China's overseas mining investment projects are facing obstacles, while domestic output is steadily increasing to meet the country's demand, experts said on Wednesday.

"To further secure mineral resources, China has accelerated overseas mining investments in past years, but many operations face a gloomy future," said Liu Xiaoliang, secretary-general of China's Metallurgical Mines' Association, during the 13th China International Steel and Raw Materials Conference held in Qingdao, Shandong province.

China has 13 overseas mines in operation with a total annual output of 62 million metric tons, which accounted for 8.3 percent of China's annual imports last year, Liu said.