The Erdaogou gold deposit is located in the conjuncture of North China Carton and Xingmeng orogenic belt. The ore-forming process of Erdaogou gold deposit is divided into three stages (I to III), which are quartz-pyrite stage (stage I), quartz-polymetallic sulfide stage (stage II) and quartz-calcite stage (stage III). Two types of fluid inclusions is distinguished in the ore-forming stage, i.e., aqueous type (W-type) and aqueous-carbonic type (C-type) inclusions. From the stage I to III, the homogenization temperature of fluid inclusions are respectively 334–395, 214–364 and 172–272 °C, with salinities of 7.72 wt.%–11.23 wt.% NaCl equiv., 0.20 wt.%–23.18 wt.% NaCl equiv., and 0.35 wt.% to 5.25 wt.% NaCl equiv. The ore-forming fluids of the Erdaogou deposit have the characteristics of medium-low temperatures, moderate salinities and low densities. And the fluids belong to the CO₂-H₂O-NaCl system. The values of δ³⁴S_V-CDT in sulphide samples at different stages (stages I to III) are between −2.2‰ to 2.3‰, indicating sulfur source from magma volatiles or subvolcanic rock leaching. The lead isotopes suggest that ore-forming metals may be derived from a mixture of lower crust and mantle materials. Oxygen and hydrogen isotope data at Erdaogou indicate that magmatic fluid and meteoric water may both be involved in the hydrothermal system. Based on the geological characteristics, fluid inclusion results, stable and radiogenic isotope results of Erdaogou gold deposit, we believe that the temperature decrease, fluid boiling are the key factors leading to the ore precipitation and the genetic type of Erdaogou gold deposit is low-sulfidation epithermal deposit.

二道沟金矿床位于华北纸盒与兴蒙造山带交界处。二道沟金矿床的成矿过程分为三个阶段（一至三），分别为石英黄铁矿阶段（第一阶段），石英多金属硫化物阶段（第二阶段）和石英方解石阶段（第三阶段）。在成矿阶段有两种类型的流体包裹体，即含水型（W型）和含水碳型（C型）包裹体。从第一阶段到第三阶段，流体包裹体的均质温度分别为334–395、214–364和172–272°C，盐度分别为7.72 wt。％– 11.23 wt。％NaCl，0.20 wt。％–当量的NaCl当量为23.18 wt。％，NaCl的当量为0.35 wt。％至5.25 wt。％。二道沟矿床成矿流体具有中低温，盐度适中，密度低的特点。₂ -H ₂ O-NaCl系统。δ的值³⁴小号_V-CDT不同阶段（阶段I至阶段III）的硫化物样品中的硫含量在-2.2‰至2.3‰之间，表明硫源来自岩浆挥发物或火山岩下浸出。铅同位素表明，成矿金属可能来自下地壳和地幔物质的混合物。二道沟的氧气和氢气同位素数据表明，岩浆流体和陨石水可能都与热液系统有关。根据二道沟金矿床的地质特征，流体包裹体结果，稳定和放射性同位素结果，我们认为温度下降，流体沸腾是导致矿石沉淀的关键因素，二道沟金矿床的成因类型为低硫化作用。超热沉积。