Ann: Quarterly Activities/Appendix 5B Cash Flow Report, page-4

That totally depends on the size of area they intend to cover, cost wise can be from 20k upwards per 50sqm depending on who's doing it.

Gravity is a key part of defining the drill target. When using this exploration tool by applying it to a new search area there is potential to make a new discovery of high-grade massive mineralization. The ground gravity survey might comprise several grids targeting the areas of highest geological potential.

The survey when undertaken if the search space has been narrowed down sounds like that HH is focusing on specific geological targets. The intent maybe is to use ground gravity to directly detect subsurface density anomalies associated with potential bodies that may lie within the intended targets at approximately 100-200 m of surface area or more...so the costs may well be in the vicinty of 100k to 200k imho but again that's depending on total area size they want to survey, hope this helps a little.