Burra Group metasedimentary argillite and quartzite beds outcropping 3 km north of Birdwood, which have been altered during a Tertiary deep weathering event, are excavated by the licensee to produce refractory and other industrial raw materials. Recorded production from June 1971 until June 1975 has totalled 35,555 tonnes of white clay-shale which is utilised for fireclay, white clay and kaolin products, and 30,635 tonnes of decomposed quartzite used for refractory silica and road construction material. The alumina content of the fireclay product, on a calcined basis, ranges from 18-46.2% and averages 37.0%. The fireclay's softening point and fusion point average 1710 degrees Celsius and 1730 degrees Celsius respectively. The kaolin is yellowish-white in colour, and as-mined it falls below the grades required for ceramic and paper-filling applications. An investigation of suitable treatment methods to improve its colour is necessary. An evaluation of the suitability of preparing washed silica as an industrial milled product is also warranted. A recent core drilling programme of 22 vertical rotary holes totalling 908 m, plus downhole sampling and geological mapping, has provided a basis for defining economic quarrying limits. Within the proposed quarry development plan area, 3.89 million tonnes of white clay-shale and 4.25 million tonnes of decomposed quartzite are available to extract.