Data shows that two years after the worst of the raw materials slump is over, investors are still not ready to pour in fresh funds despite a price rally.
On Thursday, Newcrest reported a 58% fall in half-year underlying profit, due to disruptions such as an earthquake hitting one of its key sites in 2017.
Freeport's export permit for Grasberg, the world's second-biggest copper mine, is due to expire on Friday, as is Amman's permit to ship ore concentrate from its Batu Hijau mine on the island of Sumbawa.
Platinum demand fell nearly 7 percent last year, with sharp falls seen in Japanese investment and Chinese jewellery buying as well as a slowdown in consumption by carmakers, who use the metal in catalytic converters.
Some lawmakers urged him to save steel and aluminum producers in their states, but others urged caution because higher prices would hurt manufacturers.
Some members of Mongolia's parliament sought to limit the number of new resident permits granted to foreigners to 100 per year to protect domestic jobs.