Abstract: The problems by the presence of mining companies is not only inflicting damages to nature, but also causing damages to the social environment. This research aims to study the social injustice by the presence of mining companies in Tayan Hilir of Sanggau District in Indonesia. This research used the qualitative approach with a descriptive method. This research data retrieval used purposif technique in which the data was taken from both the informant of the companies and the relocated communities. Then, it was processed using qualitative analysis with described the social injustice by the presence of mining companies. The results explain the social injustices of government policies which favoured the compannies by giving capital and supports which lead them more superior and acting half "force" against the the communities. Whereas, the communities who have limited information and power to bargain got harmed in economical side. They lost their livelihood that was previously available, this occurs because the new area of relocation is not suitable for their livelihood. Based on facts, the land concessions in Semerah village did not match with the contract agreement. The company offered a relocation area but it is remote and there are no public facilities. In addition, ownership status of the land is not clear.