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内华达州Humboldt县Sleeper矿床的带状金-银富矿脉具有类似于National地区和日本Hishikari矿床这类浅成低温矿脉系的结构和矿物学特征。这些矿脉所有富矿的形成深度约小于500m。其特征是:(1)Au/Ag比相对高(典型地>1);(2)银金矿是金矿化阶段中的主要矿石矿物,其含量要比共生的硫化物和硫盐矿物多得多;(3)作为主要脉石矿物的细粒二氧化硅普遍存在。早期的研究认为,胶体二氧化硅和金粒对Sleeper矿床富矿石中产生富金条带是很重要的。原生二氧化硅性质和银金矿沉淀物的识别及其沉淀期后结晶史对于了解Sleeper矿床富矿脉内金的沉淀过程尤为重要。
The gold-silver vein of the Sleeper deposit in Humboldt County, Nevada, has structural and mineralogical characteristics similar to the epithermal mineralization series such as the National and Hishikari deposits in Japan. The depth of formation of all the orebodies in these veins is about less than 500 m. (1) the Au / Ag ratio is relatively high (typically> 1); (2) the silver-gold ore is the major ore mineral in the gold mineralization stage and its content is higher than that of the symbiotic sulfide and sulfur salt minerals Much more; and (3) finely divided silica, the main gangue mineral, is ubiquitous. Earlier studies suggested that colloidal silica and gold grains are important for producing rich bands in the ore rich in the Sleeper deposit. The nature of the primary silica and the identification of silver-gold deposits and their post-depositional crystallization history are of particular importance in understanding the precipitation of gold within the deep vein of the Sleeper deposit.