SRK China was commissioned to review several dimension stone projects, including marble and granite projects. Compared to metal mining projects, dimension stone projects have the following unique features.
Special resource estimation method
Normally, grade interpolation is not required for dimension stone projects, and the geological models are mostly based on lithology, structure, and slice pattern. The geological model is used to define the volume and structural influence. Detailed structure logging for fractures is an important reference for the geological model and provides the quality continuity required to assert dimensional stone resources.
Different data validation approach
As quantitative assay results are not used in the resource estimate or assessment of the stone quality, standard samples, blank samples, and assay samples are not
suitable for data validation. The emphasis is on features such as compressive strength, flexural strength, abrasion resistance, water absorption, hardness,
glossiness, radioactive properties, and density. Independent sampling for these
features is used for data validation.
Waste rock dump
The block yield for dimension stone projects is usually less than 20%, meaning that to obtain 20 m³ of quality quarry stones, at least 80 m³ of waste rock will be produced. Although such waste rock can be used as construction or other raw materials, it still requires quantitative assessment. Sufficient temporary stockpiles and a waste dump with corresponding capacity are required.
Market sensitivity
Unlike metal commodities, dimension stone projects are extremely market sensitive and the value is dominated by transport costs. For early-stage projects, market analysis is required to make sure the products can be sold as planned, and it is highly recommended to acquire sale contracts and sound sales records before the project enters the capital market.
With technical capabilities and market experiences, we support our clients with their projects from early stage to capital market, and finally to successful operation.
