Mineral resources of Alaska, report on progress of investigations in 1911--Gold deposits of the Seward-Sunrise region, Kenai Peninsula

10.3133/b520e ◽  
1912 ◽  
Keyword(s):  
Mineral Resources ◽  
Gold Deposits ◽  
Kenai Peninsula

Pioneering Geologic Studies of the Black Hills, Dakota Territory, USA

2005 ◽  
Vol 24 (2) ◽  
pp. 175-196 ◽  
Author(s):  
K. Aalto
Keyword(s):  
Mineral Resources ◽  
Gold Deposits ◽  
Black Hills ◽  
John Wesley ◽  
Geologic History ◽  
History Of ◽  
Geologic Map ◽  
Field Season ◽  
Thin Section Petrography ◽  
John Wesley Powell

Discovery of significant gold deposits in the Black Hills, Dakota Territory, in the early 1870s led to a Congressional mandate that organized geological exploration of the Hills be undertaken. Ferdinand V. Hayden (1829-1887), who had previously visited the region, principally to collect fossils, was thwarted in his efforts to oversee such exploration by the combined efforts of John Strong Newberry (1822-1892) and John Wesley Powell (1834-1902), who instead promoted Walter P. Jenney (1850-1904?) and Henry Newton (1845-1877), both colleagues of Newberry at the Columbia College School of Mines. In a four-month field season the Jenney/Newton Survey (1875) carefully examined some 6,000 square miles of the Black Hills. Newton then oversaw production of an extensive report on the geology, mineral resources and other aspects of natural history. The report included a detailed geologic map, numerous stratigraphic columns, interpretive figures illustrating the geomorphic evolution of the Hills, thin section petrography of samples collected and a general discussion of the geologic history. Of note are Newton's interpretations of laccolith formation and drainage evolution. Despite Congressional approval funding production, the publication of the report was delayed until 1880, after Newton's untimely death in 1877 during a second visit to the Hills. It appeared under the auspices of John Wesley Powell's Geographical and Geological Survey of the Rocky Mountains Region. G. K. Gilbert (1843-1918) unofficially edited the final version of the report, using Newton's notes, drafts and figures. However, Newton should justly receive credit for its excellence.

scholarly journals Main Dike Swarm of the Northern Part of the Chakylkalyan Megablock and Their Potential Ore Content (On the Example of the Yakhton Dike Swarm, Southern Uzbekistan)

2020 ◽  
Vol 6 (11) ◽  
pp. 104-116
Author(s):  
T. Yarboboev ◽  
Sh. Sultanov ◽  
I. Ochilov
Keyword(s):  
Genetic Relationships ◽  
Mining Industry ◽  
Mineral Resources ◽  
Geological Structure ◽  
Gold Deposits ◽  
Ore Deposits ◽  
Stable Operation ◽  
Dike Swarm ◽  
Geochemical Properties ◽  
Lower Stage

The study of mineralogical and geochemical properties of gold deposits is an urgent task for the geological industry, especially in the new areas under study. Without reliable information about the geological factors that lead to the formation of ore deposits and the mechanisms of deposit accumulation, it is impossible to ensure reliable scientific forecasting of the mineral potential of the regions, the effective creation of mineral resources of enterprises and mining, the stable operation of the mining industry. Our study of gold deposits was aimed at understanding these important issues of the ore formation problem. This is the urgency of the case. The role of the dictators of the Yakhton ore deposit as important structural material and mineral components of the leading types of ore-magmatic systems is being assessed. A peculiar feature of the geological structure of the ore area is the close paragenetic relationship of mineralization by rocks of the dike kids complex. Mineralization is localized in two stages and has bimetallic properties (gold, tungsten). The mineralization in the upper layer is localized in the corpus carbonate rocks of Yakhton (mainly garnet-pyroxene content). In the lower stage, mineralization is governed by a northeastern tectonic attenuation zone, which includes area concentrations of Au and W and areal mineralized zones that are part of the dike of the Yakhton region. Determining the spatial, age, and genetic relationships of mineralization with magmatism is a major problem of metallogeny.

scholarly journals GOLD AND MERCURY IN THE PROCESSES OF ORE FORMATION IN KAMCHATKA

2018 ◽  
pp. 54-60
Author(s):  
V. A. STEPANOV
Keyword(s):  
Chemical Properties ◽  
Mineral Resources ◽  
Gold Deposits ◽  
Ore Deposits ◽  
Ore Formation ◽  
Natural Processes ◽  
The Difference ◽  
Physical And Chemical ◽  
Gold Mercury ◽  
And Chemical Properties

