Precious Metals

Precious Metals

MinAnalytical offers a range of analytical options for accurate precious metals analysis including lead collection fire assay and aqua regia digestion. These options are dependent on the nature of the sample and application required – whether low level greenfields exploration or accurate resource development.

Precious Metals

Fire Assay

Lead collection fire assay using specially formulated flux to accommodate a variety of sample matrices. Some reduction in sample charge weight may be required to fuse difficult sample matrices.

Description Element Detection Limits Code
25g fire assay AAS Au 0.01 – 100ppm FA25AAS
50g fire assay AAS Au 0.005 – 100ppm FA50AAS
25g fire assay AAS (Ore grade) Au 80 – 800ppm FA25HAAS
25g fire assay ICP-MS Au 1ppb FA25MS1
25g fire assay ICP-MS Pt, Pd 1ppb FA25MS2
25g fire assay ICP-MS Au, Pt, Pd 1ppb FA25MS3
50g fire assay ICP-MS Au 1ppb FA50MS1
50g fire assay ICP-MS Pt, Pd 1ppb FA50MS2
50g fire assay ICP-MS Au, Pt, Pd 1ppb FA50MS3

Screen Fire Assay

The screen fire assay method is typically used to analyse samples containing coarse Gold. A nominal 1kg of sample is split from the bulk pulp and re-pulverized to ensure the oversize portion is not excessive. The sub-sample is then screened through the nominated screen cloth. The entire coarse fraction (including the screen cloth) is fired. The fine fraction is analysed in duplicate by fire assay. A weighted average is then calculated to determine the total Gold content for the sample.

Allowance for one coarse fraction fire has been included in the standard pricing, extra costs are incurred for each additional coarse fraction fire.

Description Element Detection Limits Code
150µm screen fire assay AAS Au 0.01ppm SF150AAS
100µm screen fire assay AAS Au 0.01ppm SF100AAS
75µm screen fire assay AAS Au 0.01ppm SF75AAS
Additional oversize fire     SFPSAAS

Aqua Regia Digest

Aqua regia is generally used for low level Au analysis for exploration programs. A range of multi-elements are also available when using this digest which make this a very cost effective option. Aqua regia can digest many different mineral types including most oxides, sulphides and carbonates but will not totally digest refractory or silicate minerals. Aqua regia is ideal for exploration applications but should not be used for resource estimations.

Description Element Detection Limits Code
10g aqua regia with ultra-low ICP MS finish Au 0.1ppb AR10UMS
10g aqua regia with ICP MS finish Au 1ppb AR10MS
10g aqua regia with standard ICP MS finish Au 0.01ppm AR10HMS
25g aqua regia with ultra-low ICP MS finish Au 0.1ppb AR25UMS
25g aqua regia with ICP MS finish Au 1ppb AR25MS
25g aqua regia with standard ICP MS finish Au 0.01ppm AR25HMS

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