SIGNIFICANT JUDGMENTS, ESTIMATES AND ASSUMPTIONS	12 Months Ended
Dec. 31, 2017
SIGNIFICANT JUDGMENTS, ESTIMATES AND ASSUMPTIONS
SIGNIFICANT JUDGMENTS, ESTIMATES AND ASSUMPTIONS	5.SIGNIFICANT JUDGMENTS, ESTIMATES AND ASSUMPTIONS The preparation of the Company’s financial statements in conformity with IFRS requires management to make judgments, estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Estimates and assumptions are continually evaluated and are based on management’s experience and other factors, including expectations of future events that are believed to be reasonable under the circumstances. Actual results could differ from these estimates. i.Significant Judgments in Applying Accounting Policies The areas which require management to make significant judgments in applying the Company’s accounting policies in determining carrying values include, but are not limited to: (a)Mineral Reserves and Mineral Resources The information relating to the geological data on the size, depth and shape of the ore body requires complex geological judgments to interpret the data. Changes in the proven and probable mineral reserves or measured and indicated and inferred mineral resources estimates may impact the carrying value of property, plant and equipment, goodwill, reclamation and remediation obligations, recognition of deferred tax amounts and depreciation, depletion and amortization. (b)Depreciation, depletion and amortization Significant judgment is involved in the determination of useful life and residual values for the computation of depreciation, depletion and amortization and no assurance can be given that actual useful lives and residual values will not differ significantly from current assumptions. (c)Taxes The Company is subject to income taxes in numerous jurisdictions. Significant judgment is required in determining the provision for income taxes, due to the complexity of legislation. There are many transactions and calculations for which the ultimate tax determination is uncertain during the ordinary course of business. ii.Significant Accounting Estimates and Assumptions The areas which require management to make significant estimates and assumptions in determining carrying values include, but are not limited to: (a)Mineral Reserves and Mineral Resources Proven and probable mineral reserves are the economically mineable parts of the Company’s measured and indicated mineral resources demonstrated by at least a preliminary feasibility study. The Company estimates its proven and probable mineral reserves and measured and indicated and inferred mineral resources based on information compiled by appropriately qualified persons. The estimation of future cash flows related to proven and probable mineral reserves is based upon factors such as estimates of foreign exchange rates, commodity prices, future capital requirements and production costs along with geological assumptions and judgments made in estimating the size and grade of the ore body. Changes in the proven and probable mineral reserves or measured and indicated and inferred mineral resources estimates may impact the carrying value of property, plant and equipment, goodwill, reclamation and remediation obligations, recognition of deferred tax amounts and depreciation, depletion and amortization. (b)Purchase Price Allocation Applying the acquisition method to business combinations requires each identifiable asset and liability to be measured at its acquisition-date fair value. The excess, if any, of the fair value of consideration over the fair value of the net identifiable assets acquired is recognized as goodwill. The determination of the acquisition-date fair values often requires management to make assumptions and estimates about future events. The assumptions and estimates relating to determining the fair value of property, plant and equipment acquired generally require a high degree of judgment, and include estimates of mineral reserves acquired, future metal prices and discount rates. Changes in any of the assumptions or estimates used in determining the fair value of acquired assets and liabilities could affect the amounts assigned to assets, liabilities and goodwill in the purchase price allocation. (c)Depreciation, depletion and amortization Plants and other facilities used directly in mining activities are depreciated using the UOP method over a period not to exceed the estimated life of the ore body based on recoverable ounces to be mined from proven and probable reserves. Mobile and other equipment is depreciated, net of residual value, on a straight-line basis, over the useful life of the equipment but does not exceed the related estimated life of the mine based on proven and probable reserves. The calculation of the UOP rate, and therefore the annual depreciation, depletion and amortization expense, could be materially affected by changes in the underlying estimates. Changes in estimates can be the result of actual future production differing from current forecasts of future production, expansion of mineral reserves through exploration activities, differences between estimated and actual costs of mining and differences in gold price used in the estimation of mineral reserves. (d)Valuation of goodwill and long-lived assets Goodwill is tested for impairment annually or more frequently if there is an indication of impairment. The carrying value of property, plant and equipment is reviewed each reporting period to determine whether there is any indication of impairment or reversal of impairment. If the carrying amount of an asset exceeds its recoverable amount, the asset is impaired and an impairment loss is recognized in the consolidated statement of operations. For property, plant and equipment and other long-lived assets, a reversal of previously recognized impairment losses is recognized in the