ベトナム北部の鉛亜鉛鉱床のインジウム含有量—予察調査

抄録

Reconnaissance chemical study was made on the lead-zinc ores from Paleozoic sedimentary units of the northern Vietnam, which belongs to the South China block. Special attention was paid to the In-content, because of large producers of Dulong and Dachang mines located in the Chinese side. The lead-zinc ores have sporadic high In-contents, being the highest in the Nabod ores (In_sp=10 - 2603 ppm, average=688 ppm In, n=7). Zn concentrates of the Dien mine are 67 ppm In, which could be recoverable with the recent prices. From the ore textures and ore setting in the sedimentary host rocks, and Cd_sp contents, no typical Mississippi Valley-type deposits are observed in these lead-zinc ore deposits in the northern Vietnam.