The country's environmental agency OEFA detected a "flow of a greenish solution" into the nearby Torata River in the waste deposit area of the copper mine, located in the Moquegua region.
The company says it has seen a significant improvement over the past year, with prices up about 20%, but believes conditions are not where they need to be to restart idled capacity.
SolGold is frustrated at the rejection of its planned bid for Canadian firm Cornerstone, which holds 15% of the Cascabel copper-gold project in Ecuador.
About 700 people were evacuated from two towns located near tailings dams operated by Vale and ArcelorMittal on mounting fears after last month's breach at Brumadinho, the country's deadliest mine disaster.
