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Gorseddau Quarry

The now disused Gorseddau Slate Quarry was first opened 1807, as a small concern, but its main period of working was between 1854 and 1857. The quarry was a complete commercial failure. Despite massive capitalisation and investment in milling, water courses and reservoir, workers' housing and railway to Porthmadog, returns were derisory. By 1859, its 200 men were producing less than 1400 tons per annum - seven tons per man year. Output peaked at 2140 tons in 1860. The quarry closed in 1867, possibly with some later sporadic working.