A Backup Mineral Supplier Has to Pass the Factory Test

A manufacturer can find another mineral supplier and still be unable to use its material when the next shipment fails to arrive.

That is the practical problem behind China’s widening export controls.

The IEA’s Global Critical Minerals Outlook 2026 reports that the number of mineral tariff codes subject to Chinese export controls has tripled since 2023. These are customs product classifications: several codes can cover different forms of the same mineral.

The exposure extends beyond rare earths to materials such as gallium, germanium, graphite and tungsten, while controls have also targeted processing equipment and technologies. Some expanded measures remain temporarily suspended, so their implementation status needs to be checked individually.

For manufacturers, the response requires more preparation than collecting alternative quotations.

The IEA explicitly identifies supplier qualification, product testing and certification as additional costs of diversification. A source may have material available without that material already being approved for a customer’s production process.

An assay can establish metal content and purity. Industrial approval may require further testing to demonstrate that the supplied material performs consistently in the intended application.

Consider a factory that has identified a second supplier but has not completed those tests. If its usual deliveries stop, purchasing from the backup could still leave a gap between receiving material and putting it into production. This is a possible operational constraint, rather than a claim about a particular company.

Qualification work is therefore part of supply security.

Our reading is that manufacturers should assess how much approved, usable supply they could obtain within their actual production timetable. A supplier’s location and quoted price provide only part of that answer; specifications, repeatability, processing dependencies and delivery capacity complete it.

Starting this work while normal shipments continue gives companies room to test and resolve problems.

Waiting until a disruption begins means trying to qualify replacement material while the factory is already running down its remaining stock.