Assays are tests to analyze the purity of precious metals. The process of analysis involves testing the quality and composition of the metals for clarity. The term also tests minerals and ores from the mining industry.
Metals should meet the delivery requirements of future market contracts, and they prove whether the metal fulfills the stringent purity and quality requirements set by future exchanges. Assays in the medicinal world aid in developing new drugs apart from the creation of new vaccines.
5 Types of Precious Metal Assays
There are four primary precious metals available on Earth- gold, platinum, palladium, and silver, and there are multiple types of assays for quality and component analysis of these metals.
Here are the top 5 types of metal assays that help to analyze the metals thoroughly.
Fire Gold Assaying
This process is a dry technique that the professionals perform on the ores by applying the furnace method. The basic plan of fire assaying of gold involves concentrating the precious metal in a lead button. The process can happen in two ways:
- Fire assay by fusion inside the crucible
- Fire assay applying scorification
You will obtain the button of lead in either of the above ways. You have to subject the button to cupellation for oxidizing the lead and removing it, leaving the gold portion.
The resulting bead of precious metal will reveal the actual weight. In such operations, metals of the platinum group and silver will remain with gold. Professionals apply parting and inquartation to separate these metals.
X-Ray Fluorescence Gold Assaying
This type of assaying is a portable process. The portable X-ray fluorescence machine can measure a maximum of 22 elements in each reading with competing for accuracy.
- The XRF assaying will be a non-destructive technique of testing.
- It takes only a few seconds to analyze a metal.
- No need to prepare a sample.
If you want faster delivery of results with accurate analysis of the elements apart from the karat amounts, you should opt for this type of assay.
Fire Assay
Fire assay is the most precise and popular method that specialists apply for the analysis of precious metals like gold. It is also called cupellation.
The process of fire assaying involves the separation of gold from impurities. The process involves melting the impure metal within a cupel, a porous flattened dish that is composed of a high-temperature resistant and refractory material.
The next step involves directing the hot air blast on the dish inside the special furnace. However, there is one problem with the process. It is destructive in nature, as you have to melt the piece for the determination of the gold concentration.
Ultrasound Assay
Most people know what an ultrasound is, but they know its use in the medical field. But a few of you know that the same technique can help in assaying. This technique defines a different assay meaning where the aim is to measure the alterations in the consistency level of the precious metal.
This is different from the other method of assaying. The process is non-destructive and does not call for any melting of metals. Thus, it is ideal for determining whether a certain product has metal plating without causing any damage to the product.
Electronic Tester
The electronic testers measure the electrical resistance of the sample to test. The resistivity will quantify the strength with which the test sample will oppose the flow of electrical current. The unit of expression is Ohms.
- The tester will use specific signals to measure the sample’s surface resistivity.
- Then the tester will transmit another signal entirely via the sample for measuring the through-resistivity as well as the thickness of the sample to test.
Such testing of through-resistivity against the surface resistivity will help to detect whether there is a plating or filling in the sample.
The process is different from the fire assayer and it is a complete algorithmic technique. The aim is to correlate the resistance level of the unknown sample to that of the known metals and determine the metal type subsequently.
Certificates of Authenticity
The real purpose of applying the assays is to create a certificate of authenticity. Such documents guarantee the authenticity of the artwork and the purity of the metal.
Assay Test Meaning
Certificates of Authenticity information
The certificates aid in ensuring that the coins and bars of gold or silver that the mints are making meet the accurate purity standards of the centralized guidelines.
For instance, if the mint claims to provide gold bars with 99.9% purity, the assay will prove that the minted gold in the lot is meeting the necessary requirements.
Precious Metal Products that Come with COA
Most people to prefer metal products with COA to ensure that they are getting the purest form of metal.
Precious Metal Products that Come with Assay
Bullion bars usually come with an assay. The assay meaning is clear to the investors and collectors.
The reason for an assay is simple: The bars are valuable, and large, and should promise and have a maximum level of purity.
FAQ
What is a gold certificate of authenticity?
The Government of India declared the BIS Hallmark to be the official gold Certificate of Authenticity. It protects and certifies the purity of the gold metal, according to the Bureau of Indian Standards.
Do certificates of authenticity have value?
Yes. The COA can work as a sales receipt too, ensuring smooth sales and a relation of trust between the manufacturers and customers.
Can you trust a certificate of authenticity?
Yes, you can trust the certificate of authenticity from reputable mints around the world. Buying from an unknown or unproven mint/dealer may give an inauthentic certificate of authority.
We hope this answers most of your questions. Still, have questions? Email us at [email protected], or call us at 1-866-454-BOLD (2653).
