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Consolidated statements of cash flows - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities      
Profit before income tax S/ 127,112 S/ 185,122 S/ 297,909
Non-cash adjustments to reconcile profit before income tax to net cash flows      
Depreciation and amortization 124,206 111,266 70,810
Finance costs 73,759 75,397 36,807
Impairment on brine project 47,582  
Long-term incentive plan 11,401 16,088 14,159
Provision of impairment of inventories, net 2,718 3,493 8,909
Adjustment as a result of physical inventories 2,700 4,683 2,548
Estimation of impairment of trade and other accounts receivables 1,190 114 315
Unrealized exchange difference related to monetary transactions 185 (1,268) (10,029)
Finance income (5,842) (3,251) (3,478)
Net (gain) loss on disposal of property, plant and equipment (42) 3,445 (6,674)
Net gain on sale of available-for-sale investments (243)
Change in the estimation of rehabilitation costs 5,259 514
Other operating, net 477 220 1,217
Working capital adjustments      
(Increase) decrease in trade and other receivables (31,178) 28,079 (6,230)
Decrease (increase) in prepayments 4,662 (734) (1,985)
(Increase) decrease in inventories (31,863) (49,967) 5,135
Increase (decrease) in trade and other payables 14,083 (36,203) 2,949
Adjustments to reconcile profit (loss) 340,907 341,743 412,876
Interest received 2,251 2,619 3,176
Interest paid (52,346) (48,000) (43,200)
Income tax paid (40,404) (54,683) (97,208)
Net cash flows from operating activities 250,408 241,679 275,644
Which includes cash used in discontinued operations for (2,611) (14,647) (9,421)
Investing activities      
Purchase of property, plant and equipment (71,355) (126,449) (471,179)
Purchase of exploration and evaluation assets (6,331) (10,619) (12,187)
Proceeds from sale of property, plant and equipment 6,353 1,441 7,499
Proceeds from sale of available -for -sale investment 694
Net cash flows used in investing activities (70,639) (135,627) (475,867)
Which includes cash used in investment activities of discontinued operations for (6,410) (22,352) (42,737)
Financing activities      
Dividends paid (124,993) (154,401) (162,168)
Purchase of treasury shares (34,216) (108,218)
Payment of hedge finance cost (26,708) (27,624) (15,898)
Contribution of non-controlling interests 491 4,488 28,475
Net cash flows used in financing activities (185,426) (177,537) (257,809)
Which includes cash provided by financing activities of discontinued operations for 4,015 28,198
Net decrease in cash and cash equivalents (5,657) (71,485) (458,032)
Net foreign exchange difference (185) 1,268 35,540
Cash and cash equivalents as of January 1 80,215 158,007 580,499
Cash transferred to discontinued operations (34,178)
Change in cash and cash equivalents of discontinued operations 9,021 (7,575)
Cash and cash equivalents as of December 31 49,216 80,215 158,007
Unrealized exchange difference related to monetary transactions 185 (1,268) (10,029)
Purchase of property, plant and equipment, pending liquidation 7,441
Sale of property, plant and equipment, pending collection 8,419 4,034
Deferred income tax on costs related to the purchase of treasury shares S/ (2,253) S/ 30