SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Policies)	6 Months Ended
Jun. 30, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:
Long-term inventory - Ore stockpiles on leach pads	Long-term inventory-Ore stockpiles on leach pads: On January 1, 2020, the Company aligned its capitalization method for its Peruvian and Mexican operations to capitalize based on the allocation of copper content recoverable between ore and leach material. In addition, the inventory consumption is now valued at the average unit cost, instead of the declining percentages of recovery method used previously. As a result of these changes, the value of capitalized material decreased by $48.8 million and the consumption increased by $10.3 million. Management has evaluated ASC 250-10 and considered appropriate guidance to conclude that the above mentioned classified as a change in accounting estimate and therefore should affect accounting books prospectively. Management believes that this new method will result in a more appropriate value of this material.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Policies)

6 Months Ended

Jun. 30, 2020

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

Long-term inventory - Ore stockpiles on leach pads

Long-term inventory-Ore stockpiles on leach pads:

On January 1, 2020, the Company aligned its capitalization method for its Peruvian and Mexican operations to capitalize based on the allocation of copper content recoverable between ore and leach material. In addition, the inventory consumption is now valued at the average unit cost, instead of the declining percentages of recovery method used previously. As a result of these changes, the value of capitalized material decreased by $48.8 million and the consumption increased by $10.3 million.

Management has evaluated ASC 250-10 and considered appropriate guidance to conclude that the above mentioned classified as a change in accounting estimate and therefore should affect accounting books prospectively. Management believes that this new method will result in a more appropriate value of this material.