Quartz Reef Mining. Primary gold typically happens in quartz veins. The removal of gold ore from these tough quartz veins was traditionally referred to as quartz reef mining. A Prussian engineer, Jacob Brache was the foremost to feel that quartz reefs may have even more gold than alluvial fields.
The physical method of cost allocation is inconsistent for this case, with the main reason that the mining company earns revenues from gold and silver, not lead. Then, the environmental burden has to be ascribed to gold production, because this is the metal that brings the greatest profits.
Traditional cost accounting methods simply allocate costs, down onto the cost ... In Stope Mining Cost $ 207 $ 147 $ 210 $ 130 $ 106 $ 100 $ 163 $ 131 $ 150.
The general principle of cost allocation per activities and on product typical of the ABC method applied in the mining and extractive industry may be simplified in the following way : Fig. 1 Cost allocation per activities and products 3.3 Identification of processes and activities The ABC method involves delimitation of the
The Encyclopedia of Arkansas explains that commercial mining of quartz is rare and occasionally consists of the use of explosives to first expose the quartz, followed by the operation of small hand tools such as chisels and rock picks to extract portions of the mineral from a quarry.
Comparison of Stoping Methods
As an appendix to this article I have collected a number of costs of mining as published in the reports of mining companies. Obviously but few of these reports show the costs of the operations given in Fig. 8, and in order to bring out their detailed costs it is necessary to make certain assumptions. To bring out the costs of the different operations of drilling and blasting, consider the data on North Star, Alaska Treadwell, and the Rand as given in the appendix, with general data on Cripple...
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It is stated in one of the mining books that the cost of lighting for each ton of ore mined is about the same in all mines. This is not the case. The cost varies according to the light used and the number of men underground. The entire subject of mine lighting has been well covered by Frederick H. Morley in the Mining and Scientific Press of April 11, 1914. The following table taken from this article gives the cost of acetylene lighting in 10 of the large metal mines.
Square Set vs. Top Slicing Methods
There is often a question as to whether square setting or top slicing is more economical. For instance, in massive deposits of heavy sulphides the ore is easily drilled and breaks well and if overhand stoping with square sets is used the weight of the ore necessitates very heavy timbering. In order to compare the two methods and also to show cost data on timberingand handling ore in stopes, assume the methods applied to a block of ground 50 ft. square and assume that the development work is t...
The costs of tramming as given in published reports nearly always include not only tramming, but loading also, either from chutes or from the floor of a drift. The following interesting data are from the Engineering and Mining Journal of Mar. 8, 1913. At the Elkton Consolidated Mining Milling Co., Cripple Creek, Colo., the 1911 cost of tramming was 14.6c. per car of approximately 0.7 ton capacity. The South Utah Mines Smelters, Newhouse, Utah, reports its tramming cost for the year ended June 30, 1912, at 15.76c. per ton of ore, which evidently includes the cost of handling waste removed. In Goldfield, Nev., tramming has averaged about 18c. per ton of ore produced from stopes and has ranged from about 14 to 25c. These figures are for actual tons trammed and do not include any shoveling in stopes. At the North Star mine, Grass Valley, Calif., observations show that a man pushes an 18 cu. ft. car about 150 ft. per minute and shovels about 3 tons per hour from a plat into car agai...