Hi Goodasgold,
Welcome to the forum, the Keen a51 is a good sluice and should catch good gold if you are in the right place. I like Goldsborough as it is easy to get to and easy to work, the down side is the gold is fine and there is not much of it compared to the gravel you need to shift to find it. As for New creek fossicking area I would recommend a 4wd to get there as the track is rough in places. There can be water issues if there is a long dry spell as there is not a lot of water to begin with, but there is good gold. I prefer Louis creek, it requires hard work to get to the gold but it is nice flake. I will be up there over the Xmas break. The link is me at Louis creek in March this year.
https://www.youtube.com/watch?v=hqVY1uXgBykCheers Ken.