In May 1897 the firm purchased from the syndicated company headed by
John Scholey (the original owner of the land) the partially developed Richmond Vale Colliery located in the Wallis Creek valley near what would be latter known as
Kurri Kurri for £39,500. In August 1900, prior to the purchase of Pelaw Main Colliery, J & W Brown had applied for an act of parliament to allow the construction of a railway line connecting their existing Minmi to Hexham railway to Richmond Vale Colliery. In October 1900 the
Richmond Vale Coal Mine Railway Act of 1900 was passed by the State Parliament allowing the construction of the railway which was known as the
Richmond Vale Railway. In October 1900 J & W Brown brought the nearby Stanford Greta Colliery from the Stanford Greta Coal Company, this company had divided its holding into Stanford Greta and Stanford Merthyr Collieries. As Stanford Greta was on the outcrop of the coal seam it could be developed at a lower cost than Richmond Vale Colliery, so Browns concentrated their efforts on developing this mine which they renamed
Pelaw Main Colliery in April 1901. The coal from
Pelaw Main was initially sent away via the East Greta Coal Mining Company's
Railway to East Greta Junction. Financed by the output of Pelaw Main Colliery, construction of the Richmond Vale Railway commenced in 1904 and was completed to Pelaw Main Colliery in June 1905. From August 1905 all coal from Pelaw Main was hauled by the Browns over this railway to Hexham, the railway line to Richmond Vale Colliery was also fully completed in August that year. In 1910 work commenced on developing Richmond Vale Colliery with the sinking of the main shaft and the ordering of plant & equipment from England. In 1911 the colliery's name was changed to
Richmond Main Colliery. John Brown planned for the colliery to be the showpiece of the J & A Brown empire and so the buildings were constructed from either brick or reinforced concrete. The colliery was to be electrically powered and a large for its time power station was constructed to house the two generator sets along with the main shaft electric winding engine. To supply the bricks required for many of the buildings at Richmond Main, a brickworks was built on land near the colliery. The distinctive red bricks from these brickworks were also used at many other J & A Brown sites. The mine reached full production in 1918 when it was producing 700 tons of coal per day. By the early 1920s the colliery was producing 2,000 tons per day and on 8 August 1928 an Australian record of 3,171 tons produced in a single shift was made. A third shaft was sunk at the colliery in the mid-1920s along with extensions and improvements to the power station. Some of the planned improvements at the colliery were never fully completed due to the 1929-1930 miners' lockout strike and the death of John Brown. ==Stockrington Colliery and the end of Minmi==