The Sampling And Estimation of Ore in a Mine
The Sampling And Estimation of Ore in a Mine
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Positive Ore. — Ore exposed on all sides.
2. Probable Ore. — Ore exposed on two or three sides.
3. Possible Ore. — Ore below the lowest level, or, as Mr. Argyll expresses it, "below the last visible ore." The use of these three simple words is recommended to engineers.
Benj. B. Lawrence.
New York, Feb. 21, 1903.
The Editor : Sir. — Mr. Collins now defines his position as objecting to "the same expressions to denote estimates of ore in a pockety fissure-vein and a comparatively regular impreg- n...ated bed, merely because both are exposed on one, two or more sides." Here we differ radically, assuming, for the sake of argument, such an unusual phenomenon as a "com- paratively regular impregnated bed" ; the engineer would use a lower factor of correction in dealing with the latter than in the case of a pockety fissure- vein, to the end that in either case his estimates may be as near correct as he can get them. So long as mines are developed by levels and winzes, or the counterpart of the latter — raises — the present method of estimating ore reserves in blocks will in all probability prevail and a block with all sides exposed will also receive a hieher estimate than those with one or more concealed sides.
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You can find similar books in the "Read Also" column, or choose other free books by T a Thomas Arthur Rickard to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Positive Ore. — Ore exposed on all sides.
2. Probable Ore. — Ore exposed on two or three sides.
3. Possible Ore. — Ore below the lowest level, or, as Mr. Argyll expresses it, "below the last visible ore." The use of these three simple words is recommended to engineers.
Benj. B. Lawrence.
New York, Feb. 21, 1903.
The Editor : Sir. — Mr. Collins now defines his position as objecting to "the same expressions to denote estimates of ore in a pockety fissure-vein and a comparatively regular impreg- n...ated bed, merely because both are exposed on one, two or more sides." Here we differ radically, assuming, for the sake of argument, such an unusual phenomenon as a "com- paratively regular impregnated bed" ; the engineer would use a lower factor of correction in dealing with the latter than in the case of a pockety fissure- vein, to the end that in either case his estimates may be as near correct as he can get them. So long as mines are developed by levels and winzes, or the counterpart of the latter — raises — the present method of estimating ore reserves in blocks will in all probability prevail and a block with all sides exposed will also receive a hieher estimate than those with one or more concealed sides.
What to read after The Sampling And Estimation of Ore in a Mine?
You can find similar books in the "Read Also" column, or choose other free books by T a Thomas Arthur Rickard to read onlineMoreLess
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