consolidated statement of operations if there has been a change in the estimates used to determine the asset’s recoverable amount since the last impairment loss was recognized. The assessment of fair values, including those of the CGUs for purposes of testing goodwill and long-lived assets, require the use of estimates and assumptions for recoverable production, future and long-term commodity prices, discount rates, NAV multiples, foreign exchange rates, future capital requirements and operating performance. Changes in any of the assumptions or estimates used in determining the fair value of goodwill or other long-lived assets could impact the impairment analysis. (e)Inventories Expenditures incurred, and depreciation, depletion and amortization of assets used in mining and processing activities are deferred and accumulated as the cost of ore in stockpiles, ore on leach pads, in-process and finished metal inventories. These deferred amounts are carried at the lower of average cost or NRV. Write-downs of ore in stockpiles, ore on leach pads, in-process and finished metal inventories resulting from NRV impairments are reported as a component of current period costs. The primary factors that influence the need to record write-downs include prevailing and long-term metal prices and prevailing costs for production inputs such as labour, fuel and energy, materials and supplies, as well as realized ore grades and actual production levels. Costs are attributed to the leach pads based on current mining costs, including applicable depreciation, depletion and amortization relating to mining operations incurred up to the point of placing the ore on the pad. Costs are removed from the leach pad based on the average cost per recoverable ounce of gold on the leach pad as the gold is recovered. Estimates of recoverable gold on the leach pads are calculated from the quantities of ore placed on the pads, the grade of ore placed on the leach pads and an estimated percentage of recovery. Timing and ultimate actual recovery of gold contained on leach pads can vary significantly from the estimates. The quantities of recoverable gold placed on the leach pads are reconciled to the quantities of gold actually recovered (metallurgical balancing), by comparing the grades of ore placed on the leach pads to actual ounces recovered. The nature of the leaching process inherently limits the ability to precisely monitor inventory levels. As a result, the metallurgical balancing process is constantly monitored and the engineering estimates are refined based on actual results over time. The ultimate actual recovery of gold from a pad will not be known until the leaching process is completed. The allocation of costs to ore in stockpiles, ore on leach pads and in-process inventories and the determination of NRV involve the use of estimates. There is a high degree of judgment in estimating future costs, future production levels, forecasted usage of supplies inventory, proven and probable reserves estimates, gold and silver prices, and the ultimate estimated recovery for ore on leach pads. There can be no assurance that actual results will not differ significantly from estimates used in the determination of the carrying value of inventories. (f)Provision for reclamation and remediation The Company assesses its provision for reclamation and remediation on an annual basis or when new material information becomes available. Mining and exploration activities are subject to various laws and regulations governing the protection of the environment. In general, these laws and regulations are continually changing and the Company has made, and intends to make in the future, expenditures to comply with such laws and regulations. Accounting for reclamation and remediation obligations requires management to make estimates of the future costs the Company will incur to complete the reclamation and remediation work required to comply with existing laws and regulations at each mining operation. Actual costs incurred may differ from those amounts estimated. Also, future changes to environmental laws and regulations could increase the extent of reclamation and remediation work required to be performed by the Company. Increases in future costs could materially impact the amounts charged to operations for reclamation and remediation. The provision represents management’s best estimate of the present value of the future reclamation and remediation obligation. The actual future expenditures may differ from the amounts currently provided. (g)Deferred taxes The Company recognizes the deferred tax benefit related to deferred income and resource tax assets to the extent recovery is probable. Assessing the recoverability of deferred income tax assets requires management to make estimates of future taxable profit. To the extent that future cash flows and taxable profit differ significantly from estimates, the ability of the Company to realize the net deferred tax assets recorded at the balance sheet date could be impacted. In addition, future changes in tax laws could limit the ability of the Company to obtain tax deductions in future periods from deferred income and resource tax assets. (h)Contingencies Due to the size, complexity and nature of the Company’s operations, various legal and tax matters are outstanding from time to time. Contingencies can be possible assets or liabilities arising from past events which, by their nature, will only be resolved when one or more future events not wholly within our control occur or fail to occur. The assessment of such contingencies involves the use of significant judgment and estimates. In the event that management’s estimate of the future resolution of these matters changes, the Company will recognize the effects of the changes in its consolidated financial statements on the date such changes occur.

