## 4 Results and Discussion
### Geochemical Lithogene (LG03)
(2018) determined that the gene of acidic rock in China is 11012020211, the gene of neutral rock in China is 11210002110, and the gene of basic rock in China is 10210102200. According to the above gene similarity calculation method, the similarity to the other two rocks of a rock is calculated, respectively. Compared with acidic rock, the genetic similarity of neutral rock is 50%, and the genetic similarity of basic rock is 40%. Compared with intermediate rocks, the genetic similarity of basic rocks is 80% [25]. This indicates that the lithologic gene LG02 can significantly distinguish acidic rocks from the other two rocks. However, for the two kinds of rocks, neutral rock and basic rock, their differentiation is relatively low. In order to make up for the deficiency that the lithologic gene LG02 cannot effectively distinguish basic rock from neutral rock, [PERSON] et al. [26] proposed that the ideal acidic rock in China (a virtual rock sample represented by the elemental abundance of acidic rock in China compositionally) has the same gene code of 10202020202 on LG01 and LG03, and the ideal basic rock in China also has the same gene code of 12020202020 on these two lithogenes. The gene similarity of a sample relative to the ideal acidic rock is called the sample's acidic similarity and can be labeled as \(R_{\text{Acidic}}\). This also makes up for the fact that the genetic code of the lithogene LG02 is not easy to remember when expressing lithology. According to this definition, the \(R_{\text{Acidic}}\) of the ideal acidic rock in China is 100%, while the \(R_{\text{Acidic}}\) of the ideal basic rock in China is 0%. Geological materials can be classified into three groups: acidic-like composition with \(R_{\text{Acidic}}\geq 80\%\) labeled 1, intermediate-like composition with RAcidic between 75% and 25% labeled 2, and basic-like composition with \(R_{\text{Acidic}}\leq 20\%\) labeled 3. Therefore, according to the acidic similarities, the ores belong to neutral components, and fault muds and soils belong to acidic components. Three types of samples were clearly divided into two different components. In summary, TEM observation and energy spectrum analysis showed that Au nanoparticles were found in the ores, fault muds, and soils above the concealed ore body, but not in the soils around the concealed ore body. At the same time, the element composition also proves that Au is much higher in the soils above the concealed ore body than in the soils around the concealed ore body. The LG03 lithogene shows that the ores are neutral components, and the fault muds and soils are acidic components; their sources are different, thus excluding the possibility that the soils above the concealed ore body are formed by ore weathering. This also provides an explanation for the source of the high concentration of \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Sample** & **S508** & **S509** & **S506** & **S507** & **FS01** & **FS02** & **R01** & **R02** \\ \hline LG03 & 11202020202 & 12202020202 & 11201020202 & 12201020202 & 1202020202 & 10202020211 & 120202020212 & 12120111200 \\ LG03\_R\({}_{\text{Acidic}}\) (\%) & 95 & 90 & 90 & 85 & 100 & 90 & 55 & 40 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Gene similarities of 8 samples with different sampling points. Au in the top soil of the ore, that is, by the migration of the bottom ore, which also provides a basis for soil fine-grained prospecting (Figure 3).