| James Nicol - 1873 - 372 pages
...sometimes only 3 or 4 per cent. The richness of the ore may in general be judged of by the colour ; if of a fine yellow hue, and yielding readily to the...it may be considered a good ore ; but if hard and pale yellow, it is assuredly a poor one, being mixed with iron pyrites. From U BORNITE—DOMEYKITE.... | |
| James Dwight Dana, George Jarvis Brush - 1875 - 998 pages
...generally only 7 or 8, and occasionally but 3 or 4 per cent, of metal. Its richness may in gênerai be judged of by the color; if of a fine yellow hue, and readily yielding to the hammer, it may bo considered a good ore; but if hard, and pale-yellow, it is... | |
| James Dwight Dana - 1876 - 472 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,... | |
| James Dwight Dana - 1876 - 458 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,... | |
| James Dwight Dana - 1877 - 470 pages
...generally only 7 or 8, and occasion, ally 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,... | |
| James Dwight Dana - 1879 - 496 pages
...be considered an average of the produce of the total quantity of ore sold." (Phillips, 1874.) 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,... | |
| Henry Watts - 1882 - 1046 pages
...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 Fahlun in Sweden are also... | |
| James Dwight Dana - 1886 - 516 pages
...be considered an average of the produce of the total quantity of ore sold." (Phillips, 1874.) 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,... | |
| James Dwight Dana - 1887 - 570 pages
...be considered an average of the produce of the total quantity of ore sold/' ([Phillips, 1874.) 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,... | |
| James Dwight Dana - 1894 - 540 pages
...be considered an average of the produce of the total quantity of ore sold." (Phillips, 1874.) 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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