Please don`t take this the wrong way....I didn`t question your determination or knowledge, or skill as that matter....
As I said....You have very good material... it means very valuable...but all in its own category....to even consider making an assumption upon what that amount will yield you....you have to organize every bit of material, parts, ic, capacitors...and so on , then sample each type of material separately....then you can make a pretty accurate assumption of the whole lot.
If you have done that, you already know what the whole lot is worth (in gold), then you can decide to recover it yourself or take to a smelter or sell it as it is....until that, the yield is just a guess, nothing more....
E-scrap can be defying, since the same type of component on the same board next to each other but from different manufacturers will already yield you different amounts....how can you estimate that? This happens also with the same manufacturer but different production years.
Its a tricky business....I`we learned it the hard way....
Whatever you decide to do with it....we will help you on the way....but be prepared to invest in your and your surroundings safety.....that is the most important thing before starting anything...
Be safe,
Pete