| PRN | Site Name | Summary | Description | url | Form | Period | Type | Broad Class | Condition | Evidence | Status | Status Grade | Status Ref | Unitary Authority | Community | NGR | Easting | Northing |
| 63532 | Beudy'r Ddol | A traditional snowdonia field cowhouse. | Undivided interior, with former loft to N. Three roof trusses, the principals having a blade-like form, with properly tenoned collar beams, each joint 4 x pegged, and with round pole tie beam. The apex is halved and pegged. The trusses carry 2 tiers of squared purlins. A slighter truss survives at the N end, perhaps somewhat earlier in date.Built of rounded boulders laid with minimal mortar and some galletting, typical of the Snowdonia area. Slate roof between raised gable walls with unshaped kneelers. Rectangular in plan with a low door central to the S end, and having a pitching door at the N end to a former hay loft. Green rhyolite lintels. Two vents on the W side, now blocked. | https://archwilio.org.uk/arch/query/page.php?watprn=GAT63532&dbname=$geoGroupId&tbname=core | Post Medieval | COW SHED | Agriculture and Subsistence | Listed Building | II | 21524 | Gwynedd | Dolbenmaen | SH5406149197 | 254061 | 349197 | |||
| 100940 | Blaen-pennant, Dolbenmaen | A post medieval farmstead. | Ruin. Farmstead plan types are explained in detail in Report 1732: Farmstead Mapping Attribute Table (Page 7-9) (Ferreira 2024). | https://archwilio.org.uk/arch/query/page.php?watprn=GAT100940&dbname=$geoGroupId&tbname=core | POST MEDIEVAL | FARMSTEAD | AGRICULTURE AND SUBSISTENCE | NOT KNOWN | DOCUMENTARY EVIDENCE | Gwynedd | Dolbenmaen | SH5402249782 | 254022 | 349782 | ||||
| 21579 | Cwm Dwyfor Mine, Dolbenmaen | General: a short-lived, remote and unproductive site which nevertheless saw substantial and ill-advised investment, situated on a natural bowl in the most northerly reaches of Cwm Pennant, north of Porthmadog. The site is of interest for its powersystem and for the readiness of adventurers to sink capital into untested workings. Geology: lead and copper ores in a gangue of quartz, in slates of Ordovician age. History: alleged to have been worked before 1850, and opened up in 1868 before closing in 1876. Workings: underground. A depression surrounded by waste at SH54085064 may mark the site of a pump-shaft, possibly also a haulage shaft. There is a trace of an adit at SH54155065 and a possible slate trial at SH54235060. Processing: a substantial crusher-house, formerly containing machinery by DeWinton, survives at SH54115057, and is now extremely dilapidated. It is heavily buttressed on the south side. An open-fronted shed at SH54125056 is not unlike a slate quarry gwal, and may have been connected with processing. Power: a pit for the DeWinton waterwheel survives on the west side of the crusher-house, with a winding-drum box on its west side. Two parallel rows of stone columns run towards the putative shaft-site at SH54085064, one possibly for a launder to the wheel the other possibly to support flatrods. Transport: the trace of a ramp survives to the north of the crusher, possibly connected to a tramway from the adit at SH54155065. A counterbalanced incline connected the mine to the Gorseddau Railways, and hence to the sea at Porthmadog, making it the only metalliferous mine in Gwynedd with a direct rail connection from the processing floor to the harbour. Ancillary: a roofless and dilapidated building at SH54125059 may have been a weighbridge. Other dilapidated structures, of uncertain function, are at SH54085065 and to the west of the parallel rows of pillars . A new smithy, a powder magazine and a dynamite magazine are recorded in 1876. Domestic: a barracks block was noted at SH54235065, orientated north to south, consisting of three rooms, each separately accessed by a door in the western longitudinal wall. No trace of hearths was evident. | https://archwilio.org.uk/arch/query/page.php?watprn=GAT21579&dbname=$geoGroupId&tbname=core | Earthwork | POST MEDIEVAL | MINE | Industrial | NOT KNOWN | EARTHWORK | Gwynedd | Dolbenmaen | SH542506 | 254200 | 350600 | ||||
