Introduction: gudmundite can occur in a wide variety of hydrothermal ore deposits in association with other sulpharsenides and sulphantimonides, but is usually only an accessory or minor member of any given assemblage.

Occurrence in Wales: in 1988, Rust & Mason reported, in describing the primary mineral paragenesis at Esgairhir Mine in Central Wales, the presence of laths and prismatic crystals of a mineral with the optical properties of gudmundite, overgrowing 'linnaeite' and millerite. Subsequent analytical work, however, correctly identified this mineral to be tucekite (Mason, 1998): therefore gudmundite and references to it at Esgairhir Mine should be amended appropriately.

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