I made a mistake in my previous rough calculations

Tonnage Calculation
Strike Length x Depth x Width x Specific Gravity = “X” (in tonnes)
1000 x 700 x 600 x 2.5= 1,050,000,000 tons 

Total Grams Calculation
1,050,000,000 x .5 grams per ton (conservative average)  = 612,500,000 grams

612,500,000 grams / 34.2857= 17,864,590.77 oz