The metavolcanics contain gold-bearing quartz veins in the area between Oroville, Cherokee City, and Oregon City. Gold-quartz veins are also present at Magalia. ... Adding to this the 50,000 ounces representing the early production of the Persch-baker mine, we arrive at a minimum total of about 66,000 ounces for the district.
Bring family and embark on a unique gold prospecting adventure at LDMA Burnt River Mining Camp in Eastern Oregon. From one day to the next, Burnt River offers breathtaking views of nature's finest. ... both within LDMA Vein Mountain and its surroundings. The property is dotted with numerous gold-bearing quartz veins, making it an ideal ...
The geochemistry, origin, and hydrothermal alteration mapping associated with the gold-bearing quartz veins at Hamash district, South Eastern Desert, Egypt
These overpressured fluids caused hydrofracturing to complete brecciation of segments of the earlier quartz veins and associated pre-existing breccias, with deposition of auriferous quartz-sulfide veins and breccia cements or matrices within them.
INITIAL INVESTIGATION OF SAMPLES OF THE VIRTUE MINE, OREGON: A STUDY INTO THE TEXTURAL, MINERALOGICAL, AND GEOCHEMICAL …
has resulted in the formation of various types of cross-cutting quartz veins that have not yet been fully described and classified. 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.
Scattered grains are also found in the sulfide-bearing schist adjacent to the quartz veins. Large masses of coarse sheet and wire gold are commonly associated with galena in the Maryland mine (fig. 8).
Oregon mining, Sumpter Oregon, Oregon gold mining. OREGON MINES ... with veins running north and south. The district is four miles wide and 18 miles long. Still further west of Baker City is the Cable Cove district. ... The placer miners discovered most of the gold-bearing quartz ledges in the area and hard rock mining began in the Sumpter ...
At least 75% of gold produced in the State of Oregon came from the Blue Mountains. Most gold within the Blue Mountains was mined from orogenic gold veins and associated placer deposits. ... formation and exposure of gold-bearing veins are linked with the tectonic history of the western North American Cordillera, ... Several other quartz …
The Blue Mountains gold belt in eastern Oregon, USA, produced some 48 t (∼1.7 M oz) of orogenic gold from narrow veins, not including placers, mostly during the …
The veins are comprised of discontinuous gold-bearing quartz seams up to 2 ft in thickness that occur in sheared argillite along the major faults that separate Elkhorn Ridge Argillite …
The gold behavior of the several ore types can be summarized as follows: gold in placers, quartz vein gold ores, and oxidized ores are easily liberated, and can be recovered by gravity, flotation, and cyanidation; gold in copper sulphide ores is often coarse-grained and associated with copper minerals, and can be recovered into a …
Lode mining began as early as 1859 on the Gold Hill vein in Jackson County (Raymond, 1870, p. 214-232) ; gold-bearing quartz veins were also worked in the 1860's in the Canyon Creek district, the Eagle Creek …
In British Columbia, the gold veins occur in replacement deposits at or near contacts of metamorphic with dioritic igneous rocks, the gangue being garnet, epidote, calcite, etc., and the "minerals" mispickel, pyrite and copper pyrites (Hedley); in quartz fissure veins in phyllite, (a rock intermedíate between slate and mica schist ...
It is characterized by the intrusion of pegmatites or quartz veins in M-UMR accompanied by huge hydrothermal fluid circulation and metasomatism with the formation of emerald-bearing desilicated pegmatite (plumasite) and biotite schist.
before 1900; lode vein mines in this area were successfully developed ... bearing quartz veins to the Precambrian rocks of the Wickenburg area through the use of detailed geologic mapping, structural analysis, petrography, fluid inclusion studies, and isotopic dating. ...
In Egyptian deposits, the gold-bearing quartz veins include pyrite, arsenopyrite, subordinate chalcopyrite, sphalerite, galena, tetrahedrite, and rare stibnite. ... On the mine sites, the quartz veins that cut across these granitic rocks are set in pronounced alteration zones rich in gold and sulfides and mostly stained with iron oxides.
With several active claims, the district is known for its gold-bearing quartz veins. Prospectors in this area engage in more traditional forms of hard-rock mining.
One type of deposit that should be reevaluated is gold bearing quartz veins (GBQV). This project focuses on a GBQV deposit located in the Virtue mining …
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. A summary of the quartz samples used for LA–ICP–MS trace element analysis and their detailed features are shown in Table 1. For each sample, paired thin and thick sections …
294 GOLD AND SILVER IN OREGON Principal Mines I / Lawler mine: The Lawler mine, located on White Bull Mountain and Dry Gulch, was_the original ... 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 ...
The veins are comprised of discontinuous gold-bearing quartz seams up to 2 ft in thickness that occur in sheared argillite along the major faults that separate Elkhorn Ridge Argillite ('hPer) from metamorphosed intrusive and extrusive rocks and TtPmv).
We have re-investigated the paragenesis and mineral compositions of the emerald occurrence at the Rist mine, Hiddenite, North Carolina, in order to provide a foundation for fluid-inclusion and isotopic studies, and to examine the possible relationship between emerald and spodumene mineralization and granitic pegmatites. Beryl and …
While mining continued into the 1860's and beyond along the Klamath River, gold bearing quartz wasn't discovered until the 1870's in Rocky Gulch and the hills west of Henley in Siskiyou County.
The Quartz Mountain Gold Deposit, located in the vicinity of Bly, Oregon, is an important site within the Quarz Mountain Mining District. This mining district is currently encompassed by the Fremont National Forest.
Wolframite-bearing quartz veins generally exhibit arborization and crosses in slate, granite or metasandstone, forming ore-bearing quartz veins with large width variation . Numerous associated sulfides, such as pyrite, arsenopyrite and chalcopyrite, were identified in the middle of the quartz vein (Figure 3C).
This study investigates the structural control of the numerous gold occurrences in the southern part of the Barberton Greenstone Belt in the Malolotja and Steynsdorp areas. The gold-bearing event distribution is studied using field structural geology associated with a petrological and microstructural analysis. Three major tectonic …
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 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, …
Sulfide and gold-bearing quartz veins fill fractures in the Jurassic sediments and greenstone. Masses of igneous rock of Jurassic or Cretaceous age that range in …