What Is Doré Bullion?

If you’ve come across the term “doré bullion” in a mining report, an assay certificate, or a geological consulting job, it’s not the same thing as the gold or silver bars sold at a coin shop. Doré is unrefined metal, and understanding what’s actually in it matters before it goes anywhere near a scale or a payout quote.

What Doré Bullion Is

Doré bullion is a semi-pure bar of gold and silver poured directly at a mine site, before any refining takes place. The term comes from the French word for “gilded,” and it reflects what the bar actually is: a mixed alloy, not a finished product.

Doré bars typically combine gold, silver, and leftover base metals from the ore they were extracted from. The ratio of gold to silver varies significantly by mine and by ore body, and the exact composition of any given bar can’t be assumed. That’s the core difference between doré and the bullion most people picture.

For terminology on other precious metal industry terms, see our Gold Bullion Glossary.

How Doré Differs from Refined Bullion

Standard bullion bars, the kind traded on global markets, meet Good Delivery specifications set by organizations like the London Bullion Market Association. That means a purity standard of at least 99.5%, consistent weight, and a known, single-metal composition.

Doré meets none of those standards. It’s a mixed bar of gold and silver, often with trace base metals still present, and its exact value can’t be determined by weight alone. A doré bar sitting at the same weight as a Good Delivery bar could be worth significantly less, depending on what percentage is actually precious metal.

This is also why doré isn’t priced or traded the same way spot gold or silver is. Pricing benchmarks like The London Fixing apply to refined metal. Doré has to be assayed first to know what it’s actually worth against those benchmarks.

Where Doré Bullion Comes From

Doré bars are produced at the mine site, typically by small-scale and mid-size mining operations that don’t have full refining capability on location. Instead of shipping raw ore, mines pour the recovered gold and silver into doré bars, which are easier and safer to transport than crushed or leached ore.

Geological consulting firms and assay labs also encounter doré in the course of testing mineral samples and confirming ore grades for mining clients. In both cases, the material needs a facility equipped to determine and separate its actual precious metal content, which is a different job than typical scrap refining.

How Doré Is Valued and Tested

Because doré is a mixed, unrefined alloy, its value can’t be estimated from weight or appearance. Determining the actual gold and silver content requires assay-grade testing.

Fire assay is the standard method for this kind of material. It’s the most accurate way to separate and measure precious metal content in a mixed sample, which matters when the bar could be a wide range of purities. Larger or higher-value lots may also go through XRF testing to confirm composition before any further processing.

• Fire Assay
• XRF Testing

Skipping this step and estimating value based on weight alone is how mining operations and consultants end up underpaid or overpaid relative to what the bar actually contains.

What Happens After Testing: Refining Doré into Usable Metal

Once a doré bar has been assayed, the next step is refining. This is where the mixed alloy is broken down: gold is separated from silver, remaining base metals are stripped out, and the result is standard bullion, casting grain, or another usable form of refined precious metal.

This is the same process that turns any mixed or unrefined precious metal material into a form that can be priced, sold, or reused, whether the source is doré, industrial scrap, or jewelry byproducts. You can see the full breakdown of how this works on our Refining Process page.

Why This Matters for Domestic Mining and Geological Consulting

If your work involves domestic mining or geological consulting, doré is a material you may deal with directly, whether that’s a bar poured at a mine site or a sample sent for assay confirmation. The number that matters isn’t the bar’s weight. It’s the assayed gold and silver content underneath the alloy.

When you’re evaluating where to send doré for testing or processing, look for a facility with in-house fire assay and XRF capability and experience separating mixed precious metal alloys, not just standard scrap. Estimating value off face weight, or working with a facility that can’t test mixed alloys accurately, is where mining operations lose money on this kind of material.

Frequently Asked Questions About Dore Bullion

Is doré bullion the same as a standard bullion bar?

No. Standard bullion bars meet strict purity standards (99.5% or higher) and contain a single precious metal. Doré bars are a mixed, unrefined alloy of gold and silver, often with base metals present, and their purity varies by source.

Can doré bullion be sold or traded like regular bullion?

Not directly. Because its composition varies, doré has to be assayed first to determine actual precious metal content. It doesn’t trade at spot price the way refined bullion does until that content is known.

What percentage of a doré bar is actually gold or silver?

It varies widely depending on the mine and ore body it came from. There’s no standard ratio, which is why assay testing is necessary before determining value.

What’s the difference between doré and scrap precious metal?

Doré originates from a mining operation and is a mixed gold/silver alloy poured at the mine site. Scrap typically refers to precious metal byproducts from jewelry, dental, or industrial work. Both are unrefined and require assay and refining, but they come from different sources and often have different compositions.

Why can’t doré be valued just by weighing it?

Because doré is a mixed alloy with variable gold and silver content, weight alone doesn’t indicate value. Two doré bars of identical weight can have very different amounts of actual precious metal, which is why assay testing comes first.

Have questions about assay testing or the refining process for mixed precious metal materials? Create a free Business Portal account to learn more about how our assay-based process works.

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