The main features of the difference and similarity of the physical and chemical properties of gold and mercury have been given, which  determine their behavior in the natural processes of formation of  deposits of both metals in Kamchatka. It has been shown that the  difference in the properties of gold and mercury led to the  emergence of independent monometallic deposits, differing in  connection with intrusive formations, in depth and temperature of  ore formation. The similarity of the properties of these elements  determined the appearance of mercury minerals on gold ore deposits and gold in mercury deposits, as well as the formation of complex  gold-mercury deposits. Four geological-industrial types of gold- mercury deposits have been distinguished: the Knoxville, the Carlin,  the Kyuchus and the Chemlian ones, which include deposits with  large gold reserves both abroad and in Russia. The identification of  gold deposits, including through the revision of mercury ore  occurrences and deposits of Kamchatka for gold presence, will strengthen the mineral resources base of gold in this region.

scholarly journals Geology and lode gold deposits of the Nuka Bay area, Kenai Peninsula, Alaska

1968 ◽  
Author(s):  
Donald H. Richter
Keyword(s):  
Gold Deposits ◽  
Kenai Peninsula ◽  
Lode Gold ◽  
Bay Area ◽  
Lode Gold Deposits

scholarly journals Application and Significance of Geological, Geochemical, and Geophysical Methods in the Nanpo Gold Field in Laos

Minerals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 96
Author(s):  
Jie Gan ◽  
Hui Li ◽  
Zhengwei He ◽  
Yu Gan ◽  
Junqing Mu ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Large Scale ◽  
Geophysical Methods ◽  
Mineral Resources ◽  
Mining Area ◽  
Gold Deposits ◽  
Rock Body ◽  
Metallogenic Province ◽  
Geochemical Anomalies ◽  
Ore Bodies

As the main part of the Indosinian metallogenic province in the eastern part of the Tethys metallogenic domain, Southeast Asia has experienced multiple stages of tectonic magnetic activities accompanied by the formation of rich mineral resources. However, due to the undeveloped economy, low degree of geological work, dense vegetation cover, and lack of obvious prospecting marks, traditional geological prospecting work in the area is not optimal. Consequently, the combination of high-precision geophysics and geochemistry has become an important method of looking for ore bodies deep underground in this area. The Nanpo gold deposit is a hydrothermal gold deposit that occurs in the Indosinian felsic volcanic rock body, and its mineralization is closely related to felsic magmatism. This study carried out comprehensive geophysical and geochemical exploration methods of soil geochemical survey, induced polarization (IP) survey, and audio-frequency magnetotelluric (AMT) survey. Based on the characteristics of geophysical and geochemical anomalies, geological inference, and interpretation, the integrated geophysical and geochemical prospecting criteria of the ore area have been determined: The large-scale and overlapping Au-Ag-Cu anomaly area in the host felsic magmatic rocks (mainly diorite, monzodiorite and granodiorite) is a favorable metallogenic area. Two anomalies, P1–H1 and P3–H6, with the best metallogenetic conditions and the deepest extensions of the known ore bodies, were further selected as engineering verification targets. After the study of the drill core, gold (mineralized) bodies consistent with the anomalies were found, indicating that the combined method is suitable for the exploration of mineral resources in this area, and the prospecting effect is good. At the same time, the metallogenic prediction shows that the deep part of the mining area still has great metallogenic prospects and prospecting potential. The characteristics of geophysical and geochemical anomalies and prospecting experience in the study area can provide references for the prospecting of hydrothermal gold deposits in the Luang Prabang–Loei structural belt.

Objective method for analysis of mineral resources supply on the example of Russia

2022 ◽  
pp. 6-21
Author(s):  
Irina Egorova ◽  
Boris Mikhailov
Keyword(s):  
Mineral Resources ◽  
Gold Deposits ◽  
Current Level ◽  
Objective Method ◽  
Geological Exploration ◽  
Resource Base ◽  
Gold Production ◽  
Mineral Production ◽  
Nickel Lead

A forecast of nonfuel mineral production in Russia is considered, based on the integration of the expected life of specific deposits currently exploited and developed. It is shown that mineral safety is fully ensured for copper, nickel, lead, tungsten and tin, whose reserves are sufficient for their extraction, at least at the current level, for 40–50 years and there are real prospects for its significant growth. The sufficiency of other minerals is much lower: for molybdenum and chromium, it is limited to about 30 years, and the extraction of zinc and uranium in Russia may significantly decrease in 20 years. The situation is more difficult with the most liquid solid minerals, like gold and diamonds. The commissioning of mining enterprises at the developed gold deposits can ensure a rapid growth in the production of the precious metal in the coming years. However, at the beginning of the next decade, the resource base depletion of the Olimpiada field and a number of other exploited deposits is predicted. The projects currently implemented for the development of new fields do not compensate for the lost capacity. This may account for a long-term (until the beginning of the 2050s) decline in the Russian gold production, which may be halved against the current level by the end of this period. Such a scenario can only be avoided with the intensification of geological exploration in the coming years. The earlier decrease in the number of diamonds mined in Russia, associated with the depletion of reserves of exploited pipes, is predicted (since 2025). Unless new deposits are discovered and developed, the domestic production of precious stones will steadily decline and, in the 2040s, may be reduced fourfold.

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