5.SIGNIFICANT JUDGMENTS, ESTIMATES AND ASSUMPTIONS

The preparation of the Company’s financial statements in conformity with IFRS requires management to make judgments, estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Estimates and assumptions are continually evaluated and are based on management’s experience and other factors, including expectations of future events that are believed to be reasonable under the circumstances. Actual results could differ from these estimates.

i.Significant Judgments in Applying Accounting Policies

The areas which require management to make significant judgments in applying the Company’s accounting policies in determining carrying values include, but are not limited to:

(a)Mineral Reserves and Mineral Resources

The information relating to the geological data on the size, depth and shape of the ore body requires complex geological judgments to interpret the data. Changes in the proven and probable mineral reserves or measured and indicated and inferred mineral resources estimates may impact the carrying value of property, plant and equipment, goodwill, reclamation and remediation obligations, recognition of deferred tax amounts and depreciation, depletion and amortization.

(b)Depreciation, depletion and amortization

Significant judgment is involved in the determination of useful life and residual values for the computation of depreciation, depletion and amortization and no assurance can be given that actual useful lives and residual values will not differ significantly from current assumptions.

(c)Taxes

The Company is subject to income taxes in numerous jurisdictions. Significant judgment is required in determining the provision for income taxes, due to the complexity of legislation. There are many transactions and calculations for which the ultimate tax determination is uncertain during the ordinary course of business.

ii.Significant Accounting Estimates and Assumptions

The areas which require management to make significant estimates and assumptions in determining carrying values include, but are not limited to:

(a)Mineral Reserves and Mineral Resources

Proven and probable mineral reserves are the economically mineable parts of the Company’s measured and indicated mineral resources demonstrated by at least a preliminary feasibility study. The Company estimates its proven and probable mineral reserves and measured and indicated and inferred mineral resources based on information compiled by appropriately qualified persons. The estimation of future cash flows related to proven and probable mineral reserves is based upon factors such as estimates of foreign exchange rates, commodity prices, future capital requirements and production costs along with geological assumptions and judgments made in estimating the size and grade of the ore body. Changes in the proven and probable mineral reserves or measured and indicated and inferred mineral resources estimates may impact the carrying value of property, plant and equipment, goodwill, reclamation and remediation obligations, recognition of deferred tax amounts and depreciation, depletion and amortization.

(b)Purchase Price Allocation

Applying the acquisition method to business combinations requires each identifiable asset and liability to be measured at its acquisition-date fair value. The excess, if any, of the fair value of consideration over the fair value of the net identifiable assets acquired is recognized as goodwill. The determination of the acquisition-date fair values often requires management to make assumptions and estimates about future events. The assumptions and estimates relating to determining the fair value of property, plant and equipment acquired generally require a high degree of judgment, and include estimates of mineral reserves acquired, future metal prices and discount rates. Changes in any of the assumptions or estimates used in determining the fair value of acquired assets and liabilities could affect the amounts assigned to assets, liabilities and goodwill in the purchase price allocation.

(c)Depreciation, depletion and amortization

Plants and other facilities used directly in mining activities are depreciated using the UOP method over a period not to exceed the estimated life of the ore body based on recoverable ounces to be mined from proven and probable reserves. Mobile and other equipment is depreciated, net of residual value, on a straight-line basis, over the useful life of the equipment but does not exceed the related estimated life of the mine based on proven and probable reserves.

The calculation of the UOP rate, and therefore the annual depreciation, depletion and amortization expense, could be materially affected by changes in the underlying estimates. Changes in estimates can be the result of actual future production differing from current forecasts of future production, expansion of mineral reserves through exploration activities, differences between estimated and actual costs of mining and differences in gold price used in the estimation of mineral reserves.

