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Pretivm’s Valley of the Kings Shaping Up

In the end the “cleaned up” drill results still look reasonably good. Of the 64 published intervals, 35 of them grade higher than the average grade of 13.6 g/t used in their probable resource calculations for this zone.

Disclaimer: This is an editorial review of a public press release and not an endorsement. It may include opinions or points of view that may not be shared by the companies mentioned in the release. The editorial comments are highlighted so as to be easily separated from the release text and portions of the release not affecting this review may be deleted. Please view the full release here.
VANCOUVER, BRITISH COLUMBIA–(Marketwired – Sept. 23, 2013) – Pretium Resources Inc. (TSX:PVG)(NYSE:PVG) (“Pretivm”) is pleased to report additional underground drill results from the Valley of the Kings Bulk Sample Program (the “Program”) currently underway, as well as additional exploration drilling in the Valley of the Kings extending beyond the area of the Program. Assays from both Program and non-Program exploration underground drilling continue to confirm the projection of high-grade gold mineralized domains, with numerous intersections encountering gold grading over 1,000 grams per tonne. (See Table 1 below for assays.)
Read more about the Brucejack Project here.

Selected drill highlights include:

  • Hole VU-201 (Exploration hole) intersected 6,550 grams of gold uncut over 0.50 meters;
  • Hole VU-219 (Program hole) intersected 698 grams of gold uncut over 2.97 meters including 2,340 grams of gold uncut over 0.50 meters and 1,805 grams of gold uncut over 0.50 meters;
  • Hole VU-221 (Program hole) intersected 66 grams of gold uncut over 13.00 meters including 1,675 grams of gold uncut over 0.50 meters;
  • Hole VU-239 (Exploration hole partially intersecting Cleopatra Vein) intersected 195 grams of gold per tonne uncut over 9.29 meters including 2,140 grams of gold uncut over 0.50 meters and 1,425 grams of gold uncut over 0.50 meters.
Normally assays are “cut” as part of a QA/QC program in order to remove outliers from the geochemical data. Essentially the maximum reportable grade is capped at a certain level. The rationale is that if a value is too high, it may skew the overall grade averages resulting in inaccurate results. Pretivm has capped the results at 430 g/t, but has reported these very high uncut results.

Epithermal gold deposits are typically high grade, low tonnage deposits with gold concentrated in narrow veins. Aside from having a really cool name, Brucejack’s “Valley of the Kings” zone appears to consist of epithermal-style high grade veining. It is likely that the reported uncut results are drill intersections of these high grade veins.

Seven high-grade gold intersections in the latest results exceed 1,000 grams per tonne, including one intersection of the Cleopatra Vein (the 2,140 grams per tonne gold intersection uncut from hole VU-239 noted above). Hole VU-201 noted above was drilled as an exploration hole from the 426622.5E drill bay to the north.

Bulk Sample Program

Assay results have been received and reported for 15 of the 17 planned drill fans. A total of 186 drill holes have now been completed or in progress comprising approximately 15,418 meters. Approximately 16,500 meters of underground drilling in 202 holes will be completed as part of the Program, which is expected to conclude in September. The final fan of the underground drilling included in the Program is in progress and expected to be completed this month.

For cross sections and plan views of the currently reported drilling please visit the following link – http://media3.marketwire.com/docs/pvg923_F1-4.pdf.

We have included one of the plan view drawings below. Underground development has already commenced at Brucejack. Bulk sampling and mill testing will (hopefully) confirm the ore grades from drill results and prove up the economics.
Plan view of the Brucejack project drilling to date including completed underground development and completed bulk sample locations.

Plan view of the Brucejack project drilling to date including completed underground development and completed bulk sample locations.

The 10,000 tonnes of bulk sample material has been transported offsite. Approximately 6,000 tonnes of bulk sample material will have arrived at the mill by the end of this week with the remaining material scheduled to arrive by the end of October. Milling of the bulk sample material will commence later this week.

Strathcona Mineral Services Ltd. (“Strathcona”) has been engaged as the independent Qualified Person to oversee and report on the 10,000-tonne bulk sample for the Program.

The 1345-meter level, centered at the 426600E cross-section of the Valley of the Kings, was selected as the bulk sample location based on Strathcona’s requirements that the bulk sample be excavated from an area representative of the (a) drillhole density that informs the Indicated Mineral Resource, (b) average grade of the Indicated Mineral Resource and the global resource for the Valley of the Kings, (c) proportion of low-grade, high-grade and extreme grade populations in the overall Indicated Mineral Resource and (d) style of stockwork gold mineralization characteristic of the Valley of the Kings.

