So what is fire assay, exactly? Fire assay is a specific process used by scientists and researchers to determine the content of gold, silver, or other precious metals in a sample. This method had been used thousands, thousands -- maybe even hundreds -- of years. That being said, it is still one of the best and most accurate methods to test for these precious metals. Just think of it as a really powerful detective that shows what’s inside of rocks or other materials!
Step 1 — Prepare the Sample First, you need the sample that you would like to test. It could be a rock or dirt. You will smash this sample into tiny particles. So you add some chemicals to the mix. It smooths your path and gets you higher quality results.
Melt the Sample: The next step is to place the sample into a furnace to melt it. A furnace is a special type of oven that can get very hot. You heat the sample until it melts and transforms into a liquid. This is very important because you need the sample in a liquid state to be able to see the metals.
There’s now metal: Once the sample is melted, you’re going to add some other chemicals. All these chemicals isolate the metal of interest from the other components of the sample. Describe how it is like using a magnet to extract metal pieces from sand!
Measure properly: This is very important to measure everything and do it properly. Use the appropriate tools to get accurate measurements (i.e. scales, measuring cups, etc). The more meticulous you are, the better your outcomes will be!
Keep your tools clean: Dirt or mess on your tools can alter the results. So the best option is to keep everything clean. Be sure to keep your tools clean and your space organized so you can work efficiently.
Sample damage by overheating: One of the most serious fears in most cases is that when you heat your sample too much, you actually destroy the metal that you aim to test. You have to watch the temperature though!
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