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SUBSEQUENT EVENTS: (Details) $ / shares in Units, $ in Millions	Apr. 23, 2020 $ / shares	Apr. 16, 2020 USD ($)	Apr. 15, 2020 USD ($)	Jul. 15, 2019 complaint
Tia Maria | Peru
SUBSEQUENT EVENTS:
Number of complaints | complaint				3
Subsequent Events
SUBSEQUENT EVENTS:
Quarterly dividend authorized (in dollars per share) | $ / shares	$ 0.20
Fixed-rate senior unsecured notes issued April 2010 | Subsequent Events
SUBSEQUENT EVENTS:
Debt term		10 years
Repayment of debt		$ 410.8	$ 400.0
Repayment of principal		400.0
Accrued interest paid		$ 10.8

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