BLACKBIRD PGE REEFS


The Blackbird intrusion is known for its high-grade large tonnage chromite lenses. Less well known is the occurrence of PGE mineralization within the hangingwall mafic-ultramafic sequence above the upper chromite lenses (BB2-1, BB2-4) at Blackbird. Here the stratigraphy fractionates into course cycles of pyroxenite and gabbro with locally thick intersections of low-grade PGE reefs occurring at the transition (figures 1, 2). The extent and continuity of these PGE reefs has not been fully resolved as past sampling was incomplete due to the ‘no-see-em’ nature of the mineralization and focus on chromite resource definition drilling. Highlights of drill intersections into the hangingwall PGE zone are presented in the table below.

Figure 1: 3D model of the Blackbird intrusion showing PGE intersections in the hangingwall above the BB2-1 and BB2-4 chromite lenses.

Figure 1: 3D model of the Blackbird intrusion showing PGE intersections in the hangingwall above the BB2-1 and BB2-4 chromite lenses.


Figure 2: geochemical profile through NOT-09-1G087 showing location of PGE reef at transition from pyroxenite to gabbro in the hangingwall sequence above BB2-4 chromite lens (stratigraphic facing is down hole).

Figure 2: geochemical profile through NOT-09-1G087 showing location of PGE reef at transition from pyroxenite to gabbro in the hangingwall sequence above BB2-4 chromite lens (stratigraphic facing is down hole).

A program is being planned to fully sample and re-log these hangingwall intervals to better determine the grade, thickness and continuity of the PGE reefs in the hangingwall to Blackbird chromite mineralization.

DDH From (m) To (m) Width (m) Pt (g/t) Pd (g/t) PGE (g/t)
NOT-08-1G063 313.5 316.0 2.5 0.7 0.3 1.0
NOT-08-1G063 379.5 398.8 19.3 0.3 0.7 1.0
NOT-08-1G065 490.5 526.5 36.0 0.7 0.3 1.0
NOT-08-1G067 257.0 264.0 7.0 0.2 0.6 0.8
NOT-09-1G087 136.5 147.0 10.5 0.6 0.2 0.8
NOT-09-1G088 168.0 171.0 3.0 0.5 0.2 0.7
NOT-09-1G088 176.0 179.0 3.0 0.4 0.1 0.5
NOT-09-1G088 191.5 195.0 3.5 0.6 0.2 0.8
NOT-09-1G093 184.0 188.0 4.0 0.4 0.4 0.8
NOT-09-1G093 196.5 200.0 3.5 0.5 0.5 1.0
NOT-09-1G093 211.0 215.5 4.5 0.6 0.3 0.9
NOT-09-1G130 167.2 168.8 1.6 0.5 2.2 2.7
NOT-09-1G170 268.9 273.3 4.4 0.6 0.2 0.8
NOT-09-1G170 287.6 289.0 1.4 0.3 2.4 2.7
NOT-09-1G175 172.4 193.8 21.3 0.3 0.2 0.5
NOT-11-1G206 309.0 312.3 3.3 0.4 1.0 1.4
NOT-11-1G218 320.4 328.0 7.6 0.4 0.2 0.6
NOT-11-1G218 339.0 342.0 3.0 0.5 0.2 0.7
NOT-11-1G218 443.0 447.0 4.0 0.2 0.6 0.8
norontresourceBlackbird PGE Reefs