General Tip of First Hog Pan
Once you get your first gold Bar which is like £30+ which is a bit crazy, after that they go down in oz, to help you start off I can imagine.
You end up around 2 oz per gold bar.
Once that gold bar is sold, you can then buy other stuff for your 2nd Parcel.
I can only presume that the Devs made it so you can only get so much out of a parcel, maybe they can explain on this topic.
Just a tip here use around 10 buckets and shovel to put dirt in, this is a lot quicker than shovel into the Hopper.