126 COOOEN BROWN : MINES & MINERAL RESOURCES OF YUNNAN. 



rebellion. Other deposits, some of wjieh WQC6 exploited by the 

 hill tribes, were located west of the same town. 



According to Joubert, numerous argentiferous lead mines existed 

 near Sin-kai-tse, six leagues from Co-kouy, on the banks of a river 

 bearing the same name. The quantity of silver produced seemed 

 large enough to cover the costs of exploitation and transport of 

 the lead to the markets of Chung-king, 100 leagues away, on \hv 

 Yangtze. Very rich and easily worked argentiferous lead mines 

 were situated near Tung-ch'uan, and at Meng-tzu, five stages to 

 the west of Lin-an Fu. The extensive deposits found around the 

 town of lyoui Fu, on the banks of the Yangtze, were considered 

 as the most likely to be worked. (G., II, p. 161). 



Leclere recalls that the metallurgy of lead, silver and zinc forms 

 part of the Imperial Monopoly. He regarded the importance of 

 the deposits as not great enough to justify expenditure on communi- 

 cations to them. The development of the lead, silver and zinc 

 mines was subordinated to the production of copper. Lodes con- 

 taining lead ores are not as numerous as copper lodes and they 

 are only well developed in certain localities, notably around Ko- 

 chiu and Wei-ning Chou. In the former locality, the vein at 

 Long-teou-tchai was certainly extensive and very regular, though 

 when Deprat wrote in 1911, the workings had been abandoned. 

 The silver was extracted from the lead by cupellation, and the 

 slags were often rejected. It was clear that many of the residues 

 accumulated under such a system would be amenable to European 

 methods. Leclere estimated the annual production of metallic 

 lead in Yunnan as approximately 3,000 metric tons. 



Lantenois received information regarding an argentiferous lead 

 mine at Pan-san, one stage to the south of the Ouai-teou-chai mines 

 where there were estimated to be 10,000 metric tons of lead slags 

 probably worth re- treating. Lead is also said to occur in the 

 Kai-hua Fu and Meng-tzu Hsien regions. At the latter place, 

 Lantenois examined specimens of antimonial galena and of quartz 

 with mispickel which came from these mines. The veins appear 

 to be related to the granites of the district. (La., pp. 421-422.) 



Duclos calculated the annual production of lead at 2,598 metric 

 tons in 1897. (Du.. p. 285). He remarks on the difficulty of 

 separating lead and zinc mine 5 owing to the constant association of 



