Trevaunance Mine, situated in the St Agnes area, has a notable history despite limited documentation. At one point, it operated in conjunction with Goonlaze Mine under different names, such as Trevaunance Consols and Trevaunance United. Regarded as an ancient and lucrative mine, it was reputed to have yielded £100,000 in dividends. By 1864, Trevaunance had reached a depth of 60 fathoms (to adit level) and employed twelve workers, with minimal activity below this level. However, by 1870, its workforce had expanded to thirty individuals.

Historical records indicate notable production figures: between 1843 and 1844, Trevaunance Consols sold 1,158 tons of copper ore for £3,625; from 1861 to 1883, Wheal Trevaunance sold 550 tons of black tin; and from 1886 to 1887, it sold 510 tons of black tin.

The site still retains significant features, including the pumping engine stack and the base of the enclosed beam winding engine, both visible from the adjacent public highway within private land. A notable pit, possibly a former open work, lies north of Trevaunance Road, opposite the engine house base, with substantial dumps containing Cassiterite. Despite overgrowth, diligent collectors may still find Cassiterite crystals on joint planes in metamorphosed killas, indicating a stockwork structure.

Trevaunance Mine has been historically renowned for its Fluorite specimens, particularly those displaying a tetrahexahedron crystal habit, colloquially referred to as a ‘four-faced cube.’ While Fluorite can still be found on the dumps, it typically occurs in massive form today. Additionally, careful searching may yield crystalline Topaz specimens.