## 3 Traditional Geochemical Mapping  
The total 1170 lgSn concentrations of stream sediments in the Gejuu area are illustrated in Figure 2a as a histogram with an accompanying box plot [24]. The statistical parameters for Sn and lgSn are listed in Table 1. Furthermore, lgSn data without outliers are illustrated in Figure 2b and their statistical parameters are also listed in Table 1. The outlier data of lgSn were excluded repeatedly when out of the range of Avg\(\pm\)3*Std. The 1170 Sn concentration data in the Gejuu area range from 0.2 ug/g to 7760 ug/g and are close to a log-normal distribution. When the outliers are excluded, the average and standard deviation of 1074 data for lgSn are 0.88 and 0.36, respectively, and the median is 0.83 (Table 1). Three traditional methods, namely cumulative frequency, logarithmic interval, and Avg\(\pm\)k\(\times\)Std, were used to contour Sn geochemical maps in the Gejuu area based on 1170 Sn concentrations. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**No.**} & **Method** & **Level** & **\(\mathbf{\theta}\)** & **0** & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** & **9** & **10** & **11** & **12** & **13** & **14** & **15** & **16** & **17** & **18** & **19** \\ \hline \multirow{2}{*}{1} & **Conservative** & \(\times\) & 0 & 0.5 & 1.2 & 2 & 3 & 4.5 & 8 & 13 & 25 & 40 & 60 & 75 & 85 & 92 & 95.5 & 97 & 96 & 98.8 & 99.5 & 100 \\  & **Frequency** & **S** & **m** & 1.1 & 15 & 2.0 & 2.2 & 2.3 & 2.9 & 3.6 & 4.4 & 60 & 10 & 17 & 30 & 100 & 300 & 800 & 1200 & 1920 & 3178 & max \\  & **S** & **m** & 0.041 & 0.8 & 0.20 & 0.3 & 0.3 & 0.6 & 0.6 & 0.6 & 0.6 & 0.6 & 0.75 & 1.00 & 1.23 & 1.98 & 2.00 & 254 & 2.99 & 3.08 & 1.28 & 3.50 & - \\  & **S** & **m** & 0.13 & 0.12 & 0.04 & 0.02 & 0.10 & 0.09 & 0.09 & 0.13 & 0.22 & 0.23 & 0.25 & 0.52 & 0.54 & 0.39 & 0.15 & 0.29 & 0.22 & - \\ \hline \multirow{2}{*}{2} & **L**ognormal** & **L**ognormal** & **l**/gln & **1.0 & 0.1 & 0.2 & 0.3 & 0.4 & 0.5 & 0.6 & 0.7 & 0.8 & 0.9 & 1.0 & 1.1 & 1.2 & 1.3 & 1.4 & 1.5 & 1.6 & 1.7 & 1 gmax \\  & **S** & **m** & 1.0 & 1.25 & 1.6 & 2.2 & 2.3 & 3.2 & 4 & 9 & 4.3 & 8 & 30 & 12.5 & 14 & 20 & 25 & 32 & 40 & 50 & max \\  & **S** & **m** & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & 0.1 & - \\ \hline \multirow{2}{*}{3} & **Agg-Sold** & **l**/gln & **1.0 & 0.1 & 0.0 & 0.1 & 0.0 & 0.3 & 0.4 & 0.52 & 0.70 & 0.88 & 1.06 & 1.24 & 1.42 & 1.00 & 1.09 & 1.78 & 1.36 & 2.05 & 1 gmax \\  & **S** & **m** & -0.3 & -2.75 & -2.25 & -2.25 & -1.5 & -1.3 & -0.0 & 0.0 & 0.5 & 1.5 & 1.5 & 2.5 & 2.25 & 2.75 & 3.3 & 2.55 & - \\  & **S** & **m** & 0.6 & 0.8 & 1.0 & 1.2 & 1.4 & 2.2 & 3.3 & 5.6 & 7.6 & 1.1 & 1.7 & 26.0 & 40 & 0.9 & 0.6 & 7.8 & 91 & 112 & max \\  & **S** & **m** & - & 0.09 & 0.09 & 0.09 & 0.09 & 0.13 & 0.18 & 0.18 & 0.18 & 0.18 & 0.18 & 0.18 & 0.18 & 0.18 & 0.09 & 0.09 & 0.09 & 0.09 & - \\ \hline \multirow{2}{*}{-} & **C** & **C** & **-** & **1** & **2** & **3** & **2** & **5** & **130** & **7** & **217** & **244** & 250** & 255 & 254 & 240 & 227 & 175 & 146 & 127 \\  & **S** & **m** & 0 & 0 & 65 & 90 & 136 & 196 & 221 & 244 & 255 & 258 & 250 & 250 & 154 & 22 & 21 & 30 & 7 \\  & **B** & **m** & 172 & 215 & 244 & 266 & 255 & 258 & 252 & 211 & 176 & 127 & 81 & 65 & 23 & 17 & 10 & 0 & 44 & 22 & 0 \\ \hline \hline \end{tabular} Note: The unit is up / g of Smoothness. Any is 0.8 and Sd is 0.3 or /gln with outliers excluded k is a multiple of Sd.  
\end{table} 
Table 2: Sn geochemical map information from the Geju area using traditional methods. In Figure 3, the highest Sn values are illustrated in red tones and are located in the Gejuu super-large Sn deposit cluster in the west. The Bainiuchang deposit area in the northeast and the Guanfang-Bozhushan area in the east mainly comprise yellow tones, indicating relatively lower values with respect to the Gejuu super-large Sn deposit cluster in the west.