Since Jair Bolsonaro became president of Brazil the number of processes that were opened in order to mine on the territories of Indian reservations have grown tremendously as shown in the article below.
It contains charts showing how it has increased and also a map showing the locations of the processes against the location of the reservations.
https://apublica.org/2020/02/a-mineracao-em-terra-indigena-com-nome-sobrenome-e-cnpj