Wheal Herland, also known as Manor Mine, operated in the western and central sections of the Rosewarne and Herland sett. The mine stretched from northeast of Drannack Mill to south of Gwinear, covering about 1,000 yards. The boundaries between neighboring mines are not clearly defined due to the lack of existing plans. Wheal Herland began operations in 1717 and was intermittently active until 1843. It reached a depth of 120 fathoms and installed a 70-inch Newcombe pumping engine during its early years. The mine was restarted in 1790 as North Herland Mine and later amalgamated with other workings as Rosewarne and Herland United Mines until 1808. It briefly operated again around 1815-1816 before restarting in 1824 until 1843.

The mine was traversed by several lodes, predominantly ENE-trending, including Badger, Bull’s, Colenso’s, Convocation, Manor Old, North Herland, Pleasure, and Wheal Baily lodes. There were also two EW-trending lodes, Fancy Caunter Lode and Herland Caunter Lode, intersecting with other lodes. North Herland Lode was the primary tin-bearing lode, while Manor Old Lode, rich in copper, intersected with Convocation crosscourse, where silver was discovered in 1799. This silver occurrence, along with others in crosscourses like Rusty crosscourse, added to the mine’s production.

Despite incomplete early production records, Wheal Herland is reported to have sold 156 tons of silver ore before 1814. Old Herland Mine produced 677 tons of copper ore in 1794, and between 1816 and 1843, Wheal Herland raised 18,500 tons of copper ore with an average grade of 10.75%.

1710 1726-1762 1792-1808 1815-1816 1824-1860