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.25 ounce-per-ton gold ore occurred in the mid-1930s. The funter bay underground lode mine produced about 500 thousand tonnes of copper-nickel-cobalt ore, without gold, thank from a mesozoic gabbro-norite pipe. No significant placer mining was done on Admiralty. About 500,000 ounces of gold, almost all from the currently operating Greens Creek lode silver mine, have been recovered from the Admiralty district. Chichagof district edit Alaska mining District Approximately 800,000 ounces of gold have come from the Chichagof district. Chichagof, yakobi, baranof and smaller islands comprise the district. 13 Numerous lode and placer prospects and mines exist in the district.
To the west is the pacific Ocean and the Chichagof District lies to the south. The discovery Channel series Gold Rush Alaska takes place in this region. Juneau district edit main article: Juneau mining district In 1880 a local inhabitant, Chief Kowee, revealed to prospectors joe juneau and Richard Harris the presence of gold in what is now named Gold Creek in Silver Bow Basin. The city of Juneau was founded there that year. The strike sparked the juneau gold rush which resulted in the development of many placer and lode mines including the largest, in their time, gold mines in the world: the Treadwell complex of lode mines on douglas Island (across a narrow sea channel from Juneau). Over 7 million ounces of lode gold and 80,000 troy ounces (5,500 lb; 2,500 kg) of placer gold have been recovered from the juneau district. Admiralty district edit main article: Admiralty mining district Most of the gold recovered from the Admiralty mining district (which consists of Admiralty Island) is a by product of silver and base way metal mining.
All of these operations are seasonal, none employ more than a few dozen people. Many are family operations with roots reaching back several generations. The 2015 estimate of 120 full-time-equivalent jobs attributed to placer gold mining as reported by the mine safety and health Administration is underreported and is considered a minimum estimate. 4 Historical lode and placer gold mines edit southeast Alaska edit porcupine district edit over 81,000 troy ounces (5,600 lb; 2,500 kg) of placer gold came from the porcupine district near haines. Porcupine Creek, about 20 miles (32 km) north of haines, is the site of an 1898 gold discovery; the creek has been intermittently placer mined ever since. Outside of the porcupine basin only a few other creeks Glacier, nugget and Cottonwood produced significant gold. The area around reid Inlet, in modern Glacier bay national Park and Preserve, hosted several hard rock gold prospects, including the leroy mine, which exploited quartz veins for about 10,000 ounces of gold production. The district, which includes skagway and haines, is bordered to the north and east by canada.
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The mine, after decades of motivation inactivity, returned to production for several years in the mid-1990s, and again in 20, when a significant variation between actual and predicted headgrades occurred. An updated resource evaluation is pending further work. The niblack prospect, a zinc - copper - silver - gold vms deposit on southeastern Prince of Wales Island, in the ketchikan Mining District. Ore occurs as massive sulfide bodies hosted in a local rhyolite belt within a package of deeply deformed and metamorphosed volcanic and sedimentary rocks. In the last ten years, significant underground and surface exploration occurred at this early-1900s minesite.
A recent retriever estimate reports a near surface indicated resource of 4073 kg of gold, 59,424 kg of silver, 14,810 metric tons of copper, and 30,474 metric tons of zinc contained in 1,424,000 metric tons of ore; and deeper inferred resources of 3,919 kg of gold, 55,295 kg of silver. 12 Further exploration is planned. Many significant exploration efforts for gold, across the state, contributed to the total of over 310 million spent on mineral exploration in Alaska in 2007. Placer mining edit Placer mining continues throughout Alaska. Placer mine production during the 5 years to 2014 has averaged 74,360 ounces of gold or 8 percent of the total gold produced in Alaska annually.
4 Advanced gold-bearing hard rock exploration projects of note edit The donlin Gold project, in the kuskokwim Gold Belt, contains a proven and Probable reserve.8 million ounces at a grade.09 g/t (using a gold price of US975/oz within a measured and. 7 Donlin is one of the largest known undeveloped gold deposits in the world. If developed according to plans published in spring 2009 it will be one of the largest gold mines in the world. 8 A large and robust series of felsic sills and dikes hosts the gold in association with small-scale quartz (and lesser quartz and/or carbonate) veinlets. The sills intrude a thick sequence (5000 feet) of non-metamorphosed, folded, graywacke, sandstone, and shale.
The deposit occurs on private land owned by native corporations Calista corporation and The kuskokwim Corp. Donlin Creek llc, equally owned by barrick gold and novagold Resources, holds a lease on the land and operates the project. Donlin Gold is expected to be a conventional open pit, truck-and-shovel operation. Production is expected to occur over 27 years. 9 Pebble copper, discovered in the mid-1980s, is one of the largest known copper-gold porphyry deposits in the world. It is located on State of Alaska-owned land. The deposit contains measuredindicatedinferred resources of 72-billion pounds of copper, 94-million ounces of gold, and.8-billion pounds of molybdenum, within.1 billion tonnes of ore. 10 11 Nixon Fork mine in the McGrath Mining District. First exploited in 1907, this underground operation exploits high-grade gold skarn ore bodies along contacts between Cretaceous granitoid and metamorphosed Paleozoic sediments.
