On the north side of the Wolgan Valley, opposite Donkey Mountain, William Lamb (1852-1936) discovered loose kerosene shale c1885. Ref: Carne, Joseph. The Kerosene Shale Deposits of NSW, 1903, p. 179. Ignatius Wall took out a Mineral Lease 24th July 1906 for the purpose of Shale and Coal. The Mining survey was completed 10th December 1908 which shows Lambs Tunnel at the southern part of the 640ac lease. The plan also has the sum recorded of 87 pounds. Ref: Plan of Portion MP 44, Parish of Goollooinboin and Wolgan, County of Cook. S1891. A number of the Lamb family members held land in the Wolgan area - Frederick, William and Albert Lamb. Ref: Survey Plan 495, 518, 612, 1856 and 1858.1507. Albert Lamb occupation was listed as, ‘Miner’. Note: Ignatius Wall of which Walls Cave, Blackheath is named after him, held a number of mining leases one such was on Narrow Neck, Katoomba. Ref: Keats, Michael & Fox, Brian. The Passes of Narrow Neck, 2008, p. 71.
Lambs Tunnel is located below Collett Gap and above the Wolgan Road on private property.