Pretium Resources Inc. (Pretivm) reports that its 2019 deep underground exploration drilling programme confirmed expectations for Brucejack-style mineralisation and proximity to porphyry-style mineralisation at depth and to the east of the Brucejack mine, with 5.56 grams of gold per tonne intersected over 107.45 m.
Two deep holes totaling more than 3500 m were drilled toward the southeast and northeast under the Flow Dome Zone, an area approximately 1000 m east of the Brucejack mine where drilling in 2015 intersected Valley of the Kings-style high-grade gold (see news release dated October 8, 2015). Holes VU-1785 and VU-1787, both of which encountered Brucejack-style, gold-silver bearing quartz carbonate stockwork, were drilled from the eastern edge of the 1110 m level in the Valley of the Kings underground development.
Continuation of Brucejack-style mineralisation to the East
Of particular note, Hole VU-1787 intersected a zone of mineralised stockwork, including visible gold, extending over 107 m (between 198 - 305 m downhole) approximately 240 m to the east and below the eastern limit of the existing Valley of the Kings Mineral Resource.
Selected drill highlights from Hole VU-1787 include:
- 5.56 g of gold per tonne over 107.45 m (true width between 54 and 107 m) which included:
- 185.50 g of gold per tonne over 1.50 m;
- 3.05 g of gold per tonne over 0.50 m;
- 6.48 g of gold per tonne over 8.39 m, including: 28.00 g/t over 1.00 m, 10.55 g/t over 1.50 m and 6.16 g/t over 1.50 m;
- 6.41 g of gold per tonne over 19.50 m, including: 8.42 g/t over 4.50 m, and 18.34 g/t over 4.50 m;
- 4.75 g of gold per tonne over 1.50 m; and,
- 72.80 g of gold per tonne over 1.50 m.
Hole VU-1785 was drilled 2005 m to the southeast at a -65° angle, and hole VU-1787 was drilled 1536 m to the northeast at a -60° angle.
For a section view of the reported holes please see the following link: http://ml.globenewswire.com/Resource/Download/b3c64a42-5203-400d-be56-8222ffe88738.
Both holes were drilled in areas uninformed by previous drilling, confirming the potential extension of Brucejack-style mineralisation at depth and to the east of the Brucejack mine.
Exploration drilling for porphyry source
Anomalous copper and molybdenum mineralisation, indicative of a porphyry and similar to that noted in the 2018 deep exploration drilling (see news release dated 18 June 2018), was intersected at depth in both holes, extending between 1850 m and 2005 m in drill hole VU-1785 and between 1270 m and 1535 m in drill hole VU-1787. Additional geological and geochemical features, including changes in alteration, carbonate veining, pyrite zonation, and sphalerite composition, further support porphyry proximity vectoring beneath the Flow Dome Zone. Analyses of geological and geochemical samples collected from the drill core from both drill holes is in progress to further refine the vectoring process. A surface IP geophysical survey will be conducted this summer to augment the results of these analyses and generate targets for follow-up drilling, planned for 2019.
Warwick Board, Ph.D., P.Geo, Pr.Sci.Nat., Vice President, Geology and Chief Geologist, Pretium Resources Inc. is the Qualified Person (QP) responsible for the Brucejack Mine exploration drilling and has reviewed and approved the scientific and technical information in this news release relating thereto.
Regional grassroots exploration
Crews have been mobilised to site in preparation for the 2019 grassroots exploration programme on Pretivm’s Bowser Claims to follow up on the comprehensive regional exploration that has previously been completed on the 1250 km2 property that surrounds the Brucejack mine. The grassroots exploration programme includes 5000 m of regional exploration drilling set to commence in early July. In addition to drilling high-priority targets, the programme will also include: sampling, regional mapping, prospecting, airborne geophysics, ground geophysics, and hyperspectral mapping. To date, the programme has resulted in the identification of several distinct areas that have the potential to host Eskay Creek-style VMS deposits and high-grade, epithermal- related gold systems.
Kenneth C. McNaughton, M.A.Sc., P.Eng., Chief Exploration Officer, Pretium Resources Inc. is the QP responsible for the regional grassroots exploration programme and has reviewed and approved the scientific and technical information in this news release relating thereto.
Read the article online at: https://www.globalminingreview.com/exploration-development/06062019/pretium-resources-reports-brucejack-mine-drilling-results/