The Festiniog Railway served a cluster of quarries around the town of Blaenau Ffestiniog. Most of these were slate quarries, although granite quarries and zinc mines were also connected by narrow gauge tramways to the railway.[1]
| Name | Opened | Closed | Years connected | Notes |
|---|---|---|---|---|
| Blaen-y-Cwm | 1820 | 1911 | 1876–1911 | Connected to the FfR via the Rhiwbach Tramway |
| Bowydd | 1800 | 1870 | 1854–1870 | Merged with Votty to form Votty & Bowydd quarry |
| Bwlch-y-Slater | 1824 | 1960 | 1866–1956 | Connected via the Rhiwbach Tramway |
| Cesail | 1827 | 1877 | 1836–1877 | Became part of the Oakeley Quarry |
| Conclog | 1872 | 1920? | 1874–1920 | Remote quarry connected by the Cwmorthin Tramway |
| Cwm Orthin | 1810 | 1937 | 1850–1937 | Connected via the Cwmorthin Tramway; became part of the Oakeley quarry in 1900, the two quarries were connected underground |
| Cwt-y-Bugail | 1835 | 1972 | 1867–1961 | Last quarry using the (by then partly lifted) Rhiwbach Tramway |
| Diphyws (Diphwys Casson) | 1760 | 1972 | 1860–1955 | Last of the major quarries to be connected to the Ffestiniog Railway |
| Glan-y-Pwll | 1840s | 1882 | 1867–1882 | Became part of the Oakeley Quarry |
| Groby Granite Quarry | Circa 1932 | 1914-1932(?) | Connected via a short branch worked by FfR locomotives. | |
| Hafodty (Votty) | 1801 | 1870 | 1851–1870 | Joined with Bowydd quarry to form Votty & Bowydd |
| Llechwedd | 1846 | Present | 1848-1980s | Currently worked on a small scale and the site of the Llechwedd Slate Caverns tourist attraction |
| Maenofferen | 1848 | Present | 1848–1975 | Became the major owner of quarries connected via inclines at Duffws station, continued to use the stub of the FfR through Blaenau into the mid 1970s. Untopping operations continue in 2007. |
| Matthews (Rhiwbryfdir) | 1825 | 1871 | 1842–1871 | Became part of the Oakeley quarry |
| Moelwyn | 1826 | 1900 | 1867–1900 | Remote quarry connected to the FfR by a series of seven inclines; worked intermittently and never successfully. |
| Oakeley | 1878 | Present | 1878-1950s | Formed by the amalgamation of the Cesail, Matthews and Glan-y-Pwll quarries. Was the largest single quarry in Blaenau Ffestiniog. Was the home of the Gloddfa Ganol tourist attraction in the 1980s and 1990s. Now worked as an open pit by Alfred McApline Ltd. |
| Rhiwbach | 1812 | 1953 | 1860–1953 | Remote quarry situated 4 miles (6.4 km) east of Duffws station and connected via the Rhiwbach Tramway |
| Votty & Bowydd | 1870 | 1964 | 1870–1962 | Formed by the amalgamation of the Hafodty and Bowydd quarries. |
| Wrysgan | 1830s | 1946 | 1844–1946 | Connected to the railway near Tanygrisiau via a single long incline ending in a tunnel. |
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