Midnight Sun Drills 4.23% Copper Equivalent Over 11.6 Meters
Vancouver, July 4, 2017 - Midnight Sun Mining Corp. (TSXV: MMA) is (the "Company" or "Midnight Sun") pleased to announce initial assay results from its spring 2017 Mitu drill program. The focus of this drill campaign was to expand and further define the extent of the previously announced ore-shale type copper-cobalt discovery at the Mitu area of the Solwezi Properties, Zambia (see news release dated January 12, 2017). Drill hole MDD-17-15 stepped out 3.72 kilometers ("km") southeast from discovery hole MDD-16-01, and reported 3.44% copper, 0.067% cobalt, 0.058% nickel and 331 parts per billion ("ppb") gold (4.23% copper equivalent) over 11.6 meters ("m"). "This was an ambitious program, with wide step out holes both along strike and down dip from known mineralization. Our aggressiveness was rewarded with the best hole we have drilled to date." said Robert Sibthorpe, President and CEO. "The fact that we continue to encounter strong copper and significant cobalt reinforces our belief that Mitu is worthy of our excitement. With the advancement in prices and increase in demand for cobalt, this project appears to be as important a cobalt discovery as it is a copper one."
The results from the first eight diamond drill holes received as well as significant results from Air Core drilling are presented in the Table below.
| Hole # | Type | Dip | Azi | EOH (m) | From (m) | To (m) | Interval (m) | True (m) | Copper % | Cobalt % | Nickel % | Au ppb | Cu Eq (%) |
| MDD-17-15 | Diamond | 60 | 30 | 200.7 | 151.6 | 163.2 | 11.6 | 11.6 | 3.44 | 0.067 | 0.058 | 331 | 4.23 |
| MDD-17-01 including and including | Diamond | vertical | 0 | 168.0 | 21.3 21.3 149.9 149.9 | 52.0 38.8 165.0 157.9 | 30.7 17.5 15.1 8.0 | 27.6 15.8 13.6 7.2 | 0.26 0.33 0.59 0.89 | 0.038 0.057 0.131 0.174 | 0.058 0.070 0.053 0.057 | Pending | 0.76* 1.04* 2.02 2.78 |
| MDD-17-04 including | Diamond | 50 | 360 | 179.8 | 128.3 133.2 | 156.5 142.2 | 28.2 9.0 | 28.2 9.0 | 0.40 0.70 | 0.023 0.019 | 0.020 0.022 | Pending | 0.68 0.92 |
| MDD-17-06 | Diamond | vertical | 0 | 161.9 | 31.2 | 37.2 | 6.0 | 5.4 | 0.22 | 0.027 | 0.069 | Pending | 0.61* |
| MDD-17-03 | Diamond | vertical | 0 | 164.8 | 140.9 | 154.5 | 13.6 | 12.2 | 0.28 | 0.017 | 0.029 | Pending | 0.50 |
| MDD-17-07 | Diamond | vertical | 0 | 230.8 | 152.9 | 188.9 | 36.0 | 32.4 | 0.20 | 0.016 | 0.018 | Pending | 0.40 |
| MDD-17-05 | Diamond | vertical | 0 | 231.0 | 148.9 | 158.6 | 9.7 | 8.7 | 0.23 | 0.013 | 0.016 | Pending | 0.36 |
| MAC-17-19 including | Air Core | vertical | 0 | 60.5 | 15.0 31.5 | 60.5 60.5 | 45.5 29.0 | 45.5 29.0 | 0.52 0.72 | 0.033 0.047 | 0.041 0.047 | Pending | 0.85* 1.22* |
| MAC-17-13 | Air Core | vertical | 0 | 37.5 | 16.5 | 36.0 | 19.5 | 19.5 | 0.32 | 0.023 | 0.037 | Pending | 0.60* |
Notes;
- MDD-17-02 did not report any significant results.
- True widths were estimated using cross-section analysis.
- Copper equivalents were calculated using current metal price ratios and are presented only for ease of interval comparison. Recovery factors were assumed at 100% although the recovery factor for various metals may vary significantly. Metal prices used were $2.54/lb copper, $26.54/lb cobalt, $4.03/lb nickel and $1251/oz gold.
- *Denotes near surface oxide mineralization.
To date, the 2017 work program at Mitu has comprised 37 line-km of natural source audio magneto tellurics ("NSAMT") geophysical surveying, air core and diamond drilling, and soil sampling. The NSAMT survey indicated the presence of a conductive anomaly over a strike length of approximately 17 km. This conductive anomaly is believed to be associated with ore-shale, the typical host rock for copper mineralization in the Zambia-Congo Copperbelt. Midnight Sun has taken 648 in-fill and step-out soil samples and First Quantum Minerals has continued soil sampling and geochemical work covering the Solwezi Properties as part of a larger regional program, of which the results are reported to Midnight Sun on a timely basis (see news release dated August 18, 2016). Prior to diamond drilling, using air core drills, the Company drilled 4,755 m in 119 shallow drill holes to bedrock for indications of ore-shale covering the conductive anomaly indicated by the geophysical survey. This air core drilling confirmed the ore-shale's correlation to the geophysical anomaly, extending the known strike length by more than 10 km, and assisted in collaring the diamond drill holes.
Qualified Control/Quality Assurance: Samples obtained during both core and AC drilling were transported directly to Genalysis Laboratory Services in Chingola, Zambia by Midnight Sun personnel for sample preparation. Samples were sorted, dried, crushed, and pulped before being sent to Perth, Australia for final chemical analysis using ICP-OE methods. All samples returning >10,000 ppm Cu were automatically re-checked by Genalysis which is a fully accredited laboratory. Standards and blanks were inserted regularly in the sample stream and checks were done for Au and Cu.
Qualified Person: Shastri Ramnath, P.Geo, a Qualified Person under NI 43-101, has reviewed and approved the technical data and contents of this release.
ON BEHALF OF THE BOARD
Robert Sibthorpe B.Sc.(Geology), M.B.A.
President & CEO
For Further Information Contact:
Al Fabbro
Director
Tel: 604-351-8850
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