Shigen-Chishitsu
Online ISSN : 2185-4033
Print ISSN : 0918-2454
ISSN-L : 0918-2454
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Displaying 1-4 of 4 articles from this issue
Resource News [Special Edition for The Mineral Resources in Mongolia Part4]
  • N. TUNGALAG, S. JARGALAN, O. ODBAYAR
    Article type: Resource News
    2016 Volume 66 Issue 3 Pages 127-133
    Published: 2016
    Released on J-STAGE: August 15, 2018
    JOURNAL FREE ACCESS
    Tungsten and tin are very abundant and economically important metals of Mongolia. There are more than 160 primary and placer deposits of these metals, of which only 20 are primary deposits. The tin and tungsten deposits of Central and Eastern Mongolia are genetically associated with Mesozoic granitoids. These granitoids occur widely in the zone of Mesozoic tectonic and magmatic activity. Most of the tin and tungsten deposits are genetically associated with both “normal” and lithium-fluorine types of granitoids. Greisen and quartz-vein type wolframite and cassiterite deposits are associated with the granites of normal composition. Tantalum-bearing lepidolite-albite and amazonite granites are genetically associated with lithium-fluorine granites, ongonites, rare-earth microclinites and rare-element zwitters. The tin-tungsten mineralization of Mongolia is very diverse, and includes hydrothermal and pegmatitic shows as well as skarns. The most commercially viable hydrothermal deposits containing wolframite and quartz and cassiterite, wolframite and quartz. The highest value in the economy have deposits of tungsten and tin, represented mostly by quartz vein, greisen and placer types, although detailed ore genesis studies of the mineralization have not yet been conducted.
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  • B. ENKHJARGAL, S. JARGALAN
    Article type: Resource News
    2016 Volume 66 Issue 3 Pages 135-146
    Published: 2016
    Released on J-STAGE: August 15, 2018
    JOURNAL FREE ACCESS
    Mongolia is located at the center of Central Asian orogenic belt, which is built at the result of repeatedly occurred accretion, subduction and collision. Therefore, remnants of ancient island arc terrane preserved in the south Mongolia. As analogue with modern island and continental arc setting, ancient arc systems hosts of porphyry type copper-gold and copper-molybdenum deposits in the south Mongolia. Currently, there are more than 160 porphyry type copper deposits and occurrences, from which almost half is distributed in the south Mongolia. Therefore, study of south Mongolian porphyry system is vital importance on widening for mineral exploration activity, as well as better understanding of ancient geodynamic setting.
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Resource News
  • Tetsuya SHOJI
    Article type: Resource News
    2016 Volume 66 Issue 3 Pages 161-189
    Published: 2016
    Released on J-STAGE: August 15, 2018
    JOURNAL FREE ACCESS
    On early 2016, the BCOM (Bloomberg Commodity Index) seems to pass over the bottom where the value was nealy equal to the one recored on middle 2008. Many remarkable results have been reported, however, in the explolation and production fields of minerals and energy resources as follows: 1) the indicated resources became almost two times in the Waterberg PGM project, South Africa, 2) the production of copper cothod started at the Antucoya mine, Chile, 3) the field development plan was approved for the Culzean high pressure and high temperature gas condensate field in UK North Sea, 4) it commenced oil production from Lianzi field situated in a unitized offshore zone straddling Angola and the Republic of Congo, 5) the North West Shelf Project has made a final investment decision on the Greater Western Flank Phase 2 gas fields development project off the north-west coast of Australia, 6) Japanese companies joined exploration projects opareting in offshore oil and gas fields, NE Brazil, and 7) the official opening was held at the Maules Creek coal mine, Australia. A long term LNG sale and purchase has been signed using U.S. Henry Hub natural gas-linked prices, and other following agreements adopted the system. In the geothermal development, offering a type of insurance has been begun in order to ease the concern of hot springs operators about the impact of new geothermal power stations.
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