Summary

Mahlon Pitney Stratton's Independence v. Howbert…

It is not correct, from either the theoretical or the practical standpoint, to say that a mining corporation is not engaged in business, but is merely occupied in converting its capital assets from one form into another. The sale outright of a mining property might be fairly described as a mere conversion of the capital from land into money. But when a company is digging pits, sinking shafts, tunneling, drifting, stoping, drilling, blasting, and hoisting ores, it is employing capital and labor in transmuting a part of the realty into personalty, and putting it into marketable form.
Source: Wikisource

Mahlon Pitney Stratton's Independence v. Howbert…

It was reasonable that Congress should fix upon gross income, without distinction as to source, as a convenient and sufficiently accurate index of the importance of the business transacted. And from this point of view, it makes little difference that the income may arise from a business that theoretically or practically involves a wasting of capital.
Source: Wikisource

Mahlon Pitney Stratton's Independence v. Howbert…

As to the alleged inequality of operation between mining corporations and others, it is of course true that the revenues derived from the working of mines result to some extent in the exhaustion of the capital. But the same is true of the earnings of the human brain and hand when unaided by capital, yet such earnings are commonly dealt with in legislation as income.
Source: Wikisource

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