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Coldberry Lead Mine

The monument includes the ruins, earthworks and other remains of the Coldberry lead mine and Red Grooves Hushes and ore works. The monument lies between the Hudeshope and Bow Lee becks, 3km NNW of the village of Middleton in Teesdale. The early history of the lead workings at Coldberry is uncertain though more than two million tons of material had been removed from the hush prior to the mid-18th century. The mines were later worked by an extensive network of levels and dressing floors were built on artificial terraces in the 19th century. The mine declined thereafter though an oreshoot was worked between the late 1930s and 1953. The Coldberry Gutter hush, situated on the watershed between the Hudeshope and Bow Lee becks and running through Hardberry Hill, measures 1.7m long and is up to 50m wide by 30m deep. At the east end of the hush stand the remains of the largely mid-19th century Coldberry Mine built by the London Lead Company. The mine includes a two-storey mine lodging shop measuring 22m by 10m, a table and smithy block measuring 8m by 14m, a 2m high level arch and retaining wall and a roofed powder store, approximately 5m square, situated to the north west of the main complex. All are Grade II Listed Buildings. All three buildings are roughly coursed and appear to be of contemporary build. A number of 20th century buildings, of red brick and concrete construction, are visible to the east and retain a number of machine settings. The dressing floors situated to the south east have been landscaped following the removal of the waste tips for reprocessing, though extensive deposits relating to the 19th century are considered to survive below ground surface. The remains of a 5m diameter round buddle is exposed on the lower floors, together with in situ timber lining, a range of timber settling tanks and areas of flooring of edge laid fire bricks, suggesting that other buried features will survive in adjacent areas. In addition, the scheduling includes the remains of a water balance incline, which is one of only two known examples in the North Pennines. This consists of a concrete engine bed, measuring 3.8m by 6m by 1m high, and a walled incline, measuring 2.5m wide with walls 2.5m high on either side. The scheduling also includes the Slate Sill level situated to the west of Coldberry Mine ore works. The level has an intact corbelled arch portal, measuring 1.3m wide by 1.5m high, and adjacent remains of a two-roomed mineshop, measuring 6m by 12m by 2.5m high. At the west end of Coldberry Gutter lie the remains of the Red Grooves mines. These include a number of levels with corbelled arch portals, generally 1.1m wide by 1.3m high, and at least one extant stone-lined shaft measuring 1.2m in diameter. The remains also include a bank of bouseteams (storage bays for unprocessed ore) measuring 40m long by 3m wide by up to 2m high, including at least 10 individual bays. In addition, a small terraced dressing floor with deposits of buddling waste, a rectangular building with walls 1.5m high, and bounded by a revetment wall, lie at the west end of the site. The scheduling also includes the remains of an extensive water management system consisting of a network of leats and dams. The largest of the dams is situated on the watershed between the Bow Lee and Hudeshope becks, above and to the north of Coldberry Gutter. The dam encloses three sides of an approximately rectangular area of standing water. It takes the form of an earthen bank, with an internal edge-laid stone revetment; the external south side is also revetted. The bank averages 1.5m high and is 6m wide on the west side, 10m wide on the south side and 12m wide on the east side. Immediately to the south and running parallel to the south side is an additional lower dam. The dam, which is orientated east to west, consists of an earthen bank 10m wide by 2m high by approximately 80m long. Water from the upper dam appears to have fed into the lower dam through a sluice at the centre of the south bank as well as being diverted around the west end of the lower dam by a leat. Numerous earthworks and denuded sections of leat in this area suggest a complex water management system which was modified over time. Further remains of an additional system lie at the east end of the site and were built to serve the 19th century Coldberry Mine dressing floors. They include at least three well preserved dams fed by a well built, stone-lined leat which collects water from a point at least 1.25km to the north. The dams and the best preserved section of leat are included within the scheduling. All drystone boundary walls, fenceposts and road surfaces are excluded from the scheduling, although the ground benath these features is included.