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" poverty of ore is only made up by its facility of transport, the moderate expense of fuel, or the convenience of smelting. Its richness may in general be judged of by the color; if of a fine yellow hue, and yielding readily to the hammer, it may be considered... "
A System of Mineralogy: Including an Extended Treatise on Crystallography ... - Page 409
de James Dwight Dana - 1837 - 571 pages
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A system of mineralogy: comprising the most recent discoveries: including ...

James Dwight Dana - 1850 - 711 pages
...generally only 7 or 8, and occasionally so little as 3 or 4 per cent of metal. In the Tatter case, such poverty of ore is only made up by its facility of...judged of by the color; if of a fine yellow hue, and readily yielding to the hammer, it may be considered a good ore ; but if hard, and pale-yellow, it...
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Manual of mineralogy: including observations on mines, rocks, reduction of ...

James Dwight Dana - 1851 - 432 pages
...generally only 7 or 8, and occasionally as little as 3 to 4 per cent, of metal. In the latter case such poverty of ore. is only made up by its facility of...fuel, or the convenience of smelting. Its richness may generally be judged of from the color : if of a fine yellow hue, and yielding readily to the hammer,...
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A System of Mineralogy Comprising the Most Recent Discoveries

James D. Dana - 1854
...Redruth rarely yielding 12, generally only 7 or 8, and occasionally but 8 or 4- per cent, of metal. Its richness may in general be judged of by the color ; if of a fine yellow hue, and readily yielding to the hammer, it may be considered a good ore; but if hard, and pale-yellow, it is...
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A System of Mineralogy: Comprising the Most Recent ..., Volumes 1 à 2

James Dwight Dana - 1854 - 533 pages
...generally only 7 or 8, and occasionally but 3 or 4 per cent. of metal. Its richness may in general bo judged of by the color; if of a fine yellow hue, and readily yielding to the hammer, it niny be considered a good ore; but it hard, and pale-yellow, it...
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Manual Of Mineralogy

James D. Dana, A.M. - 1855
...generally only 7 or 8, and occasionally as little as 3 to 4 per cent, of metal. In the latter case such poverty of ore is only made up by its facility of...fuel, or the convenience of smelting. Its richness may generally be judged of from the color : if of a fine yellow hue, and yielding readily to the hammer,...
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Manual of Mineralogy

James Dwight Dana - 1855 - 432 pages
...generally only 7 or 8, and occasionally as little as 3 to 4 per cent, of metal. In the latter case such poverty of ore is only made up by its facility of...fuel, or the convenience of smelting. Its richness may generally be judged of from the color : if of a fine yellow hue, and yielding readily to the hammer,...
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MANUAL OF MINERALOGY (1857)

JAMES D. DANA, A.M. - 1857
...generally only 7 or 8, and occasionally as little as 3 to 4 per cent, of metal. In the latter case such poverty of ore is only made up by its facility of...fuel, or the convenience of smelting. Its richness may generally be judged of from the color : if of a fine yellow hue, and yielding readily to the hammer,...
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Manual of Mineralogy, Including Observations on Mines, Rocks, Reduction of ...

James Dwight Dana - 1864 - 456 pages
...generally only 7 or 8, and occasionally as little as 3 to 4 per cent, of metal. In the latter case such poverty of ore is only made up by its facility of...fuel, or the convenience of smelting. Its richness may generally be judged of from the color: if of a fine yellow hue, and yielding readily to the hammer,...
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A Dictionary of chemistry and the allied branches of other sciences, Volume 2

1864
...cent., generally only 7 or 8, and sometimes only 3 or 4 per cent, of copper. If of a fine yellow colour and yielding readily to the hammer, it may be considered a good ore ; but if hard and pale yellow, it is poor, from admixture of iron pyrites. The copper beds of Falü un in Sweden are...
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Manual of Mineralogy: Including Observations on Mines, Rocks, Reduction of ...

James Dwight Dana - 1866 - 454 pages
...or 8, and occasionally as little as 3^ to 4 per cent, of metal. In the latter case such poverty ff ore is only made up by its facility of transport,...the moderate expense of fuel, or the convenience of smeltinar Its richness may generally be judged of from the color : tf of a fine yellow hue, and yielding...
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