- Industries
- What We Buy
- Refining Process
- Testing Methods
- Precious Metal Recycling
- Shop
- Wholesale Bullion Products
- Jewelry Manufacturing Products
- Sell Your Lot
- About
- Resources
- Login
- Create an Account
Our Precious Metal Refining Process
Our gold refining process begins when we receive your scrap gold (or other precious metals) to be recycled. To determine the metal’s purity, we perform an assay. Once we have assayed the weight and purity of the gold, we have all the information we need to quote you a payout price. From there, your gold is melted down in our refinery. You can even watch this entire process in person.
Testing Methods for Precious Metals
Depending on the amount of precious metals and the form they’re in, some assays can be more efficient than others. We specialize in several types of assays, or testing methods. This chart shows the key differences between the assays we offer and their costs:
| Acid Testing | XRF-Analysis | Fire Assay | Ultrasonic Testing | |
|---|---|---|---|---|
| Accuracy | 10-20 parts per thousand | 2-5 parts per thousand | 1-5 parts per ten-thousand | 100% |
| Destructive? | No | Yes | Yes | No |
| Time for Results | Instant | two minutes | 1-2 days | Instant |
| Cost | Free | $5 | $25 | Free |
| Useful for testing… | most small lots | filing dust, polishing material and non-plated metals | very large lots of mixed materials | bullion authenticity |
Our Assays
Depending on the size of the lot, the type of scrap it contains, and your personal preference, we may do one of these assays:
- Acid Test (Hand Test)
- X-RF Assay
- Fire Assay
- Ultrasound Assay
While gold, silver, platinum and palladium metals come from different industries and may be used for different applications, we have expertise with them all.
Acid Testing
The acid test for gold has been used by jewelers, refiners, and other precious metal professionals for centuries. We use this acid testing method for small pieces or lots of precious metal.
About Acid Testing
XRF Assay
For our customers with a sizable enough lot who want a highly accurate precious metal analysis, we use XRF gold testing (X-ray fluorescence) as our onsite assaying method.
About X-RF Assays
Fire Assay
A fire assay–or melt test–is the most complex and accurate assay method. Commonly used at mining companies and refineries, we recommend this testing method when acid or X-RF tests aren’t the best assay option.
About Fire Assays
Ultrasound Assay
The ultrasound test is perfect for determining whether an item is precious metal-plated without damaging it. That’s because unlike other assay methods, melting is not required.
About Ultrasound Assays
Questions About Our Refining Process? We’re Happy To Help!
Contact Us
Newsletter
Subscribe to our newsletter to get updates regarding our business and precious metal refining.
Copyright © 2023 Manhattan Gold & Silver. All rights reserved.