Gold by Fire Assay
An optimal fire assay flux recipe and rigorous quality control program easily handle problem materials including chromite, base metal sulfides and oxides, selenides, and tellurides. Choice of crushing fineness, splitting technique and pulp size can all affect the analytical outcome of fire assay gold methods. Discuss with your local ALS laboratory for more information.
Pricing and codes: Fee Schedule CAD - USD - EUR - AUD (p 16)
Metallic Screening
When samples contain coarse gold, the metallic screening procedure is recommended for accurate results.
Pricing and codes: Fee Schedule CAD - USD - EUR - AUD (p 16)
Silver
Trace level and low-grade silver samples may be analyzed by acid digestion for maximum sensitivity and precision. Multi-element packages including Ag are listed in the Targeted Exploration section. Because silver can suffer from nugget effect, occasional duplicate analysis may help detect sampling error at these low levels. At higher grades, fire assay with larger nominal weights may be preferable.
Pricing and codes: Fee Schedule CAD - USD - EUR - AUD (p 16)
Super Trace Gold in Soils & Sediments
ALS offers the lowest detection limits in the industry for gold in soils and sediments by both cyanide and aqua regia digestion, using our innovative super trace analytical methodology. Full multi-element geochemical suites may be read from the same digest solution as our aqua regia and ICP-MS super trace gold method. This package mirrors our ME-MS41L method, with slight adjustments made to accommodate the larger nominal sample weight necessary for representative gold analysis.
Pricing and codes: Fee Schedule CAD - USD - EUR - AUD (p 18)
Bulk Leach Extractable Gold
BLEG is used where cyanide leaching from a stream sediment sample may detect gold anomalies that would otherwise go unnoticed.
Pricing and codes: Fee Schedule CAD - USD - EUR - AUD (p 18)
Platinum Group Elements
Platinum, palladium, rhodium and gold may be determined by standard lead oxide collection fire assay and ICP-MS or ICP-AES finish. For the full list of platinum group elements, nickel sulfide collection fire assay must be used for a quantitative analysis.
Pricing and codes: Fee Schedule CAD - USD - EUR - AUD (p 17)
Gold Cyanidation
In mining and exploration applications, cyanide leach tests are used to establish the potential cyanide extraction efficiency for gold and silver.
Pricing and codes: Fee Schedule CAD - USD - EUR - AUD (p 17)
Process Samples
Includes gold in cyanide liquors or captured on activated carbon. Minimum sample weight required varies, contact your local lab.
Pricing and codes: Fee Schedule CAD - USD - EUR - AUD (p 17)
Precious Metals in Concentrates and Bullion
High precision analysis and umpire assay of precious metals in concentrates and bullion are performed by the most senior fire assay technicians and checked by certified assayers to ensure accuracy. Minimum sample weight required varies, contact your local lab.
Pricing and codes: Fee Schedule CAD - USD - EUR - AUD (p 17)
Low Level Gold in Soils & Sediments
Our trace level methods by aqua regia digestion and ICP-MS finish are excellent for regolith, where gold anomalies indicating mineralization below surface are well-characterized. Aqua regia dissolves native gold as well as gold bound in sulfide minerals; however, depending on the composition of the soil, gold determined by this method may or may not match recovery from fire assay methods. As with our super trace methods, multi-element packages can be read from the same digestion solution as trace level gold for a complete exploration tool.
Pricing and codes: Fee Schedule CAD - USD - EUR - AUD (p 19)