A small mine located just south of Lifton village on Gatherley farm, belonging to the Harris family of Hayle estate and named after them. Although not economically significant, the mine gained recognition for being the only source of antimony minerals in the area. It was established in 1850, revealing three mineral veins at a depth of 10 feet, which yielded galena stones containing 60% lead and 52 ounces of silver per ton of ore. Encouraged by this, a shallow adit was dug 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 initial promise, the trial was abandoned within two years. However, in 1860, a nearby copper vein was reported to underlie the Wh Harris lead veins. A new company was formed, and the old workings were drained, but no copper was found, leading to the eventual abandonment of the mine. Nearly 100 years later, in 1948, noted mineralogist Sir Arthur Russell discovered a quantity of 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 uncovered a small pile of solid jamesonite.