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The former Beldon lead mine and ore works at Beldon Shields is a scheduled monument. The listing says that "The Beldon mine worked a number of small lead veins but the extent of the underground workings are unclear. The visible remains of the lead mine and ore works belong to two separate periods. The first ran from the 18th century, when the mine opened, until its closure by 1820. The mine was enlarged in 1805, when it is thought that a Boulton and Watt steam engine was installed. The mine along with the ore works was worked once again during the 1860s-70s. The remains of the lead mine are visible as a series of earthworks and ruined buildings and structures"; the full listing is at Link (Archive Link ) .
As is often the case, the Bing satellite image Link is much better than that in Google Earth and Where's the Path.