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IRS.gov Website
Current Year Tax Map
Publication 535
taxmap/pubs/p535-031.htm#en_us_publink1000208895

Development Costs(p23)

rule
You can deduct costs paid or incurred during the tax year for developing a mine or any other natural deposit (other than an oil or gas well) located in the United States. These costs must be paid or incurred after the discovery of ores or minerals in commercially marketable quantities. Development costs also include depreciation on improvements used in the development of ores or minerals and costs incurred for you by a contractor. Development costs do not include the costs for the acquisition or improvement of depreciable property.
Instead of deducting development costs in the year paid or incurred, you can elect to treat the cost as deferred expenses and deduct them ratably as the units of produced ores or minerals benefited by the expenses are sold. This election applies each tax year to expenses paid or incurred in that year. Once made, the election is binding for the year and cannot be revoked for any reason.
taxmap/pubs/p535-031.htm#en_us_publink1000208896

How to make the election.(p23)

rule
The election to deduct development costs ratably as the ores or minerals are sold must be made for each mine or other natural deposit by a clear indication on your return or by a statement filed with the IRS office where you file your return. Generally, you must make the election by the due date of the return (including extensions). However, if you timely filed your return for the year without making the election, you can still make the election by filing an amended return within 6 months of the due date of the return (excluding extensions). Clearly indicate the election on your amended return and write "Filed pursuant to section 301.9100-2." File the amended return at the same address you filed the original return.
taxmap/pubs/p535-031.htm#en_us_publink1000208897

Foreign development costs.(p23)

rule
The rules discussed earlier for foreign exploration costs apply to foreign development costs.
taxmap/pubs/p535-031.htm#en_us_publink1000208898

Reduced corporate deductions for development costs.(p23)

rule
The rules discussed earlier for reduced corporate deductions for exploration costs also apply to corporate deductions for development costs.