(d)Valuation of goodwill and long-lived assets

Goodwill is tested for impairment annually or more frequently if there is an indication of impairment. The carrying value of property, plant and equipment is reviewed each reporting period to determine whether there is any indication of impairment or reversal of impairment. If the carrying amount of an asset exceeds its recoverable amount, the asset is impaired and an impairment loss is recognized in the consolidated statement of operations. For property, plant and equipment and other long-lived assets, a reversal of previously recognized impairment losses is recognized in the consolidated statement of operations if there has been a change in the estimates used to determine the asset’s recoverable amount since the last impairment loss was recognized. The assessment of fair values, including those of the CGUs for purposes of testing goodwill and long-lived assets, require the use of estimates and assumptions for recoverable production, future and long-term commodity prices, discount rates, NAV multiples, foreign exchange rates, future capital requirements and operating performance. Changes in any of the assumptions or estimates used in determining the fair value of goodwill or other long-lived assets could impact the impairment analysis.

(e)Inventories

Expenditures incurred, and depreciation, depletion and amortization of assets used in mining and processing activities are deferred and accumulated as the cost of ore in stockpiles, ore on leach pads, in-process and finished metal inventories. These deferred amounts are carried at the lower of average cost or NRV. Write-downs of ore in stockpiles, ore on leach pads, in-process and finished metal inventories resulting from NRV impairments are reported as a component of current period costs. The primary factors that influence the need to record write-downs include prevailing and long-term metal prices and prevailing costs for production inputs such as labour, fuel and energy, materials and supplies, as well as realized ore grades and actual production levels.

Costs are attributed to the leach pads based on current mining costs, including applicable depreciation, depletion and amortization relating to mining operations incurred up to the point of placing the ore on the pad. Costs are removed from the leach pad based on the average cost per recoverable ounce of gold on the leach pad as the gold is recovered. Estimates of recoverable gold on the leach pads are calculated from the quantities of ore placed on the pads, the grade of ore placed on the leach pads and an estimated percentage of recovery. Timing and ultimate actual recovery of gold contained on leach pads can vary significantly from the estimates. The quantities of recoverable gold placed on the leach pads are reconciled to the quantities of gold actually recovered (metallurgical balancing), by comparing the grades of ore placed on the leach pads to actual ounces recovered. The nature of the leaching process inherently limits the ability to precisely monitor inventory levels. As a result, the metallurgical balancing process is constantly monitored and the engineering estimates are refined based on actual results over time. The ultimate actual recovery of gold from a pad will not be known until the leaching process is completed.

The allocation of costs to ore in stockpiles, ore on leach pads and in-process inventories and the determination of NRV involve the use of estimates. There is a high degree of judgment in estimating future costs, future production levels, forecasted usage of supplies inventory, proven and probable reserves estimates, gold and silver prices, and the ultimate estimated recovery for ore on leach pads. There can be no assurance that actual results will not differ significantly from estimates used in the determination of the carrying value of inventories.

(f)Provision for reclamation and remediation

The Company assesses its provision for reclamation and remediation on an annual basis or when new material information becomes available. Mining and exploration activities are subject to various laws and regulations governing the protection of the environment. In general, these laws and regulations are continually changing and the Company has made, and intends to make in the future, expenditures to comply with such laws and regulations. Accounting for reclamation and remediation obligations requires management to make estimates of the future costs the Company will incur to complete the reclamation and remediation work required to comply with existing laws and regulations at each mining operation. Actual costs incurred may differ from those amounts estimated. Also, future changes to environmental laws and regulations could increase the extent of reclamation and remediation work required to be performed by the Company. Increases in future costs could materially impact the amounts charged to operations for reclamation and remediation. The provision represents management’s best estimate of the present value of the future reclamation and remediation obligation. The actual future expenditures may differ from the amounts currently provided.

(g)Deferred taxes

The Company recognizes the deferred tax benefit related to deferred income and resource tax assets to the extent recovery is probable. Assessing the recoverability of deferred income tax assets requires management to make estimates of future taxable profit. To the extent that future cash flows and taxable profit differ significantly from estimates, the ability of the Company to realize the net deferred tax assets recorded at the balance sheet date could be impacted. In addition, future changes in tax laws could limit the ability of the Company to obtain tax deductions in future periods from deferred income and resource tax assets.

(h)Contingencies

Due to the size, complexity and nature of the Company’s operations, various legal and tax matters are outstanding from time to time. Contingencies can be possible assets or liabilities arising from past events which, by their nature, will only be resolved when one or more future events not wholly within our control occur or fail to occur. The assessment of such contingencies involves the use of significant judgment and estimates. In the event that management’s estimate of the future resolution of these matters changes, the Company will recognize the effects of the changes in its consolidated financial statements on the date such changes occur.