Stockmen were the first white people to enter the Joadja area. The Carter family used Joadja regularly and in the early 1850s Edward Carter noticed the shiny black mineral on seams out-cropping high up on the cliffs. In the late 1870s, after American Creek and
Hartley Vale became well-known, Carter set about acquiring critically important shale bearing parts of the valley. His five portions totalled an area of 305 acres (125 hectares). Carter controlled both major fords and most of the dray-road north through Carter's Flat up to Siphon Gully. The shale mining resulted in employment directly connected with the mines. The population was at its highest from 1878 until 1885. A post office was opened in 1878 and remained open until it was burnt down in the bush fire of December 1904. In 1879 a temporary school of slab and bark was erected for some fifty children. In 1882 a fine stone building was built for the 90 children of Joadja, of which 60 were expected to attend on average. After a fire in 1882, one of the few accidents at Joadja, a number of safety precautions were taken. Between 1883 and 1886 a good deal of capital investment produced many modifications to existing buildings and plant, a doubling of the capacity of the distillation facilities and the addition of new features. In particular the manufacture of its own
sulphuric acid for use in the refinery. Other manufacturing included packaging the kerosene in tins and a candle-moulding shop. In 1886 the School of Arts was constructed and was used for regular church services by ministers from Mittagong. As a result of competition from cheap American imports the refinery and the retorts closed in 1896. Between 1901–1902 there may have been a brief resumption of mining but in 1904, after 28 years, Joadja ceased to exist as a shale producer. In 2004–05, the site received federal government heritage funding to help roof and protect the unique historic retorts. ==Timeline==