Analysis on Dynamic Changes of Roliai Laterite Nickel Mine from 2013 to 2020

In order to accurately obtain the mining activities of Roliai laterite nickel mine, based on the remote sensing technology and object-oriented image analysis, methods of multi-scale segmentation based on scale optimization and optimal classification threshold selection were used to extract nine mining activity elements from WorldView II images of of 2013 and 2020 respectively. According to the extraction results, the dynamic changes of each element from 2013 to 2020 were analysed from the aspects of area and intensity. Our accuracy evaluation results showed that the overall accuracies of the two extraction results are higher than 90%, and the Kappa coefficients are higher than 0.81. From 2013 to 2020, the mining scale and mining intensity of Roliai laterite nickel mine showed a trend of rapid expansion on the whole, in which the mining area increased the most, reaching 1.02 km 2 , and the average annual change intensity was intense, and the corresponding dump area also increased by about 0.35 km 2 . In the past seven years, Roliai laterite nickel mine has developed from the stage of exploration and mining to forming a relatively complete industrial chain of mining, milling and metallurgyy, entering a development stage of rapid expansion.