| 21580 | Cwm Dwyfor North Mine, Dolbenmaen | https://archwilio.org.uk/arch/query/page.php?watprn=GAT21580&dbname=$geoGroupId&tbname=core | Earthwork | POST MEDIEVAL | MINE | Industrial | NOT KNOWN | EARTHWORK | Gwynedd | Dolbenmaen | SH542511 | 254200 | 351100 | |||||
| 101245 | Cwm-trwsgl, Dolbenmaen | A post medieval farmstead. | Ruin. Farmstead plan types are explained in detail in Report 1732: Farmstead Mapping Attribute Table (Page 7-9) (Ferreira 2024). | https://archwilio.org.uk/arch/query/page.php?watprn=GAT101245&dbname=$geoGroupId&tbname=core | POST MEDIEVAL | FARMSTEAD | AGRICULTURE AND SUBSISTENCE | NOT KNOWN | DOCUMENTARY EVIDENCE | Gwynedd | Dolbenmaen | SH5438349333 | 254383 | 349333 | ||||
| 101260 | Dol-Ivan-Geithin, Dolbenmarn | A post medieval farmstead. | Ruin. Farmstead plan types are explained in detail in Report 1732: Farmstead Mapping Attribute Table (Page 7-9) (Ferreira 2024). | https://archwilio.org.uk/arch/query/page.php?watprn=GAT101260&dbname=$geoGroupId&tbname=core | POST MEDIEVAL | FARMSTEAD | AGRICULTURE AND SUBSISTENCE | NOT KNOWN | DOCUMENTARY EVIDENCE | Gwynedd | Dolbenmaen | SH5389249310 | 253892 | 349310 | ||||
| 59327 | Gorsedda Junction And Portmadoc Railways | A 0.6 metre (2') gauge railway built partly on the track-bed of the former Gorsedda railway (PRN: 59328) and partly on a new formation to connect the slate quarries at Bwlch y Ddwy Elor (Prince of Wales quarry [PRN: 20221]) and other workings (peat and copper) with Porthmadog. Opened in September 1875 but saw little traffic and dismantled in the 1890s. It was built for locomotive operation. (Davidson and Gwyn, 2014) A locomotive-worked railway, completed in 1875, which involved the construction of a new section of railway from Cwm Dwyfor copper mine and Prince of Wales slate quarry to meet the existing track-bed of the Gorsedda railway at SH 5525 4398, to connect with Porthmadog harbour. Historical description A locomotive-worked railway to 0.6 m gauge, 8.267 km long, built under Act of Parliament, completed in 1875, making use of the abandoned formation of the Gorsedda railway from Braich y Big to Porthmadog harbour but which also involved the construction of a new section of railway from Cwm Dwyfor copper mine and Prince of Wales slate quarry to the existing track-bed. Traffic-levels were disappointing. The section from Cwm Dwyfor to Prince of Wales is shown as having been dismantled on the 1889 ordnance survey; the whole length of the railway was probably out of use by 1891, and was dismantled by 1900. Site description The railway follows a sinuous course from the foot of an incline at the Cwm Dwyfor copper mine (NPRN: 287709; PRN: 21579) at SH 5406 5024 along the eastern slopes of Cwm Pennant. At SH 5458 4928 the incline from Prince of Wales slate quarry (NPRN: 40567; PRN: 20221) connects with it, adjacent to the quarry?s slab mill (NPRN: 287785; PRN: 61162). The formation is for the most part lightly engineered, and runs against the load to the point where it reaches the summit of the col between Moel Isallt and Moel Hebog at SH 5407 4469, after which it drops steeply to Braich y Big and the junction with the Gorseddau railway. On the topmost (quarry end) part of the route, stone causeways predominate, giving way to earth formations, these causeways and formations are no more than 0.5m high. There are a few short rock cuttings along the upper sections of the line, and a approximately 60m long earth cutting near Cwm Llefrith at SH5433 4534. Sleeper