Actually some Pyrite contains Gold (as in that in our Krong Pile) and all Pyrite contains Sulfur and when the Sulfur is removed the Gold is left behind.
A little research would go a long way.
After removing the Sulfur the Gold content of the ash is of course higher (more concentrated) than in the original product.
Pyrite
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"Fool's Gold" redirects here. For other uses, see Fool's Gold (disambiguation).
Pyrite
A mass of intergrown, striated pyrite crystals
General
Category Sulfide mineral
Chemical formula iron disulfide (FeS2)
Identification
Color Pale brass yellow, dull gold
Crystal habit Cubic, faces may be striated, but also frequently octahedral and pyritohedron. Often inter-grown, massive, radiated, granular, globular and stalactitic.
Crystal system Isometric; bar 3 2/m
Twinning Penetration twinning
Cleavage Poor
Fracture Very uneven, sometimes conchoidal
Mohs Scale hardness 6–6.8
Luster Metallic, glistening
Refractive index Opaque
Streak Greenish-black to brownish-black; smells of sulfur
Specific gravity 4.95–5.10
Fusibility 2.5–3 to a magnetic globule
Solubility insoluble in water
Other Characteristics paramagnetic
References [1][2][3]
The mineral pyrite, or iron pyrite, is an iron sulfide with the formula FeS2. This mineral's metallic luster and pale-to-normal, brass-yellow hue have earned it the nickname fool's gold due to its resemblance to gold. Pyrite is the most common of the sulfide minerals. The name pyrite is derived from the Greek πυρίτης (puritēs), “of fire” or "in fire”, from πύρ (pur), “fire”. This name is likely due to the sparks that result when pyrite is struck against steel or flint. This property made pyrite popular for use in early firearms such as the wheellock.
Pyrite is usually found associated with other sulfides or oxides in quartz veins, sedimentary rock, and metamorphic rock, as well as in coal beds, and as a replacement mineral in fossils. Despite being nicknamed fool's gold, small quantities of gold are sometimes found associated with pyrite. Gold and arsenic occur as a coupled substitution in the pyrite structure. In the Carlin, Nevada gold deposit, arsenian pyrite contains up to 0.37 wt% gold.[4] Auriferous pyrite is a valuable ore of gold.
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