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Screen metallic gold analysis Analytical results can be difficult to reproduce using typical sample reduction and fire assay procedures when coarse grained metallic gold is present. To address this, the sample can be analyzed using the screened metallics sample preparation and assaying procedure. This consists of: • Screening 500g/1000g or client specified weight of the sample to a defined grain size, typically 75, 106 or 212 microns • Weighing the various fractions • Assaying the entire plus fraction • Analyzing the undersize (typically in duplicate) • Calculating and reporting of size-fraction weights, coarse and fine fraction gold content and total gold content • The finish technique may involve AAS, ICP-OES or gravimetric, depending upon concentration. Limits shown are based on instrument analysis. Gravimetric limits are higher, please contact your SGS customer service agent Note: This technique requires a minimum sample of 500g. This technique can also be used for coarse grained native metals such as platinum, palladium, silver and copper.
GOLD IN CARBON CODE GC FAA01V100 GC ACA22D100V
ELEMENT
LIMIT(S)
DESCRIPTION
Au Au Au
5 - 20,000 ppm 5 - 250,000 ppm
1 - 2 g, Fire assay, AAS finish 1 g, Ash, acid digest, AAS finish 1 - 2 g, Fire assay, gravimetric finish
≥ 7.5 ppm
GC_FAG01V
GOLD BULLION CODE GC_BUL36V
ELEMENT
LIMIT(S)
DESCRIPTION
Au
0.5 - 99.5%
100 - 500 mg, Fire assay, gravimetric finish
Silver
EXPLORATION GRADE ANALYSIS ACID DIGESTION - INSTRUMENTATION CODE
ELEMENT
LIMIT(S)
DESCRIPTION
GE_AAS22E50 GE_AAS33E50
Ag Ag Ag
0.3 - 100 ppm 0.3 - 100 ppm 0.3 - 100 ppm
2 g, 2-Acid digest, AAS finish 2 g, 3-Acid digest, AAS finish
GE_AAS42E50 2 g, 4-Acid digest, AAS finish It is recommended that mineralized samples with Ag >30 ppm are analyzed using the GO_AAS21C50 method below. Silver (Ag) can also be analyzed in many multi-element packages.
SCREENED METALLICS CODE
ELEMENT
LIMIT(S)
DESCRIPTION
ORE-GRADE ANALYSIS ACID DIGESTION - INSTRUMENTATION CODE ELEMENT
≥ 0.01 ppm
GO_FAS30K
Au Ag Au Ag Au Ag Au Ag Au Ag Au Ag
Au, Ag, screen metallics* (75/106/212), 30 g. Fire assay
≥ 10 ppm
AAS/ICP/Gray, 500g
LIMIT(S)
DESCRIPTION
≥ 0.01 ppm
GO_FAS50K
Au, Ag, screen metallics* (75/106/212), 50 g. Fire assay
≥ 10 ppm
Ag
1 - 300 ppm
0.5 g, 2-Acid digest, AAS finish
GO_AAS21C50
AAS/ICP/Gray, 500g
≥ 0.01 ppm
GO_FAS30M
Au, Ag, screen metallics* (75/106/212), 30 g. Fire assay
≥ 10 ppm
GRAVIMETRIC ANALYSIS CODE
AAS/ICP/Gray, 1000g
≥ 0.01 ppm
GO_FAS50M
Au, Ag, screen metallics* (75/106/212), 50 g. Fire assay
ELEMENT
LIMIT(S)
DESCRIPTION
≥ 10 ppm
AAS/ICP/Gray, 1000g
Au Ag Au Ag Au Ag
0.01 - 100 ppm 10 - 10,000 ppm 0.5 - 10,000 ppm 10 - 10,000 ppm 0.01 - 100 ppm 10 - 10000 ppm
30 g, Fire assay, AAS finish (Au) gravimetric finish (Ag)
GO_FAG32V
≥ 0.01 ppm
GO_FAS30V
Au, Ag, screen metallics* (75/106/212), 30 g. Fire assay
≥ 10 ppm
AAS/ICP/Gray, >1000g
30 g, Fire assay, gravimetric finish (Au, Ag)
GO_FAG33V
≥ 0.01 ppm
GO_FAS50V
Au, Ag, screen metallics* (75/106/212), 50 g. Fire assay
≥ 10 ppm AAS/ICP/Gray, >1000g * options for screen sizes available. Pt, Pd can be added. Finish technique is based on concentration.
50 g, Fire assay, AAS finish (Au), gravimetric finish (Ag)
GO_FAG52V
PROCESS CONTROL AND CONCENTRATE-GRADE ANALYSIS INSTRUMENTAL AND GRAVIMETRIC ANALYSIS CODE ELEMENT LIMIT(S)
CONTROL AND CONCENTRATE-GRADE ANALYSIS INSTRUMENTAL AND GRAVIMETRIC ANALYSIS CODE ELEMENT
DESCRIPTION
GC_FAA30V10/FAA50V10
Au Au Au
0.01 - 1,000 ppm 0.01 - 1,000 ppm
30/50 g, Fire assay, AAS finish 30 g, Fire assay, AAS finish (Au)
LIMIT(S)
DESCRIPTION
GC_FAG32V GC_FAG33V
Ag Au Ag Au Ag Ag Ag
1 - 1,000 ppm
Variable wt, 4-acid digest, AAS finish
GC_AAS43V100
≥ 0.5 ppm
30 g, Fire assay, gravimetric finish (Au)
0.01 - 1,000 ppm
30 g, Fire assay, AAS finish (Au) gravimetric finish (Ag)
GC_FAG32V
≥ 10 ppm ≥ 0.5 ppm ≥ 10 ppm
GOLD IN PROCESS SOLUTIONS CODE
30 g, Fire assay, gravimetric finish (Au, Ag)
GC_FAG33V
ELEMENT
LIMIT(S)
DESCRIPTION
≥ 0.01 mg/L ≥ 0.01 mg/L
GC_FSA84T GC_FSI84T*
Au Au
Solution, Fire assay, AAS finish Solution, Fire assay, ICP-OES finish
2 - 2,000 ppm 0.01 - 99.5%
Carbon, 1 g, ash, acid digest, extract, AAS finish 100-500 mg, Fire assay, gravimetric finish
GC_ACA22D100V
GC_BUL36V
These methods are also applicable to cyanide liquors. * Pt and Pd can be added to GC_FSI84T.
GOLD IN CYANIDE LIQUORS CODE
ELEMENT
LIMIT(S)
DESCRIPTION
≥ 0.05 mg/L ≥ 0.001 mg/L
GC_AAS82T GC_AAS82X
Au Au
CN solution, AAS finish
Solvent extraction, DIBK, AAS finish
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