At Aurum Laboratories, we specialise in gold analysis using the fire assay method.
Fire Assay is one of the most trusted and precise techniques for determining the gold content in geochemical samples. This time-tested method ensures highly accurate results, making it the preferred choice for mining, exploration, and metallurgical industries.
What is Fire Assay?
Fire assay is a precise, multi-step process used to extract and quantify precious metals, particularly gold.
This process involves fusing the sample with a flux to extract the precious metals, which are then further refined for analysis.
It is known for its exceptional accuracy, even in complex geochemical matrices.
The Fire Assay Process
At Aurum Laboratories, our gold analysis through fire assay consists of four key stages:
Fluxing
Each sample is carefully weighed and mixed with a specialised flux containing litharge (lead oxide), soda ash, borax, or other reagents depending on sample types. This mixture helps to separate the gold from the surrounding material during the melting process. Additional reagents can be added to ensure optimal extraction for samples with complex matrices (such as sulphides or carbon).
Firing and Pouring
The prepared samples are placed into a gas-fired furnace at temperatures ranging between 1050°C and 1100°C. During this stage, the flux reacts with the sample, creating a molten mixture. The precious metal content settles into a lead button, which is then carefully poured into moulds for further refinement.
Knocking Up
Once the molten material cools, the lead button is separated from the slag. Any residual glass or impurities are removed to ensure a clean sample for the final stage.
Cupellation
The extracted lead buttons are placed in a cupellation furnace at 930-950°C, where the lead is oxidised and absorbed by a porous cupel, leaving behind a small prill containing gold and silver. This prill is then further analysed to determine the gold content with high precision.
Why Choose Aurum Laboratories for Fire Assay?
- Accuracy and Reliability - Fire assay is one of the most precise methods for gold analysis, providing consistent and repeatable results.
- State-of-the-Art Equipment - Our lab is equipped with advanced technology, ensuring efficient and high-quality analysis.
- Industry Expertise - With years of experience in geochemical analysis, our team ensures that each step of the fire assay process is conducted with precision and care.
- Custom Solutions - Whether you require analysis for exploration, mining, or refining purposes, we tailor our fire assay procedures to meet your needs.
