A court in central China's Hunan Province has handed down the death penalty for two drug dealers, one from Hong Kong and the other from Mexico, for producing and selling drugs in China.

Two other principal culprits of the transnational drug gang were sentenced to suspended death with two years' reprieve, according to Friday's ruling by the Intermediate People's Court in Chenzhou City.

Five members of the gang received jail terms from 15 years to life, according to the court ruling.

Court investigation found the gang produced more than 400 kilograms of methamphetamine and 254 kilograms of caffeine at their underground drug factory in a mountainous village in Guiyang County of Hunan Province.

About 100 kg of the meth had been sold to drug dealers and addicts before the gang was busted in 2013.