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Abstract

Cobalt is one of the least familiar metals and with a crustal abundance of only 25 ppm it is also one of the rarest. With the exception of the Bou Azzer mine current production is entirely a secondary product of copper and nickel mining. Thirty-four cobalt minerals have been recognized—principally sulphides, selenides, arsenides, sulpharsenides, carbonates, sulphates and arsenates. The main ore minerals of cobalt are the sulphides cobaltite, linnaeite and carrollite and the hydrated oxide asbolane. Cobaltiferous pyrite is a further source.

Workable deposits generally contain 0.1-0.4% Co and belong to one of four geologically distinct types: (1) sediment-hosted—largely Precambrian—typified by the copperbelts of Congo Democratic Republic and Zambia, which since the 1970s have contributed between 25 and 50% of the world's mine production; (2) mid-Tertiary to Recent nickel-rich lateritic deposits generated by tropical and subtropical weathering of peridotitic rocks, most notably in New Caledonia, Cuba and Australia; (3) primary magmatic Ni-Cu sulphide concentrations, such as Sudbury, Noril'sk, Voisey's Bay and Bushveld; and (4) a more diverse group attributable to hydrothermal and volcanogenic processes, the most important of which in terms of current and future production are the ophiolite-hosted Co-As deposit at Bou Azzer, Morocco, and the epigenetic Cu-Au-Co concentrations of the Idaho Cobalt Belt, U.S.A. The last group also includes the formerly important Outokumpu-type massive sulphide and five-element (Ni-Co-Ag-As-Bi), vein-type deposits.

The currently quoted figure for global cobalt reserves of 4 500 000 t may be overstated since it does not take into account the effects of political uncertainty in the Congo Democratic Republic. However, even at proposed increased levels of production (70 000 t /year, against the current figure of 28 300 t/year) reserves have a life of at least 60 years. Some potential exists in the longer term for cobalt extraction from offshore reserves of manganese nodules.

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References

Burger

P. A.

The Bulong Western Australia, Ni/Co deposits: a case history. In Grimsey

E. J.

. eds Nickel ‘96: mineral to market. Papers from a conference held in Kalgoorlie, Western Australia, 27–29 November, 1996 (Carlton, Vic.: Australasian Institute of Mining and Metallurgy, 1998), 37–41. Publication series 6/96

Cronan

D. S.

. An evaluation of manganese nodules and cobalt-rich crusts in South Pacific exclusive economic zones—nod-ules and crusts in and adjacent to the EEZ of the Cook Islands (the Aitutaki--Jarvis transect). Marine Mining, N.Y., 10, 1–28.

Fazakerley

V. W.

and Murin

Monti R.

Murrin nickel-cobalt deposits. In Berkman

D. A.

and Mackenzie

D. H.

eds Geology of Australian and Papua New Guinean mineral deposits. Aus.IMM Monograph Series 22, 1998, 329–34.

Foster

J. G.

. Re—Os isotopic evidence for genesis of Archaean ores from uncontaminated komatiites. Nature, Lond., 382, 1996, 703–6.

Gaal

and Early

Parkkinen J.

Proterozoic ophiolite-hosted copper-zinc-cobalt deposits of the Outokumpu type. In Kirkham

R. V.

. eds Mineral deposit modelling. Spec. Pap. geol. Ass. Can., 40, 1993, 335–41.

Garlick

W. G.

The synsedimentary theory. In Mendelssohn

ed. The geology of the Northern Rhodesian copper belt (London: Macdonald, 1961), 146–65.

Goad

R. E.

. NICO and Sue-Dianne Proterozoic iron oxide-hosted polymetallic deposits, southern Great Bear magmatic zone, Northwest Territories, Canada: application of the Olympic Dam model. Paper presented at Montreal ‘98, 100th Annual General Meeting of CIM, 1998.

Guilbert

J. M.

and Park

C. F.

The geology of ore deposits (New York: W. H. Freeman, 1986).

Halbach

P. E.

. Cobalt-rich and platinum-bearing man-ganese crust deposits on seamounts: nature, formation and metal potential. Marine Mining, N.Y., 8, 1989, 23–39.

10.

Hellsten

, Lewis

C. R.

and Dens

Cawse nickel-cobalt deposit. Reference 3, 335–8.

11.

Hodgson

G. D.

Greenmount copper—cobalt—gold deposit. Reference 3, 769–74.

12.

Kissin

S. A.

Five-element (Ni—Co—As—Ag—Bi) veins.

Geosci. Can., 19, 1992, 113–24.

13.

Kremarov

R. L.

and Stewart

J. I.

Geology and mineralization of the Greenmount Cu—Au—Co deposit, southeastern Marimo basin, Queensland.

Aus. J. earth Sci., 45, 1998, 463–82.

14.

Lavaut

C. W.

Geological weathering tendencies of ultramafic rocks in eastern Cuba.

