Epithermal Gold Deposits - Lakehead University

Epithermal Gold Deposits - Lakehead University

Epithermal Gold Deposits (includes quartz-(alunite)-kaolinite and adulariasericite deposits of The Geology of Canadian Ore Deposit Types. These are equivalent to

high-sulfidation and low-sulfidation types in current terminology.)

Plot of Au grade (g/t) versus tonnage (economic, or reserves+production) for selected Canadian epithermal Au deposits and prominent examples elsewhere in the world, classified by subtype as referred to in the text. Canadian epithermal deposits include Al = Al; B = Baker; BD = Blackdome; C = Cinola; DM = Dusty Mac; EQ = Equity Silver; L = Lawyers; LAF = Laforma; N = Mt. Nansen;

SK = Mt. Skukum; SP = Silbak Premier; SUL = Sulphurets; and V = Venus. Hydrothermal vein deposits of a possible transitional or deep epithermal deposits are represented by open circles, sediment-hosted deposits by a green square with cross, and Au-bearing VMS deposits (marine epithermal) by open red squares (see Appendix 1 in Dub et al., 2007). The median grades and tonnages

for several comparable types of deposits (yellow-filled circles) from Cox and Singer (1986) include porphyry Cu-Au [P]; lowsulphidation Creede-type [C]; intermediate sulphidation: polymetallic vein deposits associated with felsic intrusions [M]; and highsulphidation: Summitville deposit [S]; and Lawyers deposit, Toodoggone River district, British Columbia [L; similar to the Comstocktype, Nevada (no symbol) of Cox and Singer, 1986]. Median values for the low-sulphidation Hishikari, Japan vein deposit [ H], and for the high-sulphidation El Indio, Chile, deposit [I] are from Hedenquist et al. (2000). Fields for prominent low-sulphidation (blue shading) and high-sulphidation (dashed line) epithermal Au deposits worldwide (global) are based on data in Hedenquist et al.

(1996; 2000).

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