Abstract:Silver occurs as an associated element in the Wubu Pb-Zn deposit. In spite of its poor and extremely variable grade (ranging from 2 g/t to 231 g/t with a few even reaching 800 g/t), this element is widely distributed and is fairly large in amount, being characterized by relative concentration of high content at shallow depths. From about 400 m level upward its grade rapidly increase, varying in considerably wide limits; below this level the grade decreases and tend to be comparatively stable. Thus, stable on the whole while intensely variable in certain parts seem to be the character of distribution of silver in this deposit. Silver is present in two forms: 1) individual silver minerals, such as electrum, argentite, arsenopoly basite and native silver, either scattered in crystals of metallic sulfides or, more dominantly, infilling the cracks and cleavages of the sulfide minerals; 2) isomorphous mixtures existing chiefly in galena and to a less amount, in sphalerite, pyrite, etc. The latter claim has been substantiated by electron probe-scanning and X-ray diffiaction studies. Individual silver minerals seem to concentrate in the upper part of the deposit, thus resulting in the gradual increase in total assigning ratio of silver in sulfides with the depth. An investigation of the regularity governing the variation of silver content would undoubtedly furnish information on the extent of erosion of the deposit.
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郑人来，谢从智.1984.浙江五部铅锌矿床中银分布规律的初步探讨[J].矿床地质,3(1):19~26.1984.A preliminary study of the distribution of silver in the Wubu Pb-Zn deposit, Zhejiang Province[J].Mineral Deposits3(1):19~26
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