Another company, the New Conglog Slate and Slab Company Ltd, was created, and bought the lease from Betteley and Gillow for £2,000. The capital was raised by issuing 80 shares valued at £25 each, and Gillow bought 65 of them. Horswill became the secretary of the new company, but after just four years, he recommended in 1885 that it too should be wound up, and another company formed to take it over. Roberts, who still held the primary lease, offered to alter its terms in 1886, but it is unclear whether this happened. In 1889, the 21-year lease ran out, and Roberts negotiated with the company for its renewal and extension. Although they agreed, the company had still not received a lease after 18 months, and went into liquidation in 1891. Roberts died the following year. Newspaper advertisements for the sale indicated that the company had assets of £2,011, £200 of stock, and liabilities of £3,621. No buyers were found, and the quarry was abandoned, without any machinery being removed. An agreement was made with Lord Harlech that any new tenant found to operate the quarry would pay £200 to take it over. Ronald Robert Hamilton Lochart Ross Esq. took over the quarry in 1895, trading as Glyn Ffestiniog Quarry. He took out a 21-year lease, with a 7-year lease on the Cwmorthin tramway, and options to renew that for two further 7-year terms. He lasted until 1901, when he handed over the running of the quarry to a consortium of six quarrymen from Tanygrisiau. Although they traded as the Glyn Ffestiniog Slate and Slab Quarry, it was an informal partnership. 1902 and 1903 were the most productive years for the quarry, and from 1903, when Ross surrendered his lease, Cadwaladr Roberts, one of the six quarrymen, acted as agent. The last documented load of slate to leave the quarry was in 1909, and it closed in 1910. In the absence of any firm evidence, slate probably left the quarry by horse and cart or by pack animal during the early phases of the quarry, but in 1868 an agreement was reached with Cwmorthin, which would allow the Conglog to lay rails down the valley. As part of the dispute which occurred with Rhosydd in 1871, they were also given permission to lay rails up to Rhosydd, and to use their incline down to the Croesor Tramway.