Quartz samples used for LA–ICP–MS trace element and fluid inclusion analyses were collected from quartz-bearing veins of drill holes and mining pits at Meiling.
Within the Blue Mountains gold belt, formation and exposure of gold-bearing veins are linked with the tectonic history of the western North American Cordillera, which is broken …
Read Archean gold-bearing quartz veins at the Sigma Mine, Abitibi greenstone belt, Quebec; Part II, Vein paragenesis and hydrothermal alteration
When you go prospecting, you need to know what rocks to look for based on how gold mines form. Alluvial deposits are made when water flows over rocks in streams and rivers. Gold veins or reefs, on the other hand, are gold deposits that form naturally in large rocks. The first two are secondary deposits, while the third and fourth are main …
Interbedded with these two formations is a greenstone unit. Peridotite and serpentine occupy belts several miles wide within the Jurassic sequence and strike concordantly with the regional north-northeast trend. Sulfide and gold-bearing quartz veins fill fractures in the Jurassic sediments and greenstone.
65 Oat bm Narrow, discontinuous, northerly-striking quartz veins occur in the northern and eastern sec- tions of the quadrangle. The Mountain Belle and Hurdy Gurdy Mines are the only properties with known production from this type of vein, which generally contains free milling gold. The Mountain Belle vein attains a maximum width of 3 ft and consists of …
In terms of their age, geology, mineralogy, paragenesis, and morphology, the gold-bearing vein systems at Merico-Ethel closely resemble the silver-sulfarsenide vein deposits of the historic Cobalt and Gowganda mining camps.
During recent mining activities at the eastern flank of the Kambalda Dome, three types of quartz veins have been observed: barren quartz veins, auriferous quartz veins and pentlandite-bearing quartz veins.
INITIAL INVESTIGATION OF SAMPLES OF THE VIRTUE MINE, OREGON: A STUDY INTO THE TEXTURAL, MINERALOGICAL, AND GEOCHEMICAL PROPERTIES OF …
That $30,000,000 of gold was sent out of Jackson County between 1851 and 1883 testifies that the gold discovery in Southern Oregon was no false Eldorado. The mining of gold was a tremendous factor in the rapid settlement and development of Southern Oregon.
Interbedded with these two formations is a greenstone unit. Peridotite and serpentine occupy belts several miles wide within the Jurassic sequence and strike concordantly …
The Pacific Quartz Mine is located in Placerville, California, in the Placerville Mining District, which is presently encompassed by the Eldorado National Forest. It was initially discovered in the year 1852 and played a significant role in the historical mining activities of the region. As of the time of data entry, the Pacific Quartz Mine is ...
OREGON MINES. Mammoth Mine - Elkhorn Mnts. near Sumpter, OR. In the early 1850s, prospectors first discovered gold in the southern region of what was then Oregon Territory. In the 1860s, gold miners moved into eastern Oregon. In both areas, corporations with outside investors soon replaced small and independent mining operations.
Mineralized zones in tuff and andesite strike northwest. They contain altered si Ii -cified rock with sulfide-bearing quartz veins a few inches wide. A sample of the sulfide-bearing …
The Big Hurrah mine, located near Nome, Alaska, is an example of gold-bearing quartz vein mineralization in an uplifted metamorphic terrain. The host rocks are sheared carbonaceous metasedimentary and metavolcanic rocks that underwent Jurassic regional blueschist metamorphism.
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Within the Blue Mountains gold belt, formation and exposure of gold-bearing veins are linked with the tectonic history of the western North American Cordillera, which is broken into distinct mineral system phases ( Fig. 3, Fig. 4 ).
Using an ore microscope, our studies identified that the alteration zones include gold-bearing sulfide minerals as well as the minerals goethite and malachite. In gold-bearing quartz samples, the concentrations of Cu, As, Ag, and Sb are positively correlated with Au at the degree of shear deformation.
During recent mining activities at the eastern flank of the Kambalda Dome, three types of quartz veins have been observed: barren quartz veins, auriferous quartz veins and pentlandite-bearing quartz veins. Timing and formation conditions of these quartz veins are unknown and pentlandite-bearing quartz veins are of particular interest as
The existing large body of work on quartz vein microstructures in metamorphic rocks ( [ 2] and references therein) forms a starting point for this work on high temperature quartz deformation in porphyry Cu deposits and the connection of quartz deformation microstructures to vein formation.
The Sigma deposit consists of an Archean gold-bearing vein system in metavolcanic rocks intruded by an irregular body of porphyritic diorite, both affected by regional deformation and in turn cut by younger undeformed feldspar porphyry dikes. The veins cut all rock types and are composed chiefly of quartz and tourmaline, with minor amounts of carbonates, …
The veins occupy shear zones in both the metamorphic and granitic rocks. The larger veins strike N. 40° E. and dip 40° W.; many are offset en echelon. Vein minerals consist …
The Sigma deposit consists of an Archean gold-bearing vein system in deformed volcanic rocks intruded by two generations of porphyries. The veins cut all rock types, and wall-rock alteration is superposed on greenschist facies metamorphic assemblages. There are two related vein sets: subvertical veins in ductile shears and subhorizontal veins in …
Archean gold-bearing quartz veins at the Sigma mine occur in deformed metavolcanics intruded by two generations of preore porphyries. The veins were emplaced during a …
Granite is a complex stone, which is why it comes in so many colors. It's loosely defined as a coarse-grained, quartz-rich, intrusive igneous rock. Auriferous granite often contains gold-bearing quartz veins as well, and these veins are generally sought out first by miners due to their higher gold content.
Mineralized zones in tuff and andesite strike northwest. They contain altered si Ii -cified rock with sulfide-bearing quartz veins a few inches wide. A sample of the sulfide-bearing quartz taken by Stowell (1921) about 8 inches wide assayed 0.04 oz./ton gold, 0.86 oz./ton silver, 0.5 percent copper, 3.2 percent lead, and
65 Oat bm Narrow, discontinuous, northerly-striking quartz veins occur in the northern and eastern sec- tions of the quadrangle. The Mountain Belle and Hurdy Gurdy Mines are …
The productive and gold pocket-bearing parts of quartz veins are at or adjacent to a northwest-trending, intensely altered mafic dike, the Colorado dike, that extends apparently uninterrupted from the Colorado Quartz mine across the Artru property and on through the entire length of the Mockingbird claim.
A subvertical gold-bearing Quartz-Fuchsite vein at the Dome mine, Timmins area, is located in a highly carbonatized rock at the contact with a unit of slate. The chemical composition (anhydrous basis) of the wall rock of the vein and diagnostic interelement relations indicate that its protolith is a komatiite.
The geochemistry, origin, and hydrothermal alteration mapping associated with the gold-bearing quartz veins at Hamash district, South Eastern Desert, Egypt
The Morning Star mine is one of numerous historically mined gold-quartz lodes in the Preservation Inlet goldfield of southwest Fiordland. The mine is hosted in Early Ordovician metasedimentary rocks that are composed predominantly of psammitic and pelitic lithologies. These rocks still contain their primary depositional features and are …
