Coalworks owns the Ashford Limestone Deposit under EL 6511 (NSW). Past geological investigation indicates that the deposit contains exceptionally high quality limestone.

If the quality of the limestone is confirmed by Coalworks then the construction of a process plant and mine is planned capable of producing GCC. Alternatively, a conventional lime plant can produce lime products for cement and other industries, subject to economic viability.

Coalworks plans technical studies aimed at producing a flow sheet and progressing the studies to bankable feasibility stage on the basis of the existing limestone resource with special emphasis on the market for GCC and other value added limestone products. In the south of Coalworks's EL area previous work by a former tenement holder company Kallangur Lime Pty Ltd in 1989 suggests the limestone could also be used for decorative aggregate, glass manufacture and whiting manufacture.

The decision to proceed with a process plant and mine will only be made following completion of a bankable feasibility study. This study would contain expected capital and operating costs as well as the expected revenue that might be derived from the quality of the lime. A key component of this study would be the quality assessment and expected market price based on that quality. The study would contain a sensitivity study showing expected investment returns and viability applicable to various grades of limestone.

In 2009, a drilling program was completed and a review of the potential quality required to produce Ground Calcium Carbonate (GCC) was undertaken. Industrial mineral consultants advised that the grades obtained were sufficient to achieve brightness specifications for selected GCC products. Other products were also considered, whether as a primary product or a by-product to GCC production.