A small mine operated south of Lifton village on Gatherley farm, which belonged to the Harris family of Hayle estate. Named after the Harris family, the mine, while not economically significant, gained recognition for being the sole source of antimony minerals in the region. It commenced operations in 1850 and revealed three mineral veins at a depth of 10 feet, yielding galena stones containing 60% lead and 52 ounces of silver per ton of ore. Encouraged by this discovery, a shallow adit was constructed, and a shaft was sunk to 27 fathoms, intersecting a robust mineral vein at 13 fathoms. A crosscut at the bottom of the shaft revealed another vein, up to 20 inches wide, containing quartz, pyrite (mundic), patches of copper ore, and galena. Despite the promising start, the mining trial was abandoned within two years. In 1860, a nearby copper vein was reported, supposedly underlying the Wh Harris lead veins. A new company was established, and the old workings were drained, but no copper was found, leading to the eventual abandonment of the mine. Nearly a century later, in 1948, renowned mineralogist Sir Arthur Russell discovered jamesonite, along with pyrite and some sphalerite, alongside galena on a dump near the farmhouse. Additionally, while excavating what was believed to be the old dressing floors, he stumbled upon a small pile of solid jamesonite.