It is worth noting that in the 1990’s underground development was completed down to the 1100 level, though the mine was never opened. The plan view shown above is centered on the 1300 level and was selected for bulk sampling as being characteristic of the zone.  

Additional Underground and Surface Exploration

Excavation of a drift along the recently-discovered high-grade Cleopatra Vein in the Valley of the Kings has been completed, with two raises on Cleopatra underway. Cleopatra has been defined for approximately 85 meters along strike, 50 meters above the 1345-meter level, 50 meters below the 1345-level and remains open in all directions. Additional drifting and cross-cutting has been completed in two areas: to the west of the bulk sample location, and to the north and east on Domain 20. Planning is underway for additional drifting.

Underground exploration drilling is currently testing high-grade mineralization to the west, east and below the bulk sample location. Approximately 13,500 meters of underground exploration drilling is expected to be completed in addition to the 16,500 meters of drilling included in the Program, with approximately 12,000 meters of underground exploration drilling completed to date.

The surface drill program at the Valley of the Kings is underway with two drills on-site and targeting high-grade mineralization in the Valley of the Kings to the east of the bulk sample location. A total of 5,000 meters is currently planned for the surface drill program.

Program Reporting

Assay results for completed fans from the underground drilling will be reported as they are received. Due to the projected time to complete assaying of the samples from the sample tower, Strathcona’s report on the Program is now expected early in 2014 after compilation of all data. The amount of gold and silver produced by the mill will be reported as milling of the bulk sample progresses.

Feasibility Study Update

The Brucejack Project Feasibility Study (see news release dated June 11, 2013), and associated mine plan and Mineral Reserves, will be updated following the completion of an updated Mineral Resource estimate for the Valley of the Kings. The updated Mineral Resource estimate for the Valley of the Kings will incorporate all 2013 underground and surface drilling and will be prepared following receipt of all assays for the 2013 drill program.

View the full published drill results in here.

View the full published drill results in here.

