Refining

The separating and purifying of precious metals from other metals is called refining.

Crown and bridge scrap, dental alloy or any other precious metal scrap are mixed with a flux (Borax & Soda Ash) to help separate the metal from all the non-metal in the scrap before being poured into a separate mould. When the metal cools, we break it out of the mould and evenly pierce it all over to collect homogenous “samples”.
Once we have an accurate after melt weight and a good sample, we can proceed with the assaying step which is the final step in the process.

Assay

Our mission is to determine the four major precious metals used in the jewellery and dental industry which are Gold, Silver, Platinum and Palladium contained in your materials.

The NOR METALS assay laboratory fully serves its clientele with Fire Assay and X-ray Fluorescence Assay following the needs and requests of our clients.
Not everyone has the time that fire assay requires, so the XRF is sometimes a great alternative.

In both cases the results of these tests are usually reported in the form of parts per million or also as ounces per ton.

X-ray Fluorescence Assay

The X-ray fluorescence is a non-destructive process and hence, it is used for applications where there is a need to maintain the integrity of the sample. Assay by this method is very efficient, allowing us detect the exact percentage of gold, silver, platinum or palladium in your sample very quickly (a few minutes). When testing is complete, a full report indicates the percentages of gold content as well as other alloying metals such as copper, silver, zinc, etc. This method is remarkably accurate.

Fire Assay Analysis

Fire assaying is the classic method of measuring purity and is the industry standard process for obtaining analytical gold and platinum group element data from high grade ores. It is a modernized process but in its simplest form, has been in use for centuries. Although it is the most accurate method of analysis, it is totally destructive and take approximately 24-48 hours

All our gold and silver bearing alloys, grains, solders, wire and sheet are fire assayed to assure their precious metal content. A certificate of analysis is also provided for each assay

Troy System Metric conversions to Troy
1 gram .03215 troy ounce
1 gram .642 penny weights
1.5517 grams 1 pennyweight (dwt)
31.10135 grams 1 troy ounce
1000 grams 1 kilogram
1 kilogram 32.15076 troy ounces
1 pennyweight .05 troy ounces
20 pennyweight 1 troy ounce
14.5833 troy ounces 1 lb. avoir/American wt
12 troy ounces 1 troy pound