pyriteIt appears pyrite is consistently associated with the gold-copper-silver mineralization encountered in all the holes drilled at the Black Dog discovery to date. There is something exciting going on in the Trove vicinity, but the mention of pyrite is a normal occurrence and shouldn't be the major reason for excitement.
https://www.osiskomining.com/news/index.php?&content_id=196 Osisko Expands Black Dog Au-Ag-Cu Discovery
3.90 g/t Au Over 6.3 Metres Intersected 650 Metres East of Discovery Hole
Montral, January 18, 2017). Osisko Mining Inc. (OSK:TSX, "Osisko" or the "Corporation") is pleased to announce new drill results from its 100% owned Black Dog gold-silver-copper discovery located in Barry Township, Qubec, 15 kilometres southwest of Osisko’s flagship Windfall Lake gold deposit. Drilling is targeting extensions of the Black Dog discovery and nearby anomalies identified by an airborne geophysical survey conducted by Osisko in 2016. The discovery coincides with magnetic and electromagnetic anomalies that are associated with breccia-hosted quartz-tourmaline mineralization and alteration, with disseminated to semi-massive Au-Ag-Cu bearing sulfides. Analytical results from three new intersections at Black Dog are reported below (OSK-BD-16-006, -007, -011); previously reported results from the discovery holes (OSK-BD-16-001 and OSK-BD-002) are provided for reference.
Highlights of Exploration Results at the Developing Black Dog Discovery
- Discovery hole OSK-BD-16-002 (previously reported) intersected 3.42 g/t Au, 23.2 g/t Ag, 0.65% Cu over 32.1 metres (including 6.14 g/t Au, 34.1 g/t Ag, 0.95% Cu over 14.4 metres).
- Discovery area is presently defined by five intersections in four separate locations along approximately 1200 metres of a NE-trending linear magnetic structure; mineralization centres occur as tabular breccia zones interpreted to be disconnected laterally at surface.
- New intercept in OSK-BD-16-006 averaged 3.90 g/t Au over 6.3 metres, 650 metres east of the discovery hole
- New intercept OSK-BD-16-011 averaged 5.69 g/t Au, 47.5 g/t Ag, 1.87 % Cu over 2.7 metres 50 metres west of the discovery hole.
- Borehole electromagnetic geophysics surveys in holes OSK-BD-16-003 and -005 indicate the presence of two off-hole conductors located below and to the east of these holes; anomalies are located 1500 metres east of the discovery hole and will be drilled in the coming month.
| Drill Hole | From
(m) | To
(m) | Interval
(m) | Au (g/t) | Ag (g/t) | Cu (%) | Zone |
| OSK-BD-16-001 | 199.9 | 200.8 | 0.9 | 5.76 | 34.8 | 0.71 | Black Dog |
| OSK-BD-16-002 | 93.2 | 125.3 | 32.1 | 3.42 | 23.2 | 0.65 | Black Dog |
| including | 97.2 | 111.6 | 14.4 | 6.14 | 34.1 | 0.95 | Black Dog |
| including | 97.2 | 100.0 | 2.8 | 15.6 | 93.5 | 3.29 | Black Dog |
| OSK-BD-16-006 | 359.9 | 366.2 | 6.3 | 3.90 | 7.54 | 0.09 | Black Dog |
| including | 359.9 | 362.0 | 2.1 | 7.10 | 17.27 | 0.19 | Black Dog |
| OSK-BD-16-007 | 608.6 | 610.6 | 2.0 | 4.69 | 12.19 | 0.33 | Black Dog |
| including | 609.0 | 609.9 | 0.9 | 8.34 | 17.19 | 0.46 | Black Dog |
| OSK-BD-16-011 | 107.3 | 110.0 | 2.7 | 5.69 | 47.5 | 1.87 | Black Dog |
Notes: True Widths of breccias are not known. See “Quality Control” below.
Further drilling is currently in progress and is directed at determining the extent, continuity and geometry of the new polymetallic gold mineralization discovered at Black Dog. Further downhole electromagnetic (EM) surveys are planned to assist in targeting, and a second drill rig will be assigned to the project in the coming month.
Maps and sections showing the location of the holes presented in this news release and full analytical results are available at www.osiskomining.com.
| Hole Number | Azimuth (°) | Dip (°) | Length (m) | UTM E | UTM N |
| OSK-BD-16-001 | 330 | -56 | 288.0 | 441704 | 5422936 |
| OSK-BD-16-002 | 332 | -61 | 196.5 | 442131 | 5423313 |
| OSK-BD-16-003 | 328 | -61 | 295.5 | 443063 | 5423732 |
| OSK-BD-16-004 | 330 | -62 | 60.5 | 443164 | 5423726 |
| OSK-BD-16-005 | 330 | -65 | 340.5 | 443164 | 5423727 |
| OSK-BD-16-006 | 327 | -60 | 547.5 | 442824 | 5423368 |
| OSK-BD-16-007 | 326 | -60 | 724.5 | 442802 | 5432044 |
| OSK-BD-16-008 | 326 | -60 | 700.5 | 442617 | 5422925 |
| OSK-BD-16-009 | 331 | -62 | 289.5 | 441305 | 5422684 |
| OSK-BD-16-010 | 328 | -65 | 608.0 | 441186 | 5422261 |
| OSK-BD-16-011 | 295 | -45 | 199.5 | 442131 | 5423312 |
OSK-BD-16-006 targeted an EM anomaly 650 metres east of the discovery hole. The hole intersected 3.90 g/t Au and 7.54 g/t Ag over 6.3 metres (including 7.10 g/t Au and 17.27 g/t Ag over 2.1 metres) in a tourmaline altered and garnet-bearing volcanic flow containing up to 10% pyrite with traces of sphalerite and chalcopyrite.
OSK-BD-16-007 targeted an EM anomaly 630 metres ESE of the discovery hole, intersecting 4.69 g/t Au and 12.19 g/t Ag over 2.0 metres, hosted in an altered andesite with tourmaline veining containing 5-10% pyrite with minor chalcopyrite and sphalerite.
OSK-BD-16-008 was collared 620 metres southeast of the discovery hole to test the interpreted down-plunge extension of the tourmaline/sulphide breccia. The hole intersected 21.0 metres of tourmaline breccia containing 3-10% pyrite, but returned no significant gold values. However, the hole demonstrates the mineralized breccia column has a down-plunge extension of at least 500 metres.
OSK-BD-16-011 targeted the immediate western extension of the discovery zone (50 metres west). The hole intersected 5.69 g/t Au, 47.5 g/t Ag, and 1.87% Cu over 2.7 metres in a tourmaline and sulfide breccia containing 10-90% pyrite and up to 15% chalcopyrite. The two intervals (OSK-BD-16-002 and OSK-BD-011) correspond to a borehole electromagnetic anomaly extending below the holes.
OSK-BD-16-003, -004, and -005 were drilled 1 kilometre to the ENE of the discovery zone and intersected volcanic rocks strongly altered with tourmaline. OSK-BD-16-004 was abandoned at shallow depth, and no significant results were encountered in OSK-BD-16-003 and -005. OSK-BD-16-009 and -010 were drilled on geophysical targets approximately 1 kilometre and 1.4 kilometres (respectively) from the discovery hole. Both holes encountered zones containing up to 5-6% pyrite mineralization with associated bleaching and silicification. Analytical results from these holes are pending.