Example Sentences

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Valuing Ore in Course of Breaking.—There are many ores whose payability can be determined by inspection, but there are many of which it cannot.

From Principles of Mining Valuation, Organization and Administration by Hoover, Herbert

As to the ratio of silver in the copper, or to the cakes, there does not, except the limit of payability, seem to have been any difficulty on the minimum side.

From De Re Metallica, Translated from the First Latin Edition of 1556 by Agricola, Georgius

There are cases of large, very low-grade mines where to abandon one-half the ore as pillars is more profitable than total extraction, but the margin of payability in such ore must be very, very narrow.

From Principles of Mining Valuation, Organization and Administration by Hoover, Herbert

Where values fade into the walls, as in impregnation deposits, the width of stopes depends upon the limit of payability.

From Principles of Mining Valuation, Organization and Administration by Hoover, Herbert