Problem is to have the right type of shaft. Need to know if it was hard-rock gold, shallow alluvial or deep lead gold. Dumps on the first case are much less productive for nuggets than the second, and in the third (or deep cases of the first) anything likely to contain gold was trammed away from the shaft (so its dump is not where to look). Also some shafts went through old sands in the area you are talking about, and these tend to be barren and dominate the dumps. In other cases different rocks were passed through at different levels on the way down, so you need to know which part of the dump to look. You guys may know that but some beginners would not. However there are plenty of shallow alluuvial dumps in that area.....