The Cost of Mining: An Exhibit of the Results of Important Mines Throughout the World |
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Popular passages
Page 54 - Up to the close of 1865 the total production had amounted to 284,890,055 tons. In the decade from 1866 to 1875, inclusive, the production amounted to 419,425,104 tons, making the total production up to the close of 1875, 704,315,159 tons. In the following decade, from 1876 to 1885, inclusive, the production amounted to 847,760,319 tons, something more than double the total production up to the beginning of that tfecade.
Page 46 - What is the interest of $ 81, for 2 years 14 days, at £ per cent. ? £ per cent. ? £ per cent. ? 2 per cent. ? 3 per cent. ? 4£ per cent. ? 5 per cent. ? 6 per cent. ? 7 per cent. ? 7£ per cent. ? 8 per cent.
Page 54 - This great increase in the production of coal, when considered with the increase in the population, furnishes some further interesting comparisons. Going back for a period of a little over 50 years, or to the middle of the last century, and comparing the statistics of coal production with the increased population, it is found that in 1850, according to the United States census for that year, the production of coal amounted to 6,445,681 tons, when the population of the country amounted to 23,191,876...
Page 54 - Going back for a period of a little over 50 years, or to the middle of the last century, and comparing the statistics of coal production with the increased population, it is found that in 1850, according to the United States census for that year, the production of coal amounted to 6,445,681 tons, when the population of the country amounted to 23,191,876 persons. The per capita production of coal in that year is thus seen to have been 0.278 ton. In 1860, or...
Page 8 - At first thought one is apt to assume that with costs the same the company would receive no profit unless the prices were above 4.43 cents for lead and 51.95 cents for silver. How false such an assumption would be appears from the following : "The...
Page 27 - ... greater. The apparent showing by the superintendent is very bad; but nevertheless he has made for the company $11,250 clear profit on the transaction. " In the first case our total cost for mining, freight, and treatment is only $11.25 per ton; in the second case it is $17.75 per ton, but there is more money in the higher cost. This is an example that has been worked out in practice.
Page 81 - GENERAL. The influencing conditions causing the great losses that are at present incurred are : 1. Cheapness of "coal in place ;" that is, in the seam. 2. Low market prices, resulting from extreme competition. 3. Character of the seam, roof, and floor as determining the method of mining. 4. Surface-subsidence due to mining. 5. Interlaced boundary ownerships. 6. Carelessness in mining operations. The first two factors, taken together, are the controlling ones in most mining operations in influencing...
Page 24 - If the mine is situated far from populous centers the reason is apt to be that the climate or altitude is unfavorable. This generally means that labor is dear and inefficient, supplies costly, transportation difficult and expensive. These factors are likely, therefore, to be affected together, and if one is favorable they are all likely to be favorable and vice versa. The sum total of cost variations that may be due to the coincidence of these external factors is therefore considerable and is sufficient...
Page 349 - The internal factors are such that only a small tonnage can be maintained. Metallurgically the ores are only fair, and while not markedly difficult, do not seem to permit of full treatment at a cost of less than $2 a ton. The explanation, therefore, of the big jump in costs from $1.50 at the Treadwell and $3 at the Homestake to $7 in the San Juan is the cumulative effect of a variety of both external and internal factors. EL OHO, MEXICO The mines at El Oro, Mexico, are well managed; they pay good...
Page 256 - Mississippi Valley, where the cost of living is low, labor abundant, fuel and transportation cheap, and markets close at hand. The internal factors also are favorable to low costs. The depths reached are not great, the orebodies are fairly large. In southeast Missouri the orebodies are persistent, though somewhat irregular, while those of the Joplin field are not only irregular, but non-persistent. In both districts, however, exploration by drilling provides against underground perplexities. In both...