sylvanite

[sil-vuh-nahyt]
noun
a mineral, gold silver telluride, (AuAg)Te 2 , silver-white with metallic luster, often occurring in crystals so arranged as to resemble written characters: an ore of gold.

Origin:
1790–1800; named after Transylvania; see -ite1

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World English Dictionary
sylvanite (ˈsɪlvəˌnaɪt)
 
n
a silver-white mineral consisting of a telluride of gold and silver in the form of elongated striated crystals: a source of gold in Australia and North America. Formula: (Au,Ag)Te2
 
[C18: from (Tran)sylvan(ia) + -ite1, with reference to the region where it was first found]

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Encyclopedia Britannica
Encyclopedia

sylvanite

a gold and silver telluride mineral [(Au,Ag)Te2] in which the ratio of gold to silver atoms is commonly close to 1:1. It is a member of the krennerite group of sulfides and is found associated with them in ore veins formed at low temperatures in Hungary, Australia, Canada, and the western United States. It forms monoclinic crystals. For detailed chemical properties, see sulfide mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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It is not impossible that both calaverite and sylvanite as well as free gold are present.
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