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The december 2015 Proven and Probable reserve was.8 million tons of ore.198 ounces of gold per ton (6.16 g/t) with 560,000 troy ounces (17,000 kg) of contained gold out of a total identified resource, inclusive of the Proven and Probable reserve,.7. There were 332 full-time-equivalent employees at Kensington at the end of 2015. 4 The Greens Creek mine is a silver-lead-zinc mine owned and operated writing by hecla mining, located on private and federal land in the Admiralty mining district, 18 miles (29 km) southwest of Juneau. The Greens Creek deposit is a polymetallic, stratiform, volcanogenic massive-sulfide deposit that opened in 1989. In 2015, Greens Creek produced 60,566 troy ounces (1,883.8 kg) of gold. The mine also produced 8,452,153 troy ounces (262,891.3 kg) of silver, 61,934 tons of zinc and 21,617 tons of lead. As of December 31, 2015, hecla reported a proven and Probable reserve.2 million tons of ore.3 ounces of silver per ton,.80 g/t (0.09 oz/t) of gold,.0 percent lead, and.1 percent zinc, sufficient for a remaining mine life. The total identified resource, including proven and probable reserves,.7 million tons.3 ounces of silver per ton,.09 ounce of gold per ton,.9 percent lead, and.6 percent zinc, containing nearly 143 million ounces of silver. There were 418 full-time-equivalent employees in 2015.
Total 2015 employment at Fort Knox was 657 full-time-equivalent positions. 4 The pogo underground gold mine is owned and operated by sumitomo metal Mining and Sumitomo corp., on State of Alaska-owned land 38 mi (61 km) northeast of Delta junction in the goodpaster real district. In 2015 it produced 283,000 troy ounces (8,800 kg) of gold from stacked, shallow-dipping quartz veins up to 65 ft thick (20 m). Pogo had 350 full-time-equivalent employees on site in 2015. 4 The kensington underground gold mine, owned by coeur Mining, is located 45 air miles north of Juneau and 35 air miles (56 km) south of haines, located in the berners bay mining district. Access to the mine is by air or sea. The ore deposit consists of multiple mesothermal quartz, carbonate, and pyrite vein swarms and discrete quartzpyrite veins hosted in Cretaceous diorite. Ore is processed in a flotation mill that produces a gold-bearing concentrate. In 2015 128,865 troy ounces (4,008.1 kg) of gold were produced from 21,829 tons of concentrate that were shipped to an off-site refinery.
or development projects. Lode (hard rock) mines edit, the, fort Knox mine is located within the, fairbanks North Star Borough, 25 miles (40 km) northeast of fairbanks. The mine site is located primarily on State of Alaska and the. Mental health Trust lands. The mine is a wholly owned. The mine opened in 19 produced 401,553 troy ounces (27,535.1 lb; 12,489.7 kg) of gold. Fort Knox is an open-pit operation using carbon-in-pulp, heap leach, and gravity processes to recover gold. At the end of 2015 there were reserves of 162.4 million tons.012 ounce of gold per ton (0.37 g/t sufficient to carry the mine plan into year 2020, within a total identified resource of 284.4 million tons.013 ounce per ton (0.40.
Nearly all of the large and many of the small placer gold mines currently operating in the us are in Alaska. 2, six mom modern large-scale hard rock mines operate in Alaska in 2008; four of those are gold-producing mines (an additional gold mine suspended production in late 2007). There are also some small-scale hard rock gold-mining operations. Alaska currently produces more gold (in 2015: 873,984 troy oz from hard rock mines, and 74,360 troy oz (five-year average) from placer deposits) than any state except. 3, in 2015, gold worth.01 billion accounted for 37 of the mining wealth produced in Alaska. Zinc and lead, mainly from the. Red Dog mine, accounted for 53; silver, mainly from the Greens Creek mine, accounted for.5; and coal accounted for.5.
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Gold mining in Alaska, a state of the, united States, has been a major industry and impetus for exploration and settlement since a few years after the United States acquired the territory from Russia. Russian explorers discovered placer gold in the. Kenai river in 1848, but no gold was produced. Gold mining started in 1870 from placers southeast of Juneau, alaska. 1, gold is found and has been mined throughout Alaska; except in the vast swamps of the yukon Flats, and along the. North Slope between mba the, brooks Range and the, beaufort sea. Areas near, fairbanks and Juneau, and. Nome are responsible for most of Alaska's historical and all current gold production.