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 by acid digestion (aqua regia) CODE
ELEMENT
LIMIT(S)
DESCRIPTION
GE_ARE1V50
Au Au
1 - 800 ppb
50 g, Aqua regia digest, DIBK extraction, AAS finish 25/50 g, Aqua regia digest, DIBK extraction, AAS finish
0.01 - 100 ppm
GE_ARE2V25/ARE2V50
GE_ARMV25/ARMV50
1 - 500 ppb
25/50 g, Aqua regia digest, ICP-MS finish
Au*
*Additional elements are available on request Cyanide leach procedures are used to enhance small gold anomalies during exploration and to monitor gold extraction efficiencies in metallurgical applications. Bulk Leach Extractable Gold (BLEG) is a cyanide-based partial leach procedure that uses a large sample size (0.5 kg to 5 kg). It is used to enhance small gold anomalies during exploration. The cyanide leachate solution is extracted into an organic solvent and analyzed. Our active cyanide leach packages are available with a variety of sample sizes, detection limits and finishing methods. The mini
cyanide leach package is available for smaller sample sizes, allowing for faster TAT than active cyanide leach. Other elements are also partially extracted with the cyanide leach and can be measured on request.
Cyanide extractable gold CODE
ELEMENT
LIMIT(S)
DESCRIPTION
Au Au Au
0.03 - 100 ppm 0.03 - 100 ppm 0.01 - 100 ppm
Hot, 30 g, Mini cyanide leach, AAS finish Cold, 30 g, Mini cyanide leach, ICP finish
GE_MBLA65V30 GE_MBLI64V30
GE_BLE61K
500 g, Active cyanide leach, Solvent extraction, AAS finish
Screened metalics CODE
GE_BLE61NL
1 - 10,000 ppb
2000 g, Active cyanide leach, Solvent extraction, AAS finish
Au
ELEMENT LIMIT(S)
DESCRIPTION
Au Ag Au Ag Au Ag Au Ag Au Ag Au Ag
GO_FAS30K
≥ 0.01 ppm ≥ 10 ppm ≥ 0.01 ppm ≥ 10 ppm ≥ 0.01 ppm ≥ 10 ppm ≥ 0.01 ppm ≥ 10 ppm ≥ 0.01 ppm ≥ 10 ppm ≥ 0.01 ppm ≥ 10 ppm
Au, Ag, screen metallics* (75/106/212), 30 g. Fire assay AAS/ICP/Gray, 500g Au, Ag, screen metallics* (75/106/212), 50 g. Fire assay AAS/ICP/Gray, 500g Au, Ag, screen metallics* (75/106/212), 30 g. Fire assay AAS/ICP/Gray, 1000g Au, Ag, screen metallics* (75/106/212), 50 g. Fire assay AAS/ICP/Gray, 1000g Au, Ag, screen metallics* (75/106/212), 30 g. Fire assay AAS/ICP/Gray, >1000g Au, Ag, screen metallics* (75/106/212), 50 g. Fire assay AAS/ICP/Gray, >1000g
The Leachwell™ tab is a proprietary product and Leachwell™ is a patented process. Accelerated cyanide leach techniques are used to determine bulk leachable gold in exploration samples using modified cyanide leach (Leachwell™). The large sample is mixed with water and Leachwell™ tabs and tumbled. The gold is extracted into DIBK and analyzed. Other elements (Cu, Ag, Pb and Zn) are also partially extracted by the cyanide leach and can be measured on request.
GO_FAS50K
GO_FAS30M
Accelerated cyanide leach for gold CODE
GO_FAS50M
ELEMENT
LIMIT(S)
DESCRIPTION
Au Au Au Au Au
0.01- 1,000 ppm 0.01- 1,000 ppm 0.01- 1,000 ppm
200 g, Accelerated cyanide leach, AAS finish 500 g, Accelerated cyanide leach, AAS finish 800 g, Accelerated cyanide leach, AAS finish
GE_LWE69J GE_LWE69K GE_LWE69L GE_LWE69M GE_LWE69N
GO_FAS30V
GO_FAS50V
0.01- 1,000 ppm 1000 g, Accelerated cyanide leach, AAS finish 0.01- 1,000 ppm 2000 g, Accelerated cyanide leach, AAS finish
*options for screen sizes available. Pt, Pd can be added. Finish technique is based on concentration.
These methods are also available with ICP-MS finish.
ORE-GRADE ANALYSIS
Instrumental and gravimetric analysis CODE
ELEMENT
LIMIT(S)
DESCRIPTION
Au Au
0.01- 100 ppm 0.01- 100 ppm 0.01- 100 ppm 0.5 - 10,000 ppm 0.01- 100 ppm
30/50 g, Fire assay, AAS finish 30/50 g, Fire assay, MP-AES finish 30/50 g, Fire assay, ICP-OES finish 30/50 g, Fire assay, gravimetric finish 30/50 g, Fire assay, AAS finish (Au) gravimetric finish (Ag)
GO_FAA30V10/FAA50V10 GO_FAP30V10/FAP50V10 GO_FAI30V10/FAI50V10 GO_FAG30V/FAG50V
Au **
Au Au
GO_FAG32V/FAG52V
GO_FAG33V
Au Ag
0.5 - 10,000 ppm 30 g, Fire assay, gravimetric finish (Au, Ag)
GO_FAG32V/FAG52V/FAG33V
10 - 10,000 ppm
**Pt and Pd can be included.
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