I think what you mentioned is very good.
If it's soft digging, it could be a recent patch of flood gold. You with eyes on the area are in the best position to decide if it is or not. You could pan the area to see how long this streak runs. The next step would be to see how much material is in the streak, and that's running buckets of material.
Someone mentioned the gold cube. I want to talk about my experiences sampling with the gold cube. I dug 10 five gallon buckets (a quarter ton) classified to 8 mesh, for my gold cube and it took an entire day. I actually ran it the following day.
My experiences in classifying to get 8 mesh for the gold cube is it's a lot of work. In my local area in Central AZ, when I classify, each step lower I go, I need to get two buckets of the larger material to make one. So to get one bucket of 8 mesh, I need to dig 8 buckets of material and classify it. So if I classify to a half inch in a five gallon bucket, I need 8 buckets of dug material which gets me 4 buckets of 1/2 inch classified material. I take these four buckets and classify through a quarter inch classifier and I get two buckets of a quarter inch. I take these two buckets of quarter inch through an 8 mesh classifier, and get to an eighth inch to run through the cube.
If you took 40 five gallon buckets, which is a little more than a ton of material, classified it to 8 mesh material, now you get a good idea of how many ounces per ton, or more likely grams per ton your paystreak is worth.