Plymouth: grid reference SX551594

Notable minerals: Cassiterite.

This tin and arsenic mine was situated northeast of Plymouth about one and a half miles northwest of Hemerdon and Plympton. It worked three E-W trending lodes called Julien's (North) Lode, Middle (Main) Lode and South Lode from Julien's Shaft, Engine Shaft and William's Shaft.

'Sidney Mine is in the parishes of Plympton St. Mary and Shaugh Prior, Devon, and mining district of Plympton; it is situated 7 miles from the town of Plymouth, which is the nearest shipping place for ores and machinery. The nearest railway station is at Plympton, 2 miles from the mine. The mine is held under a lease for 21 years, from 1850, at a royalty of 1-18th, granted by George Strode, Esq., of Newnham. The country is slate, and the dip north. The nearest granite is at Dartmoor, 1 mile distant. There has been one shaft sunk 45 fathoms. The mine is worked and drained by water-power, a wheel 44 feet diameter, 4 feet wide. The minerals bound in this sett include tin and a little copper. This mine was first opened in 1850, but was worked, it is supposed, over 300 years since. This mine is now worked for tin. The produce in 1852 was £1,095 1 s. 6d.; in 1853, £3,261 16s. 6d.; in 1854, £1,930 11s. 6d.; and to October 1855, £2,170 4s. 2d. The company is on the costbook system, and consists of 1,024 shares, with 12s. 6d. paid, representing a capital of £8,832. The purser is H. E. Croker, of Plymouth; the captain is W. Edwards, Colebrook, Plympton.'

Output is reported as 100 tons of black tin between 1852 and 1854; 412 tons of black tin, 11 tons of arsenic and 147 tons of mispickel (arsenopyrite) between 1854 and 1864.