"The bustling child labor market (in Sichuan province) was set up by the local chief foreman and his gang of 18 minor foremen, who each manage 50 to 100 child labourers," the Southern Metropolis Newspaper said.
"The children generally fall between the ages of 13 and 15, but many look under 10," it added.
The newspaper said 76 children from the same county, Liangshan, had been missing since the Chinese Lunar Year festival in February, 42 of whom had already left the region to work.
Xinhua news agency said the county government had sent officials to rescue the children, but some were unwilling to leave, having been sold into slavery by their parents or volunteering to work themselves. Continued...
According to a contract exposed by an undercover reporter, a child laborer is paid 3.5 yuan ($0.50) an hour and must work at least 300 hours a month.
"The youngest kids found in the child labor market were only seven and nine years old," it said.