workings. the pacific quartz mine was developed by the 700-foot pacific shaft with levels at 100, 200, 300, 400, 500, 600, and 700. a 1, 365 foot winze at 70 incline sunk from 200 feet north of the shaft on the 700-foot level.
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 highest grade orebody in the Dome mine is a steeply dipping 500 m long, 550 m high, and 3.5 m wide banded quartz-fuchsite vein (QFV) accompanied by subsidiary veins in the adjacent wall rock. The QFV is located in a subvertical zone of carbonatized komatiite near a slate unit and is composed of relatively unstrained …
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 …
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. ... This study focused on understanding the formation of hydrothermal pentlandite-bearing quartz veins which, through aforementioned ...
The Yongjang mine is an Au–Ag deposit near Masan, located at the southernmost tip of the Korean Peninsula. The deposit lies within Cretaceous sedimentary rocks and contains many quartz veins ...
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 …
The Baker Terrane consists mainly of massive intrusions of Jurassic age Granodiorite that is laced with auriferous (gold-bearing) Quartz veins and stringers that host free-milling …
The Cracker Lode deposit, also known as the Columbia-North Pole lode (see Fig. 2), was arguably the most prolific individual orogenic gold deposit in the state of Oregon.It produced ∼11.7 t (∼412k oz) of gold from the Columbia, North Pole, E and E, Golconda, and Taber Fraction mines (Table 1; Brooks and Ramp, 1968) and supplied …
The Sanger mine, the largest producer in the district, yielded an estimated $1.5 million in gold from auriferous quartz veins (Lindgren, 1901, p. 738). The total early production of …
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 late compressional tectonic event and they consist primarily of quartz, tourmaline, carbonates, pyrite, and scheelite. Vein minerals have been deformed and are also cut by abundant …
This proposed selective room-and-pillar mining technique is applicable to any sub-horizontal narrow quartz veins with wolfram, gold, etc. such as the famous La …
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.
Narrow, discontinuous, northerly-striking quartz veins occur in the northern and eastern sec- ... and Alder Creeks. 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 ... A.M., 1914, Ore deposits of northeastern Oregon: Oregon ...
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 ...
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 …
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 ...
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 4. 0 percent zinc. A one-foot sample from the vein in the main tunnel assayed
The pyrite vein and quartz vein samples from the Dapingzhang area were produced from the copper–lead–zinc–sulfur polymetallic sulfide deposit, which is in the town of Dapingzhang, Lantsang area, Pu'er, Yunnan Province. A few pure lump ores from the pyrite veins and quartz veins were used as raw materials and crushed to 0.5–1 mm. Pure …
Veins of gold-bearing quartz that are of low grade but otherwise like the veins here described are common in southwestern Oregon. Most of them are narrow, and although …
HYDROTHERMAL EVOLUTION OF AU-BEARING PYRITE-QUARTZ VEINS AND THEIR ASSOCIATION TO BASE METAL VEINS IN CENTRAL CITY, COLORADO by ... In 1910, 89 mines were in operation, which dropped precipitously to 23 operating mines in 1919 and never reached the same productivity that it once had. While Central City may never
Most of the veins are confined to a belt about 0.25 mile wide that trends approximately N. 10° W., but some prospecting and perhaps a little mining have been done on the Potomac vein and scattered smaller veins west of the main zone. The quartz veins range in width from a few inches to as much as 20 feet.
Characteristics of quartz veins. (a) E-dipping quartz veins (arrows) crosscutting metasedimentary rocks.(b) Extensional veins surrounded by halos of intense albite alteration.(c) Hand specimen of ...
Quartz veins can have a variety of differing structures depending on the environment of formation and the host rock. The most common type of quartz vein is the simple filled vein, which could have a thickness ranging from a small fraction of an inch up to monster veins of quartz with a thickness of 20 to 30 feet and sometimes even more.
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 …
The second period of corundum formation was the Pan-African orogeny (750–450 Ma). This includes primary ruby and sapphire deposits in the gemstone belt of East Africa, Madagascar, India, and Sri Lanka that are linked to collisional processes between eastern and western Gondwana (figure 2) during Pan-African tectonic …
The 56 Favorite Spots To Find And Mine For Quartz In Oregon In 2024. By Keith Jackson - Geologist | Updated January 11, 2024. ... Without further delay, let's start our quest to the quartz-bearing sites in our state! How We Found The Best Quartz Locations in Oregon.
Oregon.gov : State of Oregon
Mining reports will often mention if gold veins occur in the quartz. Another thing worth noting about the quartz is that the kind of quartz that gold is generally found in is not pure white. Most commonly …
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, …
Gold mining deposit report for "Deposit #Usgs10097319 ... Mines. North America. The United States. Oregon. Lake. Deposit #USGS10097319; Quartz Mountain Gold Deposit Bly, Oregon. 42.3217°N 120.7935°W Overview Gold ... OXIDATION IS PRESENT TO DEPTHS OF 165-360 FEET MOST OF THE GOLD IS FOUND IN THE ILLITE …
Quartz veins are common geological features found in a variety of rock types and play an important role in understanding the processes that shape the Earth's. ... Gold-bearing quartz veins, for example, are frequently found in areas associated with hydrothermal activity and can be important targets for gold exploration and mining. Recent.
The obtained results reveal that all the investigated quartz veins samples contain gold, with a usual correlation with Ag, As, Cu, Zn, and Sb. Concentrations of Cu, As, Ag, and Sb, with Au in gold-bearing quartz samples are positively related to the degree of shear deformation (Fig. 16; Table Table5). 5). The geochemical analysis of stream ...
Rock 1 – Quartz Veins. Quartz veins are closely associated with the presence of gold and are visible in rock faces and cliffs in the surrounding area. Weathered chunks of quartz lying on the ground and smaller quartz stones and pebbles in rivers and streams or on their banks are also signs.
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 …
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 late compressional tectonic event and they consist primarily of quartz, tourmaline, carbonates, pyrite, and scheelite. Vein minerals have been deformed and are also cut by ...
Bureau of Mines report on gold mining and milling in the Wickenburg area. About 50% of the gold produced in the area has come from only two mines, the Octave Mine and the Vulture Mine. The Octave Mine, in the southern Weaver Mountains, exploited a …
The presence of gold-bearing quartz veins under the chargeable and resistive anomalies was verified using 2 trenches of 400 m and 20 RC (reverse circulation) drillings with a depth of 60–100 m. ... Mineralogical sitting and distribution of gold in quartz veins and sulfide ores of the Ashanti Mine and other deposits in the Ashanti Belt of ...
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