Sir Alfred Hickman Ltd is probably an error for Alfred Hickman Ltd, owners of Spring Vale Iron Works, Bilston Staffordshire which in this period possessed five blast furnaces. Whilst he was knighted, the registered company name omitted his title. (Riden & Owen 'British Blast Furnace Statistics 1790-1980', Cardiff, 1995)
Strahan et al in 'Memoirs of the Geological Survey: Special Reports on the Mineral Resources of Great Britain: Vol.13: Iron Ores (continued). Pre-Carboniferous and Carboniferous Bedded Ores of England and Wales', London, 1920, detail both Ystrad Mine and, seperately, Garreg-fawr Mine.
According to Strahan et al, in 1917, Ystrad, owned by The Silurian Iron Ore Co Ltd of Swansea, was working 300 tons a week of pisolitic ore containing 38% iron, from Cambrian rocks and was described as being 'won by open cuttings and by short levels or galleries driven into the hillside; of these there are eight, numbered from above downward. The ore is excavated by overhand stoping ... timbering is unnecessary, an occasional pillar of ore or dyke rock being left to support the roof. Some of the ore is crushed to four-inch lumps in a jaw crusher driven by a dynamo worked by a gas-engine. None of the ore is calcined. A German calcining-kiln bought by a previous company and tried, proved to be a failure... The ore is put into trucks at an adjacent siding of the N.W.N.G. Rly. and conveyed about 5 miles to Dinas Junction (L.& N.W.), where it is reloaded into trucks of standard gauge. Formerly some of the ore was sent to Brymbo; but in 1917 the whole output went to Messrs. Baldwins Ltd., of Landore, Swansea.' It appears that the Silurian Iron Ore Co may have been a subsidiary of Baldwins, a major south Wales iron, steel and tinplate manufacturer.
Strahan et al described Garreg-fawr Mine, owned by W.J.Roberts of Bryn Meddyg, near Bangor, which was disused, as comprising 'open works and day-levels north-east of the Ystrad Mine ... higher up the side of the valley' and working the same ore and states that 'it is probable that referecnes to iron-ore having been dug at Bettws Garmon at intervals for over 50 years refer to this property.' Alfred Hickman Ltd had abandoned the mine in 1913: 'towards the end of the 1908-13 period the ore was transported by aerial ropeway about 2 1/2 miles north-eastward over the mountain, and delivered at Llanberis Station (L. & N.W.). The ore at that time was smleted at Messrs. Hickman's works.'
Strahan at al also described two other mines at Bettws Garmon:
Tyddyn-bach Mine, also owned by W.J.Roberts, was located half a mile south west of Bettws Garmon Church and was 'an open quarry situated on the outcrop worked at Ystrad across the valley, the bed of ore being 18 feet thick... At the time of our visit (14th Aug., 1917) ore had not been sent away, but some 2,000 tons were ready for despatch.'
Cwm-bychan was very briefly covered: 'in August 1917, Messrs. E.J.Morris and T.H.Roberts were carrying on explorations for ironstone near Cwm-bychan, about a mile south-east of Bettws Garmon ... the bed is presumably different from that worked at Bettws Garmon.'
Somewhere I have seen a builder's photograph of a standard gauge steel hopper wagon for iron ore lettered for Alfred Hickman Ltd, empty to Llanberis. If I can recall its source, I will post it on this thread.