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共同—疙瘩沟地区金－多金属矿床（点）多产于燕山早期花岗岩中，矿体石英中流体包裹体较发育，以气液包裹体为主。通过流体包裹体的研究认为：成矿流体属于Ｎａ＋－Ｃａ２＋－Ｃｌ－［ＳＯ４］２－型，中—低盐度（５．７％～８．５％），成矿温度为中（偏低）温（２２５～２７５℃），压力为７５．１～１１５．８ＭＰａ，ｐＨ为５．２３～６．０５，Ｅｈ为－０．５７～－０．６２Ｖ，推断Ａｕ最可能的搬运形式为［ＡｕＣｌ２］－。可见该地区金－多金属矿床（点）为中（偏低）温岩浆期后热液矿床。
The common-Piqigou gold-polymetallic deposits (spots) are prolific in the Yanshanian early granites. The fluid inclusions in the quartz bodies of the ore bodies are well developed and mainly consist of gas-liquid inclusions. According to the research of fluid inclusions, the ore-forming fluid belongs to Na + -Ca2 + -Cl- [SO4] 2- type and medium- low salinity (5.7% -8.5%), the ore-forming temperature is moderate ) Temperature (225-275 ℃), pressure of 75.1 ~ 115.8MPa, pH of 5.23 ~ 6.05 and Eh of -0.57 ~ -0.62V. It is concluded that the most possible transport form of Au is [ AuCl2] -. It can be seen that the gold-polymetallic deposit (point) in this area is moderate (low) warm magmatic post-hydrothermal deposit.