I've been meaning to knock up an "poor man's" Excel estimation template and here it is!
It works by using the drill sections as a background to an Excel spreadsheet then averaging the grades in the drill trace captured by each spreadsheet cell. The cells that don't capture any portion of a drill trace are estimated by averaging the neighbouring 8 cells that surround it. Grades in bold are overlaying drillhole traces containing results.
Technically speaking it's a fuzzy combination of Inverse Distance, Nearest Neighbour and Polygonal estimation.
The plan is used to add the buffers and estimate the horizontal area:
....and here is the resource tabulation. Not bad huh?
