The polymetal mining area is located 30 kilometers northwest of Birjand, South Khorasan Province of Iran. Considering the importance of recognizing the geochemical limit value for post-analysis studies, the limit value (= non-normative visualization) in the data of the stream was identified and described using the classic and modern statistical method. Sampling method in this area was lithogeochemical samples. Simple statistical methods, K-Means, K-Medoids, Fuzzy C-Mean (FCM), Self-Organized Map (SOM), have been used in this study. Anomaly maps are depicted in each method and separated from the background. Each method showed different anomalies, but the K-Mean and K-Medoids methods had similar responses.