deduction is completely discretionary; 
the operator can claim the full amount 
in the year incurred or carry forward the 
unclaimed expenditures indefinitely. 

Depreciation Allowance 

An allowance for depreciation may 
be claimed in respect of depreciable 
property
. The rates for 2013 are shown 
in Table 9.

The allowance for new and existing 
mining assets is discretionary except 
during a period of exemption for a new 
mine or a major expansion of an existing 
mine (see below), when a deduction 
of 30% or 15%, respectively, must 
be taken. Similarly, the allowance for 
processing assets is discretionary except 
during a period of exemption, when a 
deduction of 15% must be taken.

Asset Rehabilitation Expenses

The Mining Tax Act provides that 
reclamation expenses are deductible 
in the year in which such expenses are 
incurred. There is no provision for a 
carryforward or carryback. However, as 
a matter of administrative practice, the 
Ministry of Finance (Ontario) may, in 
certain circumstances, allow the mining 

operator to carry reclamation expenses 
back to the last full year of commercial 
production.

Processing Allowance

An annual processing allowance 
deduction may be claimed. The 
processing allowance is computed 
as follows:

• Where the output has been 

processed in a concentrator 
located in Canada and owned by 
the operator at the end of the year, 
the processing allowance is equal to 
8% of the cost of these processing 
assets.

• Where the output has been 

processed in a concentrator and a 
smelter both of which are located in 
Canada and owned by the operator 
at the end of the year, the processing 
allowance is equal to 12% of the cost 
of these processing assets.

• Where the output has been processed 

in a concentrator, a smelter, and a 
refinery all of which are located in 
Canada and owned by the operator 
at the end of the year, the processing 
allowance is equal to 16% of the cost 
of these processing assets.

• Where the output has been 

processed in a concentrator, a 
smelter, a refinery, and a semi-
fabricating plant all of which are 
located in Northern Ontario and 
owned by the operator at the end of 
the year, the processing allowance 
is equal to 20% of the cost of these 
processing assets.

An operator that does not own 
processing assets and sells output that 
has been processed by another person 
on behalf of the operator is entitled to 
claim a processing allowance equal to 
15% of the operator’s profit for the year.

An operator that owns processing 
assets and sells processed output 
in a year may claim a processing 
allowance of not less than 15% of the 
operator’s profit and not more than 65% 
of that profit.

No processing allowance is allowed 
in respect of processing carried on 
outside Canada.

Tax Exemption for a New Mine 

or Major Expansion of an 

Existing Mine

An operator that starts up a new mine 
or undertakes a major expansion of an 
existing mine is entitled to a mining tax 
exemption. The exemption covers the 
36 months commencing from the time 
the new or expanded mine comes into 
commercial production to a maximum of 
the first $10 million of profits.

Remote Mine Incentives

Special incentives are provided for 
mining operations in remote areas of the 
province. Where a new mining operation 
is certified as a remote mine, the tax 
exemption referred to above is extended 

Table 9: Depreciation Rates for Depreciable Mining Assets, Ontario 
as at June 30,  2013

Asset Category

Rate

Basis

New mining assets

30%

straight-line basis

Other mining assets

15%

straight-line basis

Assets acquired before the 
commencement of production 
of a new mine or from a major 
expansion of an existing mine

100% but not in excess 
of the amount of profit 
from the mine in the year 

Processing and transportation 
assets

15%

straight-line basis

Social assets

0%

n/a

© 2013 KPMG LLP, a Canadian limited liability partnership and a member firm of the KPMG network of independent member firms 
affiliated with KPMG International Cooperative (“KPMG International”), a Swiss entity. All rights reserved.

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 A Guide to Canadian Mining Taxation