1900 South Clifton installs coke ovens adjacent to railway
1900 Excelsior No.1 Colliery - commences - J. S. Kirkton (just north of Bulli Pass)
1900 South Bulli Colliery - sold by Ebenezer Vickery to Bellambi Coal Co.
1901 Mt. Keira Colliery - 21st May - John McGeachie replaced by Jacob Carlos Jones (ex manager of Sth Bulli & Austinmer Collieries.
1901 Mt. Keira Colliery - purchased by Ebenezer Vickery from the Osborne family
1901 South Bulli Colliery - sold by Ebenezer Vickery to Bellambi Coal Co.
1902 Nth Bulli (new) Colliery - opened immediately above Coledale railway station under the control of Hyde & Cater, on the site of previously abandoned mine
1902 Coalcliff Colliery - purchased by E. Vickery & Sons
1902 Sth Bulli Colliery - purchased by Bellambi Coal Co.
1902 Government takes over Southern Coal Co.
1902 Mt. Kembla Colliery - disaster July 31st.- 95 men died - mine reopens 24th Sept.
1903 Tongarra Colliery - Percy Owen takes over from William Brownlee as mine operator.
1904 Tongarra Colliery - in 300' from outcrop. Murray Brownlee manager for Yuill & Co. of Corrimal
1904 Coalcliff jetty lost in storm (150')
1904 Black Ball Colliery - (Pors. 82 & 83 Woonona) 7' seam dirty. Probably Plunketts Hill or Tongarra seam
1905 Excelsior No.2 Colliery - commences - Ryan (immediately below Bulli Pass Lookout) Combined w/- Excelsior No. 1
1906 Corrimal Colliery (aka Brokers Nose) - 91' upthrow fault encountered - new entrance established 1.5 km sth - by G. S. Yuill & Coy. Pty Ltd. and to be known as Corrimal-Balgownie Colliery
1907 Bulli Bight - jetty rebuilt - damaged
1908 Corrimal Colliery - 780' x 14' vent shaft (#1) sunk. Fitted with Sirocco, 91" dia. double inlet fan
1908 Tongarra Colliery - further development by Percy Owen
1908 Sth. Clifton Tunnel Colliery - opened
1909 Coalcliff Colliery - purchased by Coalcliff Collieries Ltd.
1909 Balgownie Colliery (Owen's) - commenced near Mt. Pleasant in 4' seam.
1909 Bulli Colliery - delay due to basalt dyke encountered
1909 Bellambi jetty - rebuilt
1910 Coalcliff jetty - abandoned
1910 Tongarra Colliery (Owen's) - commenced. Operated till early 1920's
1911 Coke ovens erected near Corrimal by Southern Coal Co. moving from Unanderra
1912 Australian Coke Making Co. at Unanderra closes.
1912 Sth. Clifton Colliery - tunnels driven to replace shafts.
1912 Bulli Bight - jetty rebuilt - damaged
1913 Balgownie Colliery (Owen's) - closed
1913 Mt. Kembla Colliery - Mount Kembla Collieries Ltd. takes over. (until 1946)
1914 Tongarra Colliery - 6 ton sample to Sydney w/- prospect of supplying railways - did not succeed in bid.
1915 Wongawilli Colliery - opens in Wongawilli seam
1916 Five Islands Point jetty in constant use till now.
1916 Wongawilli Colliery - holdings purchased by G & C Hoskins & Development commenced
1917 Bulli Colliery - coal cutters withdrawn due to concern with dust & gas.
1917 Woonona Colliery - closes??
1918 Part of Brokers Nose collapses in large land slip.
1919 South Clifton Colliery - closes, plus the 32 coke ovens . Remaining coal to be extracted by the adjoining mine at Wombarra.
