INCOME TAXES (Mining Royalty Taxes) (Details)	12 Months Ended		1 Months Ended
	Dec. 31, 2014	Dec. 31, 2019	Jul. 31, 2012
Chile [Member]
Mining royalty taxes by location [Line Items]
Foreign Income Tax Rate	35.00%
Peru [Member]
Mining royalty taxes by location [Line Items]
Foreign Income Tax Rate	30.00%	26.00%
Cerro Verde [Member]
Mining royalty taxes by location [Line Items]
Foreign Income Tax Rate			30.00%
Foreign Income Tax Rate Under New Stability Agreegment	32.00%		32.00%
Expiration Date, Stability Agreement	Dec. 31, 2028
2010 [Member] | Chile [Member] | Stabilized Rate [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2010 [Member] | Chile [Member] | Minimum [Member] | Special Mining Burden [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2010 [Member] | Chile [Member] | Maximum [Member] | Special Mining Burden [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	9.00%
2011 [Member] | Chile [Member] | Stabilized Rate [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2011 [Member] | Chile [Member] | Minimum [Member] | Special Mining Burden [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2011 [Member] | Chile [Member] | Maximum [Member] | Special Mining Burden [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	9.00%
2012 [Member] | Chile [Member] | Stabilized Rate [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2012 [Member] | Chile [Member] | Minimum [Member] | Special Mining Burden [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2012 [Member] | Chile [Member] | Maximum [Member] | Special Mining Burden [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	9.00%
2013 [Member] | Chile [Member] | Stabilized Rate [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2013 [Member] | Chile [Member] | Special Mining Burden [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2014 [Member] | Chile [Member] | Stabilized Rate [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2014 [Member] | Chile [Member] | Special Mining Burden [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2014 [Member] | Peru [Member]
Mining royalty taxes by location [Line Items]
Dividend Tax Rate	4.10%
2015 [Member] | Chile [Member]
Mining royalty taxes by location [Line Items]
Foreign Income Tax Rate	35.00%
2015 [Member] | Chile [Member] | Stabilized Rate [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2015 [Member] | Chile [Member] | Special Mining Burden [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2016 [Member] | Chile [Member]
Mining royalty taxes by location [Line Items]
Foreign Income Tax Rate	35.00%
2016 [Member] | Chile [Member] | Stabilized Rate [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2016 [Member] | Chile [Member] | Special Mining Burden [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2017 [Member] | Chile [Member]
Mining royalty taxes by location [Line Items]
Foreign Income Tax Rate	44.00%
2017 [Member] | Chile [Member] | Stabilized Rate [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2017 [Member] | Chile [Member] | Special Mining Burden [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	4.00%
2018 [Member] | Chile [Member]
Mining royalty taxes by location [Line Items]
Foreign Income Tax Rate	44.50%
2018 [Member] | Chile [Member] | Minimum [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	5.00%
2018 [Member] | Chile [Member] | Maximum [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	14.00%
2019 [Member] | Chile [Member] | Minimum [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	5.00%
2019 [Member] | Chile [Member] | Maximum [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	14.00%
2019 [Member] | Peru [Member]
Mining royalty taxes by location [Line Items]
Dividend Tax Rate	9.30%
2020 [Member] | Chile [Member] | Minimum [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	5.00%
2020 [Member] | Chile [Member] | Maximum [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	14.00%
2021 [Member] | Chile [Member] | Minimum [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	5.00%
2021 [Member] | Chile [Member] | Maximum [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	14.00%
2022 [Member] | Chile [Member] | Minimum [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	5.00%
2022 [Member] | Chile [Member] | Maximum [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	14.00%
2023 [Member] | Chile [Member] | Minimum [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	5.00%
2023 [Member] | Chile [Member] | Maximum [Member]
Mining royalty taxes by location [Line Items]
Mining royalty tax rate	14.00%