Brendon
There are a number of tracks leading to locked gates, which is as far as you can go without explicit permission. The gates correspond with the boundaries of the Crown Land. Remember the Crown Land is under a grazing lease, and prospecting is possible by virtue of the good offices of the lease holder.
You can see the tracks on Google Earth or Google Maps satellite view, and the tracks give access to the creek at a number of locations generally downstream of the camping area.
All prospecting activity should observe normal good practice and courtesy in relation to the lease holder. IE fill in your holes, leave unlocked gates as you found them, and say good day to the farmer and express your appreciation when you see him. Don't camp over the other side of the creek, don't leave rubbish lying about, and make sure you patronise the store.