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Introduction and Deposit Description CARLIN-TYPE deposits comprise extremely fine-grained dis-
 

Summary: Introduction and Deposit Description
CARLIN-TYPE deposits comprise extremely fine-grained dis-
seminations of Au hosted by altered silty carbonate rocks. The
majority of these deposits for which there are more than de-
scriptive data available are located in the Great Basin of west-
ern North America (Fig. 1). The characteristics of many of
these deposits are described in a series of papers in U.S. Geo-
logical Survey Bulletin 1646 (Tooker, 1985), by Arehart
(1996), and by Hofstra and Cline (2000). However, additional
deposits that may be Carlin-type deposits are known from lo-
cations as diverse as southern China (Ashley et al., 1991; Mao,
1991), southeastern Asia (Sillitoe and Bonham, 1990; Garwin
et al., 1995; Talusani, 2001), Iran (Mehrabi et al., 1999; Asadi
et al., 1999), Africa (Hill, 1997), and Peru (Alvarez-A. and
Noble, 1988).
Most Carlin-type deposits are characterized by high Au
and/or Ag, by a geochemical association of Au, As, Sb, Hg,
and locally Tl and Ba, and by a notable absence of base metal
sulfide minerals. The most conspicuous alteration features
are highly silicified zones, commonly known as jasperoids,

  

Source: Arehart, Greg B. - Department of Geological Sciences, Mackay School of Mines, University of Nevada, Reno

 

Collections: Geosciences