impressions are visible at several locations, such as SH 5457 4923 to SH 5439 4896. The formation is carried across many small tributary streams of the Afon Dwyfor and field drainage channels. Bridges of note include that crossing the Afon Trwsgl at SH5458 4925 (NPRN 23771; PRN: 65599); at SH 5420 4835 (NPRN 288211; PRN: 65600); at Cwm Llefrith, SH 5437 4658 (NPRN: 546037; PRN: 65601) which is the most substantial along the course, with dilapidated stone abutments 10m high and at Ceunant Ddol SH 5438 4534 (NPRN: 546038; PRN: 65602), the only bridge with a middle pier. At SH 5413 477 (NPRN: 546036; PRN: 1417), adjacent to the south side to the railway as it passes around the edge of an enclosed field there is a substantial rectangular stone platform 1m high. It is unclear whether this is associated with the railway or the enclosure to the north. At SH 5427 4507 the formation passes through an area of Medieval settlements associated with the settlement of Ceunant y Ddol (NPRN: 302569; PRN: 1410), where there is evidence of shallow quarrying and of a stone dump, perhaps associated with the railway?s construction. Some stretches of the railway are barely apparent, in particular from SH 5412 4777 to SH 5432 4769. At SH 5520 4405 it crosses the road to Cwmystradllyn on the level, and thereafter is covered in thick forestry to the point where it joins the formation of the Gorsedda railway (NPRN: 34663; PRN: 16874) at SH 5525 4398. (Barker and Gwyn, 2017) The railway systems serving the two quarries and connecting them to Porthmadog harbour exemplify different approaches to construction – the well-engineered horse-and gravity-worked line of 1857 on a constant down-gradient to assist movement of the load, by James Brunlees (1816–1892) to Gorsedda quarry, and the very light and cheaply-built locomotive-worked formation of 1875 to Prince of Wales quarry, the Gorseddau Junction & Portmadoc Railways. Brunlees had already worked on the Londonderry and Coleraine Railway and on the Ulverston and Lancaster. Once he had completed the Gorsedda contract, Brunlees sent his assistant Daniel Makinson Fox (1830-1918) to survey the challenging São Paulo Railway in Brazil. Fox spent most of the rest of his career in Brazil (Barker & Gwyn 2018). | https://archwilio.org.uk/arch/query/page.php?watprn=GAT59327&dbname=$geoGroupId&tbname=core | Post Medieval | RAILWAY | Transport | Not known | DOCUMENTARY EVIDENCE;HISTORIC LANDSCAPE | Gwynedd | Dolbenmaen | SH54045043 | 254040 | 350430 | |||||
| 101764 | Outfarm, South of Cwm-trwsgl, Dolbenmaen | A post medieval outfarm. | Ruin. Farmstead plan types are explained in detail in Report 1732: Farmstead Mapping Attribute Table (Page 7-9) (Ferreira 2024). | https://archwilio.org.uk/arch/query/page.php?watprn=GAT101764&dbname=$geoGroupId&tbname=core | POST MEDIEVAL | OUTBUILDING | UNASSIGNED | NOT KNOWN | DOCUMENTARY EVIDENCE | Gwynedd | Dolbenmaen | SH5439949310 | 254399 | 349310 | ||||
| 101816 | Outfarm, South-West of Dol-Ifan-Gethin, Dolbenmaen | A post medieval outfarm. | Partial ruin. Farmstead plan types are explained in detail in Report 1732: Farmstead Mapping Attribute Table (Page 7-9) (Ferreira 2024). | https://archwilio.org.uk/arch/query/page.php?watprn=GAT101816&dbname=$geoGroupId&tbname=core | POST MEDIEVAL | OUTBUILDING | UNASSIGNED | NOT KNOWN | DOCUMENTARY EVIDENCE | Gwynedd | Dolbenmaen | SH5406249194 | 254062 | 349194 | ||||
| 3344 | Perforated Stone, Findspot, Cwm Trwsgl | A round stone with central hourglass perforation found by the side of the lane between Cwm Trwsgl and Cwm Dwyfor. It may have been used as a sharpening stone. It has been lent to the Museum of UCNW. <1> In private possession. <2> | https://archwilio.org.uk/arch/query/page.php?watprn=GAT3344&dbname=$geoGroupId&tbname=core | Find Only | ROMAN | FINDSPOT | Object | NOT KNOWN | FIND | Scheduled Monument | CN410 | Gwynedd | Dolbenmaen | SH544493 | 254400 | 349300 | ||
