assay to determine the non-coarse gold content. A weighted average is then calculated to determine the overall gold content of the entire 1 kilogram sample.

The following results will be reported for a Screen Fire Assay:

Total weight of sample	Reported in Grams
Weight of +150 µm material	Reported in Grams
Gold value of +150µm portion	Detection Limit = 1ppb
Duplicate Gold values of -150µm portion	Detection Limit = 1ppb
Weighted Average Gold result	Detection Limit = 1ppb

 

Method Code : SFA01 utilises a 150µm sieve cloth.
Method Code : SFA02 utilises a 100µm sieve cloth.

Note : The above procedures can also be carried out using the Aqua Regia digest instead of Fire Assay.

 

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