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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure of significant accounting policies [text block] [Abstract]

Schedule of impacts of the adoption of IFRS

				As of				Adoption					As of
				December 31				impact					January 1,
		Note		2016				IFRS 16					2017
				ThUS$				ThUS$					ThUS$
													Restated
Current assets
Other non-financial assets, current		12			212,242				(25,567	)	(9)			186,675

Non-current assets
Properties, plants and equipment		17			10,498,149				2,931,101		(9)			13,429,250

Current liabilities
Other current financial liabilities		7-19			1,839,528				311,307		(11)			2,150,835

Non-current liabilities
Other non current financial liabilities		7-19			6,796,952				2,881,149		(11)			9,678,101
Accounts payable commercial and other		7-24			359,391				20,065		(9)			379,456
Deferred tax liability		18			915,759				(61,343	)	(10)			854,416
Equity
Equity attributable to the owners of the parent
Accumulated earnings		25			366,404				(460,173	)	(12)			(93,769	)
Other reserves		25			580,870				215,299		(12)			796,169
Non-controlling interest		14			88,644				(771	)	(12)			87,873

				As of				Adoption										As of				Adoption					As of
				December 31,				impact										January 1				impact					January 1,
		Note		2017				IFRS 9					IFRS 15					2018				IFRS 16					2018
				ThUS$				THUS$					ThUS$					ThUS$				ThUS$					ThUS$
																											Restated
Current assets
Other non-financial assets, current		12			221,188				-					54,361	(4)				275,549				(30,771	)	(9)			244,778
Trade debtors and other accounts receivable, current		7 - 8			1,214,050				(11,105	)	(1)			-					1,202,945				-					1,202,945

Non-current assets
Other non-financial assets, non current		12			220,807				-					-					220,807				(8,604	)	(9)			212,203
Properties, plants and equipment		17			10,065,335				-					-					10,065,335				2,865,317	(9)				12,930,652
Deferred tax assets		18			364,021				89	(2)				6,005	(7)				370,115				449	(10)				370,564

Current liabilities
Other current financial liabilities		7 - 19			1,300,949				-					-					1,300,949				319,030	(11)				1,619,979
Trade and other accounts payables		7 - 20			1,695,202				-					(22,192	)	(5)			1,673,010				(4,398	)	(9)			1,668,612
Other non-financial liabilities, current		22			2,823,963				-					77,640	(6)				2,901,603				-					2,901,603

Non-current liabilities
Other non current financial liabilities		7 - 19			6,605,508				-					-					6,605,508				2,827,942	(11)				9,433,450
Accounts payable commercial and other		7 - 24			498,832				-					-					498,832				60,611	(9)				559,443
Deferred tax liability		18			949,697				(1,021	)	(2)			4,472	(5)				953,148				(75,400	)	(10)			877,748

Equity
Equity attributable to the owners of the Accumulated earnings		25			475,118				(9,995	)	(3)			446	(8)				465,569				(506,581	)	(12)			(41,012	)
Other reserves		25			554,884				-					-					554,884				205,877	(12)				760,761
Non-controlling interest		14			91,147				-					-					91,147				(690	)	(12)			90,457

				As of				Adoption					As of
				December 31,				impact					December 31,
		Note		2018				IFRS 16					2018
				ThUS$				ThUS$					ThUS$
													Restated
Current assets
Other non-financial assets, current		12			320,977				(30,501	)	(9)			290,476

Non-current assets
Other non-financial assets, non current		12			233,741				(6,200	)	(9)			227,541
Properties, plants and equipment		17			9,953,365				2,548,444		(9)			12,501,809
Deferred tax assets		18			273,328				201		(10)			273,529

Current liabilities
Other current financial liabilities		7-19			1,430,789				363,497		(11)			1,794,286

Non-current liabilities
Other non current financial liabilities		7-19			5,864,910				2,494,552		(11)			8,359,462
Accounts payable commercial and other		7-24			483,656				45,621		(9)			529,277
Deferred tax liability		18			872,121				(85,550	)	(10)			786,571
Equity
Equity attributable to the owners of the parent
Accumulated earnings		25			597,676				(378,705	)	(12)			218,971
Other reserves		25			(76,926	)			72,561		(12)			(4,365	)
Non-controlling interest		14			79,940				(32	)	(12)			79,908

