Rankle
发表于 2025-3-23 11:26:06
https://doi.org/10.1007/978-3-030-47247-4 the most important conversions and conversion factors mainly related to the “imperial” system of measures common in the Anglo-American field are listed. Although many countries, such as Canada or Australia, have adopted the metric system, time and again the exploration geologist will come across non-metric units in old texts.
检查
发表于 2025-3-23 16:28:10
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雇佣兵
发表于 2025-3-23 20:24:06
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杂役
发表于 2025-3-23 22:10:31
Mohammad Ashiqur Rahman,Ehab Al-Shaer amount of ore mined. When considering the production costs, the output per unit of time must also be taken into account. The greater the output per day or per year, the lower are the costs per ton of ore. This effect is called “economics of scale”.
MULTI
发表于 2025-3-24 02:47:57
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无关紧要
发表于 2025-3-24 06:29:55
https://doi.org/10.1007/978-3-030-88132-0For the calculation of the volume and the tonnage of ore deposits there is a variety of available methods to choose from, each suited for a particular deposit. These methods fall into two categories: reserve calculation on the basis of cross-sections and on the basis of longitudinal planar sections or level plans respectively.
slow-wave-sleep
发表于 2025-3-24 12:57:10
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hangdog
发表于 2025-3-24 16:24:22
https://doi.org/10.1007/978-94-009-1675-3Generally speaking, multi-element deposits contain more than one metal as a significant source of revenue. This applies to most non-ferrous metal deposits. Complex volcanogenic sulphide deposits often contain five components: Cu, Pb, Zn, Ag, and Au. In this case, each individual component has to be weighted separately as shown in Chapter 4.
ARIA
发表于 2025-3-24 22:44:20
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addict
发表于 2025-3-25 01:58:52
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