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Truck manufacturers and component suppliers said they are continuing to experience challenges as they search for “conflict minerals” in their supply chains.

The federal agency charged with compiling a list of African smelters and refiners that produce “conflict minerals” is nearly 18 months behind schedule in providing information that could help publicly traded companies guard against using the tainted minerals.

Publicly traded truck makers and industry suppliers told federal regulators they have not determined whether their suppliers use African “conflict minerals” in the manufacture of products.