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冀西北的东坪、中山沟、后沟等金矿床产于碱性正长岩杂岩体的内外接触带，与岩体有成因联系。矿石为少硫化物型。矿体有三种类型：石英脉型；石英脉＋脉旁蚀变岩型；钾、硅化蚀变岩型。对微量元素、稀土元素及S、Pb、C、O和Si的同位素的研究结果表明，成矿物质主要来源于碱性杂岩体，成矿流体混合热液，成矿时代为燕山期（钾长石Ar－Ar年龄为156～177Ma）。矿床为燕山期强烈岩浆活动产生的岩浆水与大气降水作用形成的混合热液对海西期碱性杂岩体（327．4Ma）交代改造而形成的一种新的改造型热液金矿床。
The gold deposits of Dongping, Zhongshaigou and Hougou in the northwest of Hebei Province are produced in the inner and outer contact zones of alkaline syenite complex and have a genetic relationship with the rock mass. Ore is less sulfide type. There are three types of ore body: quartz vein type; quartz vein + pulse alteration rock type; potassium, silicified alteration rock type. The results of isotope studies of trace elements, rare earth elements and S, Pb, C, O and Si indicate that the metallogenic materials are mainly derived from alkaline complex bodies and the hydrothermal fluid is mixed with hydrothermal fluids. The mineralization age is Yanshanian (potassium Feldspar Ar-Ar age of 156 ~ 177Ma). The deposit is a new type of remodeled hydrothermal gold deposit formed by the replacement of the Hercynian alkaline complex (327.4Ma) by the hydrothermal fluid from magmatic water and atmospheric precipitation produced by intense magmatism during the Yanshanian period.