Contributions to economic geology, 1917, Part I, Metals and nonmetals except fuels--Ore deposits of the northwestern part of the Garnet Range, Montana

The Malmyzh gold-copper porphyry deposit located in the central part of the Khabarovsk region has a rather developed oxidation zone. The object was identified during the exploration and evaluation work in the 70s, but received a negative assessment in terms of prospects for ore gold. LLC “Amur-Minerals” began to geological study of Malmyzh zone in 2005. Exploration work continues at the present time. The mineral composition of primary ore deposits is well studied. While the common minerals like a limonite and goethite are marked for the oxidation zone the most of minerals that may have a typomorphic meaning in solving genetic and other issues are beyond the purview of researchers. The study relevance of the mineral composition of the oxidation zone are due to the fact that its share and intensively oxidized ores account for up to 7% of gold and copper. The authors carried out a mineralogical and technological composition research of the oxidation zone of one of the sites of the Malmyzh deposit using small technological samples. The main part of samples is kaolinized and limonitized diorite porphyrites. In the oxidized ores, there are: limonite, goethite, magnetite, pyrite, less often – arsenopyrite, galena, sphalerite, chalcopyrite, and developed on copper and iron sulfides, covelline, bornite, azurite and malachite. Visible grains (0,2-0,7 mm) were established using mineralogical analysis including instrumental. They are: native gold, platinum, platinum zirconium intermetallic, copper, aluminum, zinc; diamonds are typomorphic minerals of both practical and theoretical importance. Blast tube consisting magmatic-hydrothermal breccias was opened in the northwestern part of site. Thus, the association of the listed minerals is unique and allows to restore the conditions of formation of the oxidation zone and the genesis of primary ores.

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Contributions to economic geology, 1920, Part I, Metals and nonmetals except fuels--Iron-ore deposits near Stanford, Montana

10.3133/b715f ◽

1921 ◽

Keyword(s):

Economic Geology ◽

Iron Ore ◽

Ore Deposits ◽

Iron Ore Deposits

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Contributions to economic geology, 1921, Part I, Metals and nonmetals except fuels--Ore deposits of the Sierrita Mountains, Pima County, Arizona

10.3133/b725j ◽

1922 ◽

Keyword(s):

Economic Geology ◽

Ore Deposits ◽

Pima County

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Making faults run backwards: the Wilson Cycle and ore deposits

Canadian Journal of Earth Sciences ◽

10.1139/cjes-2013-0094 ◽

2014 ◽

Vol 51 (3) ◽

pp. 266-271 ◽

Cited By ~ 2

Author(s):

Jeremy P. Richards

Keyword(s):

Economic Geology ◽

Precious Metal ◽

Mineral Deposit ◽

Ore Deposits ◽

Plate Tectonic ◽

Porphyry Cu ◽

Wilson Cycle ◽

The 1960S ◽

And Function ◽

Epithermal Au

The plate tectonic revolution, culminating with the formulation of the Wilson Cycle, took place over a period of less than a decade in the 1960s and early 1970s. The model provided a framework for understanding the formation of almost every type of mineral deposit then known on Earth, ranging from base and precious metal deposits associated with rifting, to porphyry Cu–Mo and epithermal Au deposits associated with subduction, and collision-related mesothermal Au deposits. By the end of the 1970s, satisfactory tectonic models for most of these deposit types had been established. Modern geological and economic geology research is largely built on these models, which have been expanded in detail but remain largely unchanged in concept and function.

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