Schedule of impairment losses provision

		Portfolio maturity
										Up to				Up to				More than
						Up to				91 to				181 to				360
		Up to date				90 days				180 days				360 days				days				Total
		ThUS$				ThUS$				ThUS$				ThUS$				ThUS$				ThUS$
Expected loss rate			1	%			21	%			46	%			67	%			94	%			8	%
Gross book value			1,046,909				36,241				12,001				14,623				66,022				1,175,796
Impairment provision			(13,570	)			(7,774	)			(5,499	)			(9,803	)			(61,787	)			(98,433	)

Schedule of analyzed business models and classified financial assets and liabilities

		Classification IAS 39																Classification IFRS 9
Assets		Loans and receivables				Hedge and derivatives				Held for trading				Initial as fair value through profit and loss				Cost amortized				At fair value with changes in results				Total
		ThUS$				ThUS$				ThUS$				ThUS$				ThUS$				ThUS$				ThUS$
Balance as of December 31, 2017			2,446,864				62,867				1,915				501,890				-				-				3,013,536
Cash and cash equivalents			(1,112,346	)			-				-				(29,658	)			1,112,346				29,658				-
Other financial assets, current			(23,918	)			-				(1,421	)			(472,232	)			23,918				473,653				-
Trade debtors and other accounts receivable, current			(1,214,050	)			-				-				-				1,214,050				-				-
Accounts receivable from entities related, current			(2,582	)			-				-				-				2,582				-				-
Other financial assets, non-current			(87,077	)			-				(494	)			-				87,077				494				-
Accounts receivable, non-current			(6,891	)			-				-				-				6,891				-				-
Balance as of January 1, 2018			-				62,867				-				-				2,446,864				503,805				3,013,536

		Classification IAS 39								Classification IFRS 9
Liabilities		Others financial liabilities				Held hedge derivatives				Cost amortized				Total
		ThUS$				ThUS$				ThUS$				ThUS$
Balance as of December 31, 2017			10,086,434				14,817				-				10,101,251
Other current financial liabilities			(1,288,749	)			-				1,288,749				-
Trade accounts payable and other accounts payable, current			(1,695,202	)			-				1,695,202				-
Accounts payable to related entities, current			(760	)			-				760				-
Other financial liabilities, not current			(6,602,891	)			-				6,602,891				-
Accounts payable, not current			(498,832	)			-				498,832				-
Balance as of January 1, 2018 (*)			-				14,817				10,086,434				10,101,251

Schedule of effects of changes recognized in the application of IFRS

				For the year ended december 31, 2017
Reconciliation income				Adjustments for reconciliation
				Results under				Adoption impact				Results under
		Nota		IAS 17				IFRS16				IFRS 16
				ThUS$				ThUS$				ThUS$
				Published								Restated
Revenue		26			9,613,907				-				9,613,907
Cost of sales					(7,441,849	)			162,491				(7,279,358	)
Gross margin					2,172,058				162,491				2,334,549

Other income		28			549,889				-				549,889
Distribution costs					(699,600	)			2,816				(696,784	)
Administrative expenses					(938,931	)			(13,837	)			(952,768	)
Other expenses					(368,883	)			3,423				(365,460	)
Other gains (losses)					(7,754	)			-				(7,754	)
Income from operation activities					706,779				154,893				861,672

Financial income					78,695				-				78,695
Financial costs		27			(393,286	)			(185,947	)			(579,233	)
Foreign exchange gains (losses)		29			(18,718	)			(29,780	)			(48,498	)
Result of indexation units					748				-				748
Income (loss) before taxes					374,218				(60,834	)			313,384
Income (loss) tax expense / benefit		18			(173,504	)			14,506				(158,998	)

NET INCOME (LOSS) FOR THE YEAR					200,714				(46,328	)			154,386

Income (loss) attributable to owners of the parent					155,304				(46,408	)			108,896
Income (loss) attributable to non- controlling interest		14			45,410				80				45,490
Net income (loss) for the year					200,714				(46,328	)			154,386

