You forgot about Magnesium ...
http://www.globenewswire.com/news-release/2020/12/02/2138722/0/en/Noront-Announces-Results-of-Metallurgical-Test-Work-for-Eagle-s-Nest-and-Reports-Test-Drilling-Assays.html
Test work with open circuits on the 83:17 blend was done to refine the flow sheet and produce an improved bulk concentrate process. XPS then moved on to locked-cycle tests with the new 83:17 composite to produce a bulk concentrate and then separate nickel and copper concentrates. The bulk concentrate circuit produced stable results and yielded recoveries of 91.8% Cu, 83.1% Ni, 81.8% Co, 72.6% Ag, 86.1% Au, 85.0% Pd and 76.8% Pt into a bulk concentrate with 5.1% Cu, 9.7% Ni and 31.1% S (Table 3). Importantly, the magnesium level of the bulk concentrate was 4.3% MgO