Carlin–type gold deposit

Sedimentary-rock hosted gold deposits in Nevada. All of the deposits shown that are north and east of the Battle Mountain-Eureka trend (and many of the others) are Carlin-type gold deposits. Source: USGS
Goldstrike (Post–Betze) Mine, Carlin Trend, Nevada, the largest Carlin-type deposit in the world, containing more than 35,000,000 ounces gold.[1]
Carlin-type gold ore from the Twin Creeks mine, Nevada, near the Getchell Mine. This is an auriferous, silicified-decalcified siltstone/mudstone from the Comus Formation (Lower Ordovician). Ore grade is about 0.20 to 0.25 ounces of gold per ton of rock. The gold mineralization is very finely disseminated: "invisible gold".

Carlin–type gold deposits are sediment-hosted disseminated gold deposits. These deposits are characterized by invisible (typically microscopic and/or dissolved) gold in pyrite and arsenopyrite. This dissolved kind of gold is called "Invisible Gold", as it can only be found through chemical analysis. The deposit is named after the Carlin mine, the first large deposit of this type discovered in the Carlin Trend, Nevada.

Geology

The Carlin type deposits show enrichment in the elements gold, arsenic, antimony, mercury, thallium and barium. This enrichment is created by hydrothermal circulation with a temperature of up to 300 °C. The underlying rocks out of which the minerals are dissolved are normally silty carbonates, although also silicates and other sediments are possible. The source of the heating for the water in the hydrothermal circulation is still under discussion. The material in the deposit is altered in a way that the carbonate minerals are either dissolved or converted to the silicates by silicate rich hydrothermal water. For example, dolomite is transformed into jasperoid. Another alteration is the formation of clay minerals by interaction of water and feldspar. The absence of base metal sulfides and the even distribution of the pyrite and arsenopyrite in the host rock are the most obvious difference to other sulfide deposits.[2]

Mining

The Carlin–type deposits represent some of the largest hydrothermal gold deposits in the world.[3] The invisible nature of the gold in the deposit makes it difficult to find deposits of that kind. The class of deposit was defined after the Carlin mine became a mass producer of gold in the 1960s and it was recognized that other deposits of that type should exist.[2] Most of the mines in the Great Basin in the United States belong to the Carlin type. Carlin type deposits have also been found in China,[4] Iran,[5][6] and Macedonia.[7]

See also

References

  1. ↑ Fluid evolution and age of Carlin-type gold deposits at USGS
  2. 1 2 Arehart, G. (1996). "Characteristics and origin of sediment-hosted disseminated gold deposits: a review" (PDF). Ore Geology Reviews. 11 (6): 383–403. doi:10.1016/S0169-1368(96)00010-8. Archived from the original (PDF) on 2010-12-14.
  3. ↑ Kesler, Stephen E.; Riciputi, Lee C.; Ye, Zaojun (2005). "Evidence for a magmatic origin for Carlin-type gold deposits: isotopic composition of sulfur in the Betze–Post–Screamer Deposit, Nevada, USA". Mineralium Deposita. 40 (2): 127–136. Bibcode:2005MinDe..40..127K. doi:10.1007/s00126-005-0477-9.
  4. ↑ Rui-Zhong, Hu; Wen-Chao, Su; Xian-Wu, Bi; Guang-Zhi, Tu; Hofstra, Albert (2002). "Geology and geochemistry of Carlin-type gold deposits in China". Mineralium Deposita. 37 (3–4): 378–392. Bibcode:2002MinDe..37..378R. doi:10.1007/s00126-001-0242-7.
  5. ↑ Asadi, H.H.; Voncken, J.H.L.; Hale, M (1999). "Invisible Gold at Zarshuran, Iran". Economic Geology. 94: 1367–1374. doi:10.2113/gsecongeo.94.8.1367.
  6. ↑ Asadi, H.H.; Voncken, J.H.L.; Kühnel, R.A.; Hale, M. (2000). "Petrography, Mineralogy and Geochemistry of the Zarshuran Carlin-like Gold Deposit, northwest Iran". Mineralium Deposita. 35 (7): 656–671. doi:10.1007/s001260050269.
  7. ↑ Volkov, A. V.; Serafimovski, T.; Kochneva, N. T.; Tomson, I. N.; Tasev, G. (2006). "The Alshar epithermal Au-As-Sb-Tl deposit, southern Macedonia". Geology of Ore Deposits. 48 (3): 175–192. Bibcode:2006GeoOD..48..175V. doi:10.1134/S1075701506030020.
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