Brazil regulator orders partial halt at Sigma Lithium mine over 'imminent risk'

RIO DE JANEIRO, Sept 30 (Reuters) - Brazil's mining regulator ANM has ordered Sigma Lithium SGML.V to halt mining activities in part of its Grota do Cirilo mine, citing an unspecified "imminent risk," according to a document seen by Reuters on Wednesday.

• The agency ordered immediate corrective work to begin on the eastern slope of the mine's north pit, where it said there was a "ruptured section"

• The area will remain under interdiction until the company completes the work on the eastern slope, ANM said

• ANM also demanded a number of measures to mitigate risks at the mine, adding that it "will take appropriate measures in the event of non-compliance"

• It is unclear how much the stoppage will affect Sigma's mining activities, already impacted by the recent suspension of its environmental licenses and an interdiction on its waste piles

• Sigma did not immediately reply to a request for comment