I have no clue. I'm not sure what your actually looking for...But I'm going to take a try at it...
spot is about $1254.40 right now.
About $26.88 per square foot...
$35 divided by .75 = 46.66 (parts of Gold per SQ FT )... 1254.40 divided by 46.667= 26.88
Hopefully, if I did that wrong someone will chime in....I think I did it right. It's been a while and I'm a little rusty. I'm using the same type of thinking along the lines of scrap. I've never had to figure gold in the ground...I'm guessing it's the same idea..