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The Willow Creek mining district, also known as the Independence Mine/Hatcher Pass district, is a gold-mining area in the U.S. state of Alaska. Underground hard-rock mining of gold from quartz veins accounts for most of the mineral wealth extracted from the Hatcher Pass area. The first mining efforts were placer mining of stream gravels, and ...
The quartz ledge at the Crystal Mine was first discovered in 1895 by B. Heins. It was so named because of the large pyrite cubes which were found occurring in the surface outcrops of the ledge. Gold was extracted till 1905 from quartz using ten-stamp mill and from about 1,000 feet of underground workings yielded 1,210 ounces of gold .
Most of the gold recovered from the Admiralty mining district (which consists of Admiralty Island) is a by product of silver and base metal mining. The Alaska Empire underground lode mine recovered gold from quartz veins in metamorphic rocks. Discovered and staked in the 1920s, production of about 20,000 tonnes of 0.25 ounce-per-ton gold ore ...
Treadwall Mining. The Juneau gold belt is located in the southeastern portion of the U.S. state of Alaska.This belt is approximately 100 miles (160 km) in length, north/northwest-trending, [1] and extends from Berners Bay southeastward to Windham Bay, 60 miles (97 km) southeast of Juneau, and includes Douglas Island.
In situ gold-bearing vein (in brown) at the Toi gold mine, Japan. In many gold mines exploited during the gold rushes of the 19th century, vein material alone was typically sought as ore material. [8] In most of today's mines, ore material is primarily composed of the veins and some component of the wall rocks which surrounds the veins. [9]
Copper-bearing quartz veins occur in greenstone schist along a narrow belt stretching four miles NNE-SSW from Keysville on the north to Virgilina on the North Carolina border. The Barnes mine is reported to have produced some copper in the early 18th century, but the major productive era for the district was the late 19th century to 1917. [68]
Gold mining in Egypt involved both surface mining such as panning for gold in riverbeads and underground mining, where tunnels were dug to extract gold-bearing quartz veins. [6] During the Bronze Age, sites in the Eastern Desert became a great source of gold-mining for nomadic Nubians, who used "two-hand-mallets" and "grinding ore extraction."
A molybdenite deposit occurs on The Nunatak in quartz veins associated with a quartz monzonite porphyry, [9] [10] which includes gold at 0.04 ounces per ton, and silver at 7.07 ounces per ton. A copper deposit occurs on Observation Mountain. Quartz veins containing gold are exposed west of Dundas Bay and on Gilbert Island. Placer gold is also ...