Oregon Mines
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 ...
Gold in Quartz
February 2016 by Chris Ralph. Most prospectors, when they think of hard rock gold deposits, think of quartz containing particles of gold. While gold deposits can be things besides quartz veins, gold is certainly found in the quartz of veins cutting through various types of rocks. Gold in quartz veins occurs as particles and scales scattered ...
Geology of Corundum and Emerald Gem Deposits | Gems
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 …
National mineral assessment tract PC40
Gold-bearing mesothermal quartz veins are localized along major deep-seated through-going structural features in low- to moderate-grade marine metasedimentary and metavolcanic rocks. Many of the type examples used by Berger (1986) in the low-sulfide Au-quartz descriptive model are in the Pacific Coast region.
Gold Mines in Oregon | American Bullion
This process has led to the formation of gold-bearing quartz veins, which are mined in areas like the Bohemia Mining District. Historical Gold Discoveries: Oregon's gold richness was first realized during the mid-1800s when prospectors discovered gold in rivers and streams, leading to minor gold rushes.
Orogenic gold in the Blue Mountains, eastern Oregon, USA
Introduction. 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 late 1800's and early 1900's. The belt is loosely defined as the region bounded by the 45°N, ∼44.25°S, ∼117°W, and ∼ 119°W ( Fig. 1, Fig. 2 ).
How to Find Gold in Quartz | Sciencing
Gold is easy to spot in white quartz. Use your geology hammer and sledge to break open quartz and potential gold-bearing rocks. Place an iron or steel anvil in a large flat pan to prevent loss of rock powder and contained gold. Look for large pieces of gold that you can collect manually or with tweezers. Sieve and pan the smallest fractions of ...
Mineralogical and Geochemical Characterization of Gold Bearing Quartz
Epigenetic, N-S, NNE-SSW quartz veins crosscut metapelites and metagabbro in Maru area. The objectives of this work were to study field, mineralogy, and geochemical characteristics of gold bearing quartz veins and soils. Euhedral and polygonal magnetite with hematite constituted the major ore minerals. Quartz occurred as main …
Mine Tales: Gold plentiful — at first — at Yavapai County's Rich Hill
Between 1863 and 1899 Rich Hill and nearby placer discoveries along Weaver and Antelope creeks is credited with $3 million in gold production from gold bearing veins below the surface detrital ...
The geochemistry, origin, and hydrothermal alteration mapping
According to Ref. 62, there are two stages of quartz veining: milky, massive, and fine-grained quartz and gray, euhedral, coarse-grained quartz veins. In the Hamash mine, the mineralized quartz ...
292 GOLD AND SILVER IN OREGON
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, …
PROCEEDINGS OF THE SYMPOSIUM ON MINERAL …
gold-bearing quartz veins of the Alleghany district, California (abs.), 25 ... copper-gold mineralization at the Iron Dyke mine, Oregon, 21 Juhas, A. P., and Gallagher, T. P., Kuroko type mineralization at the Red Ledge deposit, Idaho, 20 Koski, R. A., Volcanogenic massive sulfide deposits in ocean-crust
THE ORIGIN OF GOLD-BEARING QUARTZ VEINS IN …
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. ... tion of the origin of the gold-bearing quartz veins. Past production of the mines in the area, and a summary of early investigations and the ...
Millrock Enters Into Exploration Agreement Concerning Apex
The Apex project targets high-grade, mesothermal, gold-bearing quartz vein deposits. The claims cover the former-producing Apex and El Nido gold mines which operated intermittently from the 1920s ...
Progressive crushing 40Ar/39Ar dating of a gold-bearing quartz vein
Since the pyritized gold-bearing quartz vein in Liaotun is related to the main-metallogenic stage and its gold grade is as high as ca. 4 g/t Au, the age of PFIs determined in this study can be ...
Bonanza Mine (MRDS #10310593) AU
Mother Lode Belt mineralization is characterized by steeply dipping gold-bearing quartz veins and bodies of mineralized country rock adjacent to veins. Mother Lode veins are characteristically enclosed in Mariposa Formation slate with associated greenstone. The Mother Lode belt vein system ranges from a few hundred feet to a mile or more in width.
STATE OREGON DEPARTMENT GEOlOGY AND MINERAl …
The 100 known veins within the district have open-space fillings of quartz, complex sulfides, and other minerals. Associated with the vein ing is hydrothermal alteration of the country …
Yuma County Arizona Gold Production – Western Mining History
Organized in 1863, the Castle Dome district has produced about equal amounts of placer and lode gold. The first discoveries were of silver-bearing lead ore; gold placers were found in 1884, and gold-quartz veins, although known for some time, received little attention until 1912 (Wilson, 1933, p. 85, 87; 1952, p. 23).
Vein deposits » Geology Science
Mining of Vein Deposits. Vein deposits can be mined using underground mining techniques, such as drift and fill, cut-and-fill, and room and pillar mining. ... Located in California, USA, the Mother Lode Gold Belt is a 120-mile-long zone of gold-bearing quartz veins. It has been a significant source of gold in the region since the 1850s, and …
The Jillson Mine Uncovers a Rich Vein of Gold
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.
Gold Mining in Southern Oregon
In the milling tests the concentrates gave $157 gold and 900 ounces silver per ton. The silver in the gold reduces the bullion value to $13 to $14. The Ashland's gold is worth about $15.50, due to the presence of silver, or …
Oregon Department of Geology and Mineral Industries
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 …
A collection of articles dating from the 1800s to the present;
Dr. C. T. Jackson read an account of a new mine ofGold 1 Silver, Lc'ad, and Copper, recently opened at Bridgewater, Vermont. The minerals at present known in this mine are as follows, viz. Native gold in scales, and small irregular grains, in quartz, in black blcndc, and in other minerals of the vein; Argentifcrous
292 GOLD AND SILVER IN OREGON
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
INITIAL INVESTIGATION OF SAMPLES OF THE VIRTUE MINE, …
Request PDF | On Jan 1, 2020, Carter Lindeman and others published INITIAL INVESTIGATION OF SAMPLES OF THE VIRTUE MINE, OREGON: A STUDY INTO …
Gold Mines in Oregon | American Bullion
The movement of tectonic plates and geological uplift has raised these former seabed areas, bringing gold-rich sediments to the surface. This process has led to …
Oregon Gold Production Summary – Western Mining …
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 …
Where Was The Most Gold Found In The United States?
After the war a number of mines were opened on gold-bearing quartz veins in Montgomery County. No gold production has been reported since 1951. ... Travellers along the Oregon Trail bound for the Willamette Valley are said to have discovered gold in northeastern Oregon in 1845, but mining in earnest did not begin until 1861. …
9.3.1: Magmatic Ore Deposits
9.3.1: Magmatic Ore Deposits. Figure 9.75: Gold-bearing quartz vein at the Nalunaq Gold Mine in Southern Greenland. Meter stick for scale. Minerals containing elements of economic value are generally present in all igneous rocks, but the elements may not be concentrated enough to make mining economical.