Crushed Ore vs Flotation Concentrate: What the Difference Means for Your Smelter Contract

Crushed ore and flotation concentrate are two different products, and the difference changes almost every line of your smelter or trading contract. Crushed ore is run of mine rock that's been reduced to a size range by crushing. Concentrate is that same ore after beneficiation (usually flotation), where most of the waste minerals have been floated off and the metal content is packed into a much smaller mass.

If you're buying, you need to know which one you're getting before you talk price, freight or assay. Because they don't behave the same way.

GBX Resources sells crushed ore. Not flotation concentrate. So this post is written straight — here's what each product is, and what it does to your contract.

What's the actual difference between crushed ore and concentrate?

Start with the processing step.

Crushed ore is mined rock, broken down to a buyer's size range. That's it. The metal grade is whatever the deposit gives you, minus nothing. It's sometimes called DSO (direct shipping ore) when the grade is high enough to ship without upgrading, and "run of mine" refers to material straight from the pit before any processing beyond crushing.

Flotation concentrate is a manufactured product. The ore gets ground fine, mixed with water and reagents, and the valuable mineral is separated from the gangue in flotation cells. What comes out is a powder with a much higher metal percentage.

So the headline contrast:

Both are legitimate feed. Smelters buy both. The choice depends on what your plant is set up to handle and how the freight math works out.

How crushed ore changes your smelter contract

Here's the thing most first-time buyers miss. The contract structure is similar for both, but the numbers in it move.

Payable metal. With concentrate, you're paying for a high percentage of a small tonnage. With crushed ore, you're paying for a lower percentage spread across more tonnage. Your treatment charges, deductions and payable formula all need to reflect that you're moving more rock per unit of contained metal.

Freight per unit of metal. This is the big one. You pay freight on weight. Crushed ore carries more waste mineral, so you ship more tonnes to get the same contained metal. On a long sea route that cost adds up. On a short route, or when the ore grade is high, it can still pencil out fine — and you skip the cost and losses of a flotation plant entirely. Run the landed cost per unit of metal, not the price per tonne of material. Always.

Penalty elements. Arsenic, bismuth, lead, mercury, antimony (depending on what you're smelting) — these get penalised either way. But in crushed ore they haven't been concentrated by flotation, so the deleterious-element picture can look different. Read the assay, not the assumption.

Moisture and handling. Fine concentrate can be a Group A cargo under the IMSBC Code with a transportable moisture limit that has to be tested and certified. Crushed sized ore behaves more like a bulk rock cargo. Still confirm the classification and moisture with your inspector — don't guess at the shipping rules.

For the specifics on each product we offer, the antimony ore, lead ore with silver and copper ore pages set out how they're sold.

What to check in the assay before you sign

The certificate of analysis is the contract's backbone. Whether it's ore or concentrate, check these:

• Who analysed it. GBX lots are sampled and analysed by SGS Pakistan, and each lot is sold against that SGS certificate of analysis.
• The main payable element and its grade basis (dry basis is standard — confirm it).
• Moisture content, reported separately.
• Penalty elements, each one listed with its figure, not lumped together.
• The size range the ore was crushed to.
• Your right to test. You can test a sample in your own lab, and you can appoint SGS or your own inspector at loading. Use that right.

Honestly, the single biggest mistake I see is a buyer pricing off material tonnage and forgetting the grade. A cheaper price per tonne of ore is not a cheaper price per tonne of metal. Do that calculation first, every time.

Crushed ore vs concentrate: which should you actually buy?

Depends on your plant and your route.

Buy concentrate if your smelter wants high-grade, low-volume feed and the long freight leg would punish you for shipping waste. Buy crushed ore if you can handle the volume, you'd rather not pay for someone else's flotation step, or your process takes ore feed directly. Some buyers blend crushed ore into their own circuit and upgrade it themselves — that way they control the beneficiation and the reagent choice.

Look, there's no universally "better" product. There's the one that fits your furnace, your logistics and your assay tolerances. A good supplier will give you the SGS numbers and let you run your own math instead of telling you what to think.

For jade it's a different story entirely — nephrite is sold as rough blocks by weight, each block weighed, photographed and filmed. No assay, no flotation, just inspection of the stone itself.

Documents and terms to expect

GBX offers are FOB Karachi, with CFR on request. Minerals are supplied to order, so availability and the shipment window get confirmed when you enquire. Expect the SGS certificate of analysis, standard commercial and shipping documents, and the inspection arrangement you choose at loading.

HS codes vary by mineral and by your destination's tariff schedule — classify against your own country's customs rules and confirm with your broker before you book. Don't rely on a code someone quoted for a different border.

To get specs, availability and a quote for crushed antimony, lead-silver or copper ore — or rough nephrite blocks — request a quote on the relevant minerals page or message WhatsApp +92 300 3644444 with the mineral, size range and destination port.