Grade is king.... always GB-23-12, which cut 25.42 metres grading 5.51 per cent copper (Cu) is considered to be near the core of the high-grade lens, which is the deepest high-grade drill intersection on the Great Burnt deposit to date. An interval within this zone returned 8.77 per cent Cu, 4.43 grams per tonne (g/t) gold (Au), 82 g/t silver (Ag) and 1.12 per cent zinc (Zn) over one m. In addition, GB-23-13 and GB-23-14 also intersected the copper-rich zone, which is believed to be the up-dip and down-dip extension of the lens. Please see the attached summary table for the complete results to date.
https://www.mining.com/the-worlds-top-10-highest-grade-copper-mines/