| 61884 | Posts, Bwlch Dros Bern | Two posts, possibly fence posts, associated with mine winching equipment. | Two possible fence posts, located either side of a shelter (NPRN 287988). Cast into them, inscribed, 'BOLT PLATE, FRANCIS MORTON PATENT, LIVERPOOL'. Standing on and bolted into bases. These posts look like a piece of machinery - there are remains of cog wheels and different brackets for the insertion and straining of wires. May have been part of some form of mining winching equipment rather than fence posts. They probably were a fairly sophisticated (and expensive) type of post, and appear to have lasted in situ for a century and a half. (Elis-Williams, 2016). | https://archwilio.org.uk/arch/query/page.php?watprn=GAT61884&dbname=$geoGroupId&tbname=core | MODERN | POST | Industrial | INTACT | DOCUMENTARY EVIDENCE | Gwynedd | sh5315650779 | 253156 | 350779 | |||||
| 61164 | Railway, Prince of Wales Quarry | https://archwilio.org.uk/arch/query/page.php?watprn=GAT61164&dbname=$geoGroupId&tbname=core | POST MEDIEVAL | RAILWAY | Transport | INTACT | STRUCTURE | Scheduled Monument | CN410 | Gwynedd | Dolbenmaen | SH5443649304 | 254436 | 349304 | ||||
| 39011 | Sheep Fold, Ceunant Yr Allt | https://archwilio.org.uk/arch/query/page.php?watprn=GAT39011&dbname=$geoGroupId&tbname=core | Other Structure | POST MEDIEVAL | SHEEPFOLD | Agriculture and Subsistence | NOT KNOWN | DOCUMENTARY EVIDENCE | Snowdonia National Park | Gwynedd | Dolbenmaen | SH5316850517 | 253168 | 350517 | ||||
| 38925 | Sheep Fold, Cwm Dwyfor | https://archwilio.org.uk/arch/query/page.php?watprn=GAT38925&dbname=$geoGroupId&tbname=core | Other Structure | POST MEDIEVAL | SHEEPFOLD | Agriculture and Subsistence | NOT KNOWN | DOCUMENTARY EVIDENCE | Snowdonia National Park | Gwynedd | Dolbenmaen | SH5403250539 | 254032 | 350539 | ||||
| 38926 | Sheep Fold, Cwm Dwyfor | Shown as simple oval sheepfold on 25 inch County Series map. (Kenney, 2014) | https://archwilio.org.uk/arch/query/page.php?watprn=GAT38926&dbname=$geoGroupId&tbname=core | Other Structure | POST MEDIEVAL | SHEEPFOLD | Agriculture and Subsistence | NOT KNOWN | DOCUMENTARY EVIDENCE | Snowdonia National Park | Gwynedd | Dolbenmaen | SH5385551139 | 253855 | 351139 | |||
| 39012 | Sheep Fold, Cwm Dwyfor | https://archwilio.org.uk/arch/query/page.php?watprn=GAT39012&dbname=$geoGroupId&tbname=core | Building - Ruined | POST MEDIEVAL | SHEEPFOLD | Agriculture and Subsistence | NOT KNOWN | DOCUMENTARY EVIDENCE | Snowdonia National Park | Gwynedd | Dolbenmaen | SH5390950329 | 253909 | 350329 | ||||
| 83784 | Sheepfold, Mynydd Drws-y-coed | Sheepfold marked on the Ordnance Survey first edition map of 1891. | https://archwilio.org.uk/arch/query/page.php?watprn=GAT83784&dbname=$geoGroupId&tbname=core | POST MEDIEVAL | SHEEP FOLD | AGRICULTURE AND SUBSISTENCE | NOT KNOWN | STRUCTURE | Gwynedd | Llanllyfni | SH5505651531 | 255056 | 351531 | |||||
| 39013 | Shelter, Mynydd Tal-y-mignedd | https://archwilio.org.uk/arch/query/page.php?watprn=GAT39013&dbname=$geoGroupId&tbname=core | Building - Ruined | POST MEDIEVAL | SHELTER | Domestic | NOT KNOWN | DOCUMENTARY EVIDENCE | Snowdonia National Park | Gwynedd | Llanllyfni | SH5315650779 | 253156 | 350779 | ||||
| 20217 | Slate Quarry, Cwm Dwyfor | https://archwilio.org.uk/arch/query/page.php?watprn=GAT20217&dbname=$geoGroupId&tbname=core | POST MEDIEVAL | SLATE QUARRY | Industrial | Gwynedd | Dolbenmaen | SH541505 | 254100 | 350500 | ||||||||
| 20215 | Slate Quarry, Dolgarth | https://archwilio.org.uk/arch/query/page.php?watprn=GAT20215&dbname=$geoGroupId&tbname=core | POST MEDIEVAL | SLATE QUARRY | Industrial | Gwynedd | Dolbenmaen | SH538495 | 253800 | 349500 |