Burundi's mining sector was thrust into prominence last month when the US said it was one of those it was considering to diversify its sources of rare earths.
Trump invoked the 69-year-old Defense Production Act -- once used to preserve American steelmaking capacity -- to remedy what he called “a shortfall” in production of the super-strong magnets made with neodymium and samarium.
The Pentagon wants miners to describe plans to develop U.S. rare earths mines and processing facilities, and asked manufacturers to detail their needs for the minerals.
Exports of the group of 17 chemical elements used in everything from high-tech consumer electronics to military equipment came in at 3,966 tonnes last month.