Magnetic lows associated with these intersections are interesting since the injection of sulphides by gold-bearing fluids often converts magnetite, a magnetic oxide mineral, to pyrite, a non-magnetic sulphide mineral, resulting in patches of low magnetic intensity.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, pyrite is sometimes found in association with small quantities of gold. Gold and arsenic occur as a coupled substitution in the pyrite structure..Traps7