广东长坑—富湾银金矿床金银矿化规律统计研究

STATISTICAL STUDY OF GOLD SILVER MINERALIZATION REGULARITY OF THE CHANGKENG FUWAN GOLD SIL VER DEPOSIT, GUANGDONG PROVINCE

对矿区７０个见矿钻孔的金银矿化进行了统计研究，包括矿化的厚度分布，见矿次数，合计见矿厚度和平均矿化厚度。矿化主要出现于硅质岩类中，但非硅质岩类的矿化也不可忽视。各种岩性有其自己的成矿趋势和特点。金矿化较厚，高品级矿石比例大，矿化品级与厚度基本上呈正向消长，成矿与厚层角砾状硅质岩的专属性关系密切。金矿化的规律呈现得较清晰。银矿化在这些方面不如金矿化，缺乏清晰的规律。出现上述情况的原因与矿床发育两种矿化（早期热水沉积层状矿化和后期热液叠加脉状矿化）有关。

Statistical study of gold silver mineralization was made for 70 ore intersecting drill holes in the ore district,which includes thickness distribution of mineralization,ore intersecting times,total ore intersecting thickness and average mineralization thickness.Mineralization mainly occurs in silicolites;nevertheless,mineralization in nonsilicolites also deserves much attention.Each kind of rock has its own metallogenic tendency and characteristics.Gold mineralization is thicker and has larger proportion of high grade ore than silver mineralization.The mineralization grade of gold generally shows direct growth and decline relationship with the thickness,and the gold metallogenesis is closely related to the specialization of the thick bedded brecciated silicalite.Gold mineralization exhibits fairly distinct regularity,while silver mineralization does not show such clear relationship with a certain kind of rock.All this is attributed to the development of two sorts of mineralization in the ore deposit,namely the early hydrothermal stratiform mineralization and the late hydrothermal superimposed stratiform minerlization and the late hydrothermal superimposed veinlike mineralization.