Table 1: Valley of the Kings Drill Results, September 2013 (VU-201 to VU-249)(1,2,3)
HoleNo. Dip/Azimuth From(meters) To(meters) Interval(meters) Gold(g/t) Silver(g/t) Capping
Bulk Sample Drill Fan Section 426546.75E (360 Azimuth)
VU-209 64/360 42.00 52.50 10.50 1.65 5.80
VU-210 53/360 6.85 22.08 15.23 14.34 13.29
15.63 16.13 0.50 395.00 215.00
VU-212 45/360 8.00 11.15 3.15 9.34 9.47
VU-215 34/360 24.00 27.10 3.10 6.29 9.03
incl 24.60 25.20 0.60 20.30 12.30
53.55 54.05 0.50 16.85 6.60
VU-216 18/360 9.00 16.60 7.60 6.16 45.74
incl 16.10 16.60 0.50 66.90 62.80
34.50 35.00 0.50 23.10 9.30
50.45 50.90 0.45 19.25 13.90
VU-217 -1/360 40.94 43.80 2.86 32.16 35.28
incl 40.94 41.44 0.50 156.50 176.00
VU-219 -19.5/360 42.30 45.27 2.97 145.04 289.70 2 Au samples cut
or 42.30 45.27 2.97 698.07 289.70 Uncut
incl 42.30 42.80 0.50 1,805 907.00 Uncut
incl 44.77 45.27 0.50 2,340 792.00
VU-221 -34.5/360 20.40 33.40 13.00 18.25 58.88 1 Au sample cut
or 20.40 33.40 13.00 66.14 58.88 Uncut
incl 20.40 20.90 0.50 22.50 62.20
incl 32.26 32.76 0.50 1,675 1,260 Uncut
VU-222 -46/360 12.10 21.85 9.75 8.64 8.89
incl 12.10 12.60 0.50 25.60 6.00
incl 20.25 20.75 0.50 104.00 88.00
VU-224 -54/360 17.50 25.50 8.00 1.08 9.71
VU-225 -64/360 29.00 39.50 10.50 1.02 2.79
49.78 50.40 0.62 20.80 13.90
Bulk Sample Drill Fan Section 426562.5E (360 Azimuth)
VU-228 -1/360 2.00 12.60 10.60 1.38 7.64
VU-231 18/360 7.00 11.00 4.00 10.82 13.10
incl 9.86 10.36 0.50 78.20 51.10
46.00 47.00 1.00 142.07 94.60
incl 46.00 46.50 0.50 279.00 185.00
VU-232 33.5/360 36.50 43.00 6.50 1.35 7.89
VU-234 45/360 8.60 12.34 3.74 6.79 12.53
60.83 61.33 0.50 44.40 24.30
68.60 69.35 0.75 51.30 49.80
VU-236 53.5/360 1.00 1.50 0.50 29.10 7.00
38.40 39.00 0.60 43.30 27.30
VU-238 64/360 47.50 57.90 10.40 1.60 4.32
VU-240 -19.5/360 44.83 48.90 4.07 43.36 33.57
incl 44.83 45.33 0.50 246.00 147.00
incl 48.40 48.90 0.50 99.40 88.30
VU-242 -34.5/360 1.80 24.80 23.00 1.37 6.83
VU-244 -46/360 0.50 15.60 15.10 1.32 5.98
20.90 28.40 7.50 1.34 21.06
VU-246 -54/360 0.93 10.10 9.17 9.58 11.45
incl 0.93 1.43 0.50 68.30 33.40
incl 8.60 9.10 0.50 83.20 94.00
42.71 43.21 0.50 936.00 589.00 Uncut
VU-248 -64.5/360 2.00 29.00 27.00 1.16 2.84
Exploration Drilling from Drill Bay 426571E/6258005N Testing Cleopatra
VU-200 19/90 52.10 60.50 8.40 24.57 23.04
58.75 59.25 0.50 386.00 315.00
VU-202 31/90 62.50 66.00 3.50 3.29 6.13
VU-203 40/90 69.50 70.00 0.50 3.47 11.60
VU-206 -31/90 61.00 61.60 0.60 128.00 64.30
VU-207 -40/90 60.00 63.00 3.00 10.21 10.82
incl 60.00 60.50 0.50 56.40 27.00
VU-208 -50/90 23.85 24.35 0.50 32.90 22.90
80.00 80.50 0.50 18.05 20.90
97.00 104.25 7.25 20.39 99.38
incl 103.75 104.25 0.50 287.00 310.00
Exploration Drilling from Drill Bay 426622E/6257934N Testing to the North
VU-201 14/16 39.50 49.50 10.00 26.53 202.72 1 Au sample cut
or 39.50 49.50 10.00 332.53 202.72 Uncut
incl 39.50 40.10 0.60 33.60 48.30
incl 42.60 43.10 0.50 22.30 202.00
incl 48.20 48.70 0.50 6,550 3,510 Uncut
VU-204 -14/16 26.40 37.83 11.43 30.09 29.29 1 Au sample cut
26.40 37.83 11.43 36.38 29.29 Uncut
26.85 27.35 0.50 244.00 196.00
37.33 37.83 0.50 574.00 435.00 Uncut
52.94 53.44 0.50 213.00 230.00
70.52 71.03 0.51 83.80 77.00
Exploration Drilling from Drill Bay 426611E/6258037N Testing Domain 20
VU-213 41/34 52.10 59.00 6.90 2.05 45.97
incl 57.50 58.00 0.50 12.85 291.00
VU-218 1/85 32.50 41.40 8.90 0.98 7.79
VU-220 27.5/85 94.80 97.55 2.75 4.42 55.11
VU-223 -53/85 23.00 31.25 8.25 5.76 27.21
incl 30.75 31.25 0.50 79.20 22.20
VU-226 -65/122 55.50 63.30 7.80 4.49 130.21
incl 55.50 55.95 0.45 38.50 113.00
VU-229 26/104 28.00 28.50 0.50 330.00 207.00
VU-230 50/104 39.00 41.05 2.05 8.52 10.55
incl 40.55 41.05 0.50 27.70 20.30
