Xiamen Tungsten's (SHA:600549) processing subsidiary, Luoyang Yulu Mining, has suspended operations following the cutoff of its essential raw material supply, according to a Shanghai bourse filing on Thursday.

Joint venture partner and primary supplier CMOC Group (SHA:603993, HKG:3993) stopped delivering scheelite tailings to Yulu Mining's facility.

The raw materials are sourced from CMOC's Sandaozhuang molybdenum-tungsten mine in Luanchuan County, China.

Xiamen Tungsten said the duration of the work stoppage is currently uncertain, and the impact on the company's performance cannot be predicted at this time.

In 2025, Yulu Mining achieved operating revenue of 362.7 million yuan, accounting for 0.78% of the company's consolidated operating revenue for that year.

Shares of Xiamen Tungsten rose nearly 3% in recent trade, while CMOC's shares jumped 5% in Shanghai and 1% in Hong Kong.