Mineral reserves and resources The science of geology did not exist in the prein
ID: 106488 • Letter: M
Question
Mineral reserves and resources The science of geology did not exist in the preindustrial world. Then, earth materials of value were found by prospectors. Prospection continues today but is aided by the []of geology. prospection begins with the examination of products of weathering either in place or after transportation Prospection as detrital sediments (clay, silt, sand, gravel or chemical sediments ([]). As these materials can be dug into with a pick and a shovel, the prospector's tools are those and a pan to was for heavy minerals when these are what is sort. https://youtu.beOrhsjVH_L08 https//www.youtube.com/watch? PxfcAhS08u0 The prospector in new territory relies on luck to find something, but, mostly, the [] looks for more of what has already been found by others in a region. The principle of prospection is to "look for lion in lion country." The science of geology began with the thoughts of James Hutton (1726-1797) that he published beginning in 1788. Geology, due to Hutton, has as a principle that Earth is exceedingly [] than historical time. This was revolutionary as the received wisdom of the day that Earth is no older than the 6000 years enumerated in Christian and Mosaic biblical texts. So, slow in its development, in spite of John Playfair's masterful illumination in his Illustrations of the Huttonian theory of the earth, 1802, geology as an accepted science can be dated to the founding of the Geological Society of London in 1807 with just 13 founder members. One of these, Henry Thomas De lessthanorequalto Beche, became the first working geologist appointed (with a salary) by the Board of Ordnance in 1832 to portray, on ordinance maps, rock strata; their related soils, their succession, and their faults and folds. By maps a geological map of the county spring 1834, he was able to publish on four [] maps a geological map of the country of Devon, England. Mineral deposits produced by the weathering of bed rock The common minerals of igneous rock are eight minerals: quartz, orthoclase, plagioclase, muscovite, biotite amphibole, pyroxene, and olivine. These are silicates. At their heart, they are mostly composed of oxygen, [] and aluminum that are so strongly bonded together that these elements are inaccessible for extraction by chemists. However, at Earth's surface, chemical weathering, in producing [], turns the common silicate minerals of igneous rock, except for quartz, to clay and releases salts in solution (ions of Fe, Mg, Mn, Ca, Na and K). These salts accumulate as non-silicate sedimentary minerals containing Fe (hematite, limonite), Mg (dolomite), Mn (wad), Ca (imestone, gpsum, caliche), Na (common salt, natron), and K (sylvite). Grains of quartz released by weathering accumulate after transportation as quartz sand. Clay after transportation accumulates as mud. Chemical weathering of igneous rock also releases minerals that are present and are different from the eight igneous rock minerals (listed above) used for their classification. These are called accessory minerals. The accessory minerals are the first to crystallize in a cooling igneous magma. Usually they to occur in small amounts of less than one percent in the rock by volume and as crystal grains too small be noticed. Some, like quartz, are [] minerals. That is, they are released unchanged by [] weathering. Igneous rock accessory resistate minerals of high specific gravity accumulate as placer deposits of minerals: chromite (containing Cr), diamond (C), ilmenite, rutile and sphene (Ti), magnetite (Fe), found xenotime 0), and zircon (Zr). Except for [] as gems, these accessory minerals no use in preindustrial times but are prized today.Explanation / Answer
1. Ordinance
2. Resistate
3. Prospector
4. Older
5. Science
6. Silicon
7. Salts
8. Soil
9. Chemical
10. Diamonds