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CONCENTRATION OF RISK: (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) item	Dec. 31, 2022	Dec. 31, 2021
Concentration of risk
Number of open-pit copper mines | item	4
Number of underground poly metallic mines | item	5
Number of smelters | item	2
Number of refineries | item	9
Total cash and short-term investment	$ 1,750.8
Cash equivalents
Concentration of risk
Total cash and short-term investment	$ 1,750.8
Percentage of total cash	100.00%
Percentage of cash in US dollars	98.00%
Cash equivalents | United States
Concentration of risk
Total cash and short-term investment	$ 1,294.9
Percentage of total cash	74.00%
Percentage invested in one institution of country	14.70%
Percentage invested in one institution of total cash	10.90%
Cash equivalents | Canada
Concentration of risk
Total cash and short-term investment	$ 122.0
Percentage of total cash	7.00%
Percentage invested in one institution of country	100.00%
Percentage invested in one institution of total cash	7.00%
Cash equivalents | Switzerland
Concentration of risk
Total cash and short-term investment	$ 222.3
Percentage of total cash	12.70%
Percentage invested in one institution of country	100.00%
Percentage invested in one institution of total cash	12.70%
Cash equivalents | Peru
Concentration of risk
Total cash and short-term investment	$ 26.5
Percentage of total cash	1.50%
Percentage invested in one institution of country	87.80%
Percentage invested in one institution of total cash	1.30%
Cash equivalents | Mexico
Concentration of risk
Total cash and short-term investment	$ 85.1
Percentage of total cash	4.80%
Percentage invested in one institution of country	87.10%
Percentage invested in one institution of total cash	4.20%
Accounts receivable trade | Five largest customers | Customer
Concentration of risk
Percentage of accounts receivable and total sales	32.60%	34.20%	31.30%
Accounts receivable trade | Largest customer | Customer
Concentration of risk
Percentage of accounts receivable and total sales	9.70%	10.40%	11.80%
Total sales | Five largest customers | Customer
Concentration of risk
Percentage of accounts receivable and total sales	24.70%	25.70%	25.00%
Total sales | Largest customer | Customer
Concentration of risk
Percentage of accounts receivable and total sales	7.70%	6.80%	7.20%

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Number of open pit copper mines which represent long-lived, depletable assets that represent the legal right to explore, extract and retain some or all portions of the benefits from mining.

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Number of underground poly metal mines which represent long-lived, depletable assets that represent the legal right to explore, extract and retain some or all portions of the benefits from mining.

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