On July 23 of the current year, Dakota Mining Co. pays $7,830,000 for land estimated to contain 9,000,000 tons of recoverable ore. It installs and pays for machinery costing $900,000 on July 25. The company removes and sells 461,750 tons of ore during its first five months of operations ending on December 31. Depreciation of the machinery is in proportion to the mine's depletion as the machinery will be abandoned after the ore is mined.

(a) If the machine will be used at another site when extraction is complete, how would we depreciate this machine?

Depreciated