U.S. shale drilling companies are paying higher prices for tungsten. This rare metal is used in industrial tools such as drill bits.

U.S. shale drillers are facing higher prices for tungsten, a rare, ultra-hard metal used for industrial tools like drillbits, ...

U.S. shale drillers are facing higher prices for tungsten, a rare, ultra-hard metal used for industrial tools like drillbits, as Chinese export controls have squeezed supply, threatening U.S.