RE:RE:Concentrate to “Asia”. Chinese Cu smelters largest. I think this article has been debunked
To summarize
Moly / Rhenium concentrate can be processed in USA. There are at least 2 facilities - Pennsylvania and FCX in Colorado, could be others
https://www.centerragold.com/operations/thompson-creek-metals/langeloth/history
Copper concentrate - Cu, Au and Ag can go whereever in Asia. Current US Cu smelter capacity may not be able to handle Pebble. US smelters in Utah, Arizona, Texas
A Look at the Largest Copper Smelters (thoughtco.com) US exports and imports Cu from many ports - It is the net US production versus consumption that matters