1920 Wongawilli Colliery - Washery (first on Sth Coast) installed plus 40 coke ovens
1920 Mt. Kembla Colliery - Machines withdrawn - concern with dust & gas.
1920 Illawarra Colliery - Illawarra Coal Co. acquires leases & opens colliery (by 1933 known as PK 2 Colliery
1920 South Clifton Shaft closes down.
1920 Bulli Jetty still in use (fig.97 CMHA)
1921 Metropolitan Colliery - Huddart Parker Ltd. takes over
1921 Mt. Kembla Extended Colliery (previously Owen's Balgownie Colliery) opens
1922 Bellambi Colliery - closes (Sth Bulli ???)
1924 Clifton Jetty - demolished
1925 Wongawilli Colliery - additional 40 coke ovens installed
1925 Bulli Colliery - delayed when cinder encountered
1925 Corrimal Colliery - 1120' x 17' vent shaft (#2) sunk.
1925 Metropolitan Colliery - CO2 outburst, 200 tons, kills 2 miners.
1925 Mt. Kembla Colliery - replaces furnace with fan.
1925 Five Islands Point jetty derelict until 1925 (9m water @ low tide & load coal @ 300t/hr)
1926 Nth Bulli Colliery - closes. (reopened on small scale later)
1927 Nth Bulli Colliery - closes.
1929 South Bulli No 1 Shaft reaches coal.
1932 Parke’s Tongarra opens. Works for ~ 2 years.
1933 Sth Kembla Colliery (adjoining Wongawilli Colliery to the north, acquired by G & C Hoskins
1933 Mt. Pleasant Colliery closes.
1934 Mt. Pleasant Colliery goes into liquidation.
1934 Mt. Pleasant Colliery (Nthn side of Mt. Keira) purchased by E. Vickery & Sons 10/9/34
1935 Mt. Pleasant Colliery taken over by Vickery & Sons (except MP.16) and renamed Keira Pleasant Tunnels
1935 Wongawilli Colliery & Pt Kembla Steelworks - purchased by BHP
1936 Old Bulli Colliery - purchased by AIS
1936 Mt. Kembla Extended Colliery - closes.
1936 Wongawilli Colliery - longest haulage incline in world installed.
1937 Mt. Keira Colliery - purchased by AIS on 26th January (includes Mt. Pleasant Colliery) from Vickery & Sons
1937 Mt. Keira Colliery - holes into Mt. Pleasant Colliery (5NE hdg in MP.15) 5th August
1938 Coke works at Wongawilli Colliery closed - reopens in 1941 because of wartime demand
1938 Mt. Pleasant Power Station restarted to supply Mt. Keira Colliery
1938 Mt. Keira Colliery - Samson Coal Cutter, Blackett Conveyor & 9x Sullivan Coal Cutter introduced
1939 Corrimal Colliery - Jeffrey cutters introduced
1940 Tongarra Colliery - purchased by Excelsior Collieries. (Parkes )
1940 Mt. Keira Colliery - takes electric power from steelworks
1940 Metropolitan Colliery - 8BU loaders introduced
1940 Mt. Kembla jetty condemned.
1941 Wongawilli Colliery - Coke works reopens
1941 Prospecting in #3 seam at Mt. Keira & Mt. Pleasant by BHP for future utilisation
1941 Port Kembla No 2 - Colliery opens
1942 Mt. Keira Colliery - operates diesel locos u/g
1942 North Bulli Colliery - re-opens
1943 Tongarra Colliery purchased by Excelsior Collieries of Thirroul. (R. Fullager then A. Smith as manager ).
1943 Bulli jetty at Sandon point washed away in storm - abandoned (8m water at jetty & loaded @ 120t/hr)
1944 Coal Cliff Colliery taken over by Commonwealth Coal Commissioner
1945 Mt. Kembla Colliery purchased by AIS Ltd. (until 1970)
1946 Nebo Colliery opened by BHP in Wongawilli seam (using track mounted mechanisation)
1946 Mt. Keira Colliery - operations started in Wongawilli seam in April (in addition to Bulli seam)
1946 Huntly Colliery commences as small, privately owned mine by Waugh Bros.
1947 Wongawilli Colliery - track mounted machine loading introduced
1947 Tongarra Colliery - May - G. Roberts takes over from A. Smith as manager
1947 Sth Bulli Colliery - scraper loaders introduced
1947 Coal Cliff Colliery - control by Commonwealth Coal Commissioner lifted
1948 Coke works & washery at Wongawilli closed
1948 Excelsior No.1 Colliery closes
1948 Kembla - Keira Tunnel - work commences
1949 Bulli Colliery - contract mining ceases
1949 Kembla - Keira Colliery (Kemira Colliery) - contract mining ceases
1949 Kembla - Keira Colliery fully mechanised
1949 Bulli Colliery - coal cutters withdrawn due to concern with dust & gas.
1949 Woonona Colliery - closes??