What is required regarding the relationship of local grid systems to GDA and AHD on plans?

The requirement that the relationship of local grid systems to the Geocentric Datum of Australia (GDA) and the Australian Height Datum (AHD) must be established and shown clearly on plans is essential to maintain accuracy and consistency in surveying and mapping within the mining sector. This clarity ensures that all stakeholders can accurately interpret the spatial data presented, as these datums provide a standard reference for geographical locations and elevations across Australia.

In the context of mining projects, having well-defined relationships between local grids and these national standards is crucial for planning, regulatory compliance, and effective communication among various parties involved, including contractors, government agencies, and surveyors. By clearly depicting this information on plans, it helps to avoid discrepancies that could arise due to misinterpretation of spatial data.

Other options do not adequately represent the legal requirements pertaining to this aspect. While referencing may be beneficial, it is not sufficient on its own compared to the necessity of visual representation. The idea that only government contracts would require this information misrepresents its broader applicability across all mining projects, regardless of parties involved. Lastly, while verification by external auditors can enhance credibility, it is not a mandatory requirement specifically regarding the relationship between local grid systems and standard datums on plans.