Mineria Geol., 15, 1998, 9–16.

15.

Leblanc

and Billaud

Cobalt arsenide orebodies related to an Upper Proterozoic ophiolite: Bou Azzar (Morocco).

Econ. GeoL, 77, 1982, 165–75.

16.

Lenoble

J. P.

Polymetallic nodules of the deep sea: 30 years of activities around the world.

Chron. Rech. Miniere, 524, 1996, 15–39.

17.

Lesher

C. M.

and Campbell

I. H.

Geochemical and fluid dynamic modelling of compositional variations in Archean komatiite-hosted nickel sulphide ores in Western Australia.

Econ. GeoL, 88, 1993, 804–16.

18.

and Naldrett

A. J.

The Voisey's Bay Ni—Cu—Co deposit, Labrador, Canada: variations of olivine composition related to multi-ple magma injections and sulphide segregation. In Papunen H. ed. Mineral deposits: research and exploration—where do they meet? Proc.

fourth biennial SGA meeting, Turku, Finland (Rotterdam: Balkema, 1997), 461–2.

19.

Lightfoot

P. C.

The giant nickel deposits at Sudbury and Noril'sk.

Paper presented at Nickel in a nutshell, 64th Annual con-vention and trade show of the Prospectors and Developers Association of Canada, 1996.

20.

Lightfoot

P. C.

. Geochemical relationships in the Sudbury Igneous Complex: origin of the main mass and offset dykes. Econ. GeoL, 92, 1997, 289–307.

21.

Maacha

, Azzizi

and Bouchta

Cobalt deposits of the Bou Azzer district (Anti-Atlas): structure, mineralogy and formation conditions.

Chron. Rech. Miniere, 531–2, 1998, 65–75.

22.

Mitchell

A. H. G.

and Garson

M. S.

Mineral deposits and global tectonic settings (London: Academic Press, 1981).

23.

Naldrett

A. J.

Key factors in the genesis of the Noril'sk, Sudbury, Inhaul, Voisey's Bay and other world-class Ni—Cu—PGE deposits: implications for exploration.

Aus. J. earth Sci., 44, 1997, 283–315.

24.

Naldrett

A. J.

World-class Ni—Cu—PGE deposits: key factors in their genesis.

Mineral. Deposita, 34, 1999, 227–40.

25.

Naldrett

A. J.

. Geology of the Voisey's Bay Ni—Cu—Co deposit, Labrador, Canada. Explor. Min. Geol., 5, 1996, 169–79.

26.

Nash

J. T.

and Hahn

G. A.

Stratabound Co—Cu deposits and mafic volcaniclastic rocks in the Blackbird mining district, Lemhi County, Idaho. In Boyle

R. W.

. eds Sediment-hosted stratifonn copper deposits (St. Johns, Newfoundland: Geological Association of Canada, 1989), 339–56.

27.

Nold

J. L.

The Idaho cobalt belt, northwestern United States—a metamorphosed Proterozoic exhalative ore district. Mineral. Deposita, 25, 1990, 163–8.

28.

Osborne

R. C.

Nickel laterites—existing operations and new developments. Reference 19.

29.

Pankka

H. S.

Epigenetic Au—Co—U deposits in an early Proterozoic continental rift in the northern Fennoscandian Shield: a new class of ore deposit. Reference 18, 277–80.

30.

Pye

E. G.

, Naldrett

A. J.

and Giblin

P. E.

The geology and ore deposits of the Sudbury structure. Spec. Vol. Ont. geol. Surv. 1, 1984.

31.

Stone

W. E.

and Masterman

E. E.

Kambalda nickel deposits. Reference 3, 347–56.

32.

Sweeney

M. A.

, Binda

P. L.

and Vaughan

D. J.

Genesis of the ores of the Zambian Copperbelt.

Ore Geol. Rev., 6, 1991, 51–76.

33.

United States Geological Survey. Mineral commodity summaries 2000. U.S. Department of the Interior, U.S. Geological Survey, 2000.

34.

Wallis

D. S.

Nickel and cobalt: Queensland mineral commod-ity report.

Queensland Government Mining J., August 1994, 28–36.

35.

Wang

and Qin

The extremely basic member of VAMSD deposit series: the Deerni large copper—cobalt deposit of Qinghai province, its geological characteristics and genetic type. Mineral. Deposits, 16, 1997, 1–10.

36.

Wedepohl

K. H.

Handbook of geochemistry, vol. 2 (Berlin: Springer-Verlag, 1974), Part 3, Chapter 27.

37.

Whitney

J. A.

and Naldrett

A. J.

eds. Ore deposition associated with magmas (Chelsea, MI: Society of Economic Geologists, 1989). Rev. econ. Geol. 4

Always the bridesmaid,never the bride: Cobalt geology and resources

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