						For the year ended december 31, 2018
Reconciliation Revenue										Adjustments for reconciliation
		Nota				Results under IFRS 15				Adoption impact IFRS 16				Results under IFRS 15				Contract costs (4)				Deferred revenues recognition [(5), (6)]				Reclassifications				Results under IAS 18
						ThUS$				ThUS$				ThUS$				ThUS$				ThUS$				ThUS$				ThUS$
						Published								Restated
														IFRS 16

Revenue			26				9,895,456				-				9,895,456				-				48,561				31,501				9,975,518
Cost of sales							(7,962,843	)			189,411				(7,773,432	)			-				(34,986	)			-				(7,808,418	)
Gross margin							1,932,613				189,411				2,122,024				-				13,575				31,501				2,167,100
Other income			28				472,758				-				472,758				-				-				42,563				515,321
Distribution costs							(619,200	)			3,986				(615,214	)			(43	)			-				(20,003	)			(635,260	)
Administrative expenses							(721,270	)			(15,063	)			(736,333	)			(806	)			-				(54,061	)			(791,200	)
Other expenses							(359,781	)			3,531				(356,250	)			-				-				-				(356,250	)
Other gains (losses)							53,499				-				53,499				-				-				-				53,499
Income from operation activities							758,619				181,865				940,484				(849	)			13,575				-				953,210
Financial income							53,253				-				53,253				-				-				-				53,253
Financial costs			27				(356,269	)			(182,868	)			(539,137	)			-				-				-				(539,137	)
Foreign exchange gains (losses)			29				(157,709	)			119,639				(38,070	)			-				-				-				(38,070	)
Result of indexation units							(865	)			-				(865	)			-				-				-				(865	)
Income (loss) before taxes							297,029				118,636				415,665				(849	)			13,575				-				428,391
Income (loss) tax expense / benefit			18				(83,782	)			9,903				(73,879	)			(23	)			(1,030	)			-				(74,932	)
NET INCOME (LOSS) FOR THE YEAR							213,247				128,539				341,786				(872	)			12,545				-				353,459
Income (loss) attributable to owners of the parent							181,935				127,876				309,811				(872	)			12,545				-				321,484
Income (loss) attributable to non-controlling interest			14				31,312				663				31,975				-				-				-				31,975
Net income (loss) for the period							213,247				128,539				341,786				(872	)			12,545				-				353,459

Disclosure of Effects of Impact Recognized In Application of Ifrs Explanatory

		For the year ended				Adoption					For the year ended
		December 31,				impact					December 31,
		2017				IFRS 16					2017
		ThUS$				ThUS$					ThUS$
											Restated

Payments to suppliers for goods and services			(6,722,713	)			520,082		(1)			(6,202,631	)
Net cash flows from operating activities			(6,722,713	)			520,082					(6,202,631	)

Loans repayments			(1,829,191	)			(344,901	)	(2)			(2,174,092	)
Payments of finance lease liabilities			(344,901	)			344,901		(2)			-
Payments of lease liabilities			-				(338,179	)	(1)			(338,179	)
Interest paid			(389,724	)			(181,903	)	(1)			(571,627	)
Net cash flows (used in) financing activities			(2,563,816	)			(520,082	)				(3,083,898	)

		For the year ended				Adoption					For the year ended
		December 31,				impact					December 31,
		2018				IFRS 16					2018
		ThUS$				ThUS$					ThUS$
											Restated

Payments to suppliers for goods and services			(7,331,390	)			556,387		(1)			(6,775,003	)
Net cash flows from operating activities			(7,331,390	)			556,387					(6,775,003	)

Loans repayments			(1,045,662	)			(692,687	)	(2)			(1,738,349	)
Payments of finance lease liabilities			(692,687	)			692,687		(2)			-
Payments of lease liabilities			-				(373,439	)	(1)			(373,439	)
Interest paid			(357,355	)			(182,948	)	(1)			(540,303	)
Net cash flows (used in) financing activities			(2,095,704	)			(556,387	)				(2,652,091	)