VU-233 -54/104 36.50 43.00 6.50 2.33 21.32
Exploration Drilling from Drill Bay 426570E/6258005N Testing Cleopatra
VU-235 46/126 29.60 42.66 13.06 18.14 28.52 1 Au sample cut
or 29.60 42.66 13.06 45.51 28.52 Uncut
incl 29.60 30.10 0.50 25.50 16.90
incl 42.16 42.66 0.50 1,145 618.00 Uncut
VU-237 34/126 60.00 61.50 1.50 58.90 84.20
VU-239 -40/126 10.50 12.00 1.50 49.90 51.60
53.31 62.60 9.29 49.53 118.11 2 Au samples cut
or 53.31 62.60 9.29 195.12 118.11 Uncut
incl 53.31 53.81 0.50 1,425 875.00 Uncut
incl 61.40 62.10 0.70 37.30 43.90
incl 62.10 62.60 0.50 2,140 1,210 Uncut
VU-241 44/98 64.50 73.50 9.00 1.47 3.20
VU-245 -13/136 64.46 67.00 2.54 105.26 77.12
incl 64.46 64.96 0.50 213.00 158.00
incl 64.96 65.56 0.60 23.80 37.80
incl 65.56 66.06 0.50 252.00 148.00
incl 66.06 67.00 0.94 21.90 21.50
VU-247 -24/136 33.77 49.68 15.91 20.21 25.06 1 Au sample cut
or 33.77 49.68 15.91 37.06 25.06 Uncut
incl 33.77 34.27 0.50 966.00 482.00 Uncut
incl 49.19 49.68 0.49 183.00 104.00
63.62 64.12 0.50 76.20 92.10
80.14 80.64 0.50 75.30 49.00
VU-249 -34/136 33.43 37.12 3.69 6.88 9.18
incl 33.43 33.93 0.50 24.70 18.30
(1) True thickness to be determined.
(2) Unless otherwise indicated as uncut, all gold assays over 430 g/t were cut to 430 g/t.
(3) All samples were submitted for preparation and analysis by ALS Chemex at its facilities in Terrace, B.C. All samples were analyzed using multi-digestion with ICP finish and fire assay with AA finish for gold. Samples over 100 ppm silver were reanalyzed using four acid digestion with an ore grade AA finish. Samples over 1,500 ppm silver were fire assayed with a gravimetric finish. Samples with over 10 ppm gold were fire assayed with a gravimetric finish. One in 20 samples was blank, one in 20 was a standard sample, and differing one in 20 samples was a field duplicate one-quarter split core assayed at ALS Chemex in Vancouver, B.C.
Normally we scratch out the “including” grades from the drill results as they distract from the big picture, but this time we’ll just delete them long with the uncut results and see what’s left. It might be a little unfair to remove the uncut grades since they likely represent high grade veins, but let’s stick with it anyway. In the end the “cleaned up” drill results still look quite good. Of the 64 published intervals, 35 of them grade higher than the average grade of 13.6 g/t used in their probable resource calculations for this zone. If you look at the results in terms of average grade per meter (without the uncut results) the result is 15.45 g/t gold – which is still good and still higher than their resource average. 
Table 1: Valley of the Kings Drill Results, September 2013 (VU-201 to VU-249)(1,2,3)
HoleNo. Dip/Azimuth From(meters) To(meters) Interval(meters) Gold(g/t) Silver(g/t) Capping
VU-209 64/360 42.00 52.50 10.50 1.65 5.80
VU-210 53/360 6.85 22.08 15.23 14.34 13.29
15.63 16.13 0.50 395.00 215.00
VU-212 45/360 8.00 11.15 3.15 9.34 9.47
VU-215 34/360 24.00 27.10 3.10 6.29 9.03
53.55 54.05 0.50 16.85 6.60
VU-216 18/360 9.00 16.60 7.60 6.16 45.74
34.50 35.00 0.50 23.10 9.30
50.45 50.90 0.45 19.25 13.90
VU-217 -1/360 40.94 43.80 2.86 32.16 35.28
VU-219 -19.5/360 42.30 45.27 2.97 145.04 289.70 2 Au samples cut
VU-221 -34.5/360 20.40 33.40 13.00 18.25 58.88 1 Au sample cut
VU-222 -46/360 12.10 21.85 9.75 8.64 8.89
VU-224 -54/360 17.50 25.50 8.00 1.08 9.71
VU-225 -64/360 29.00 39.50 10.50 1.02 2.79
49.78 50.40 0.62 20.80 13.90
VU-228 -1/360 2.00 12.60 10.60 1.38 7.64
VU-231 18/360 7.00 11.00 4.00 10.82 13.10
46.00 47.00 1.00 142.07 94.60
VU-232 33.5/360 36.50 43.00 6.50 1.35 7.89
VU-234 45/360 8.60 12.34 3.74 6.79 12.53
60.83 61.33 0.50 44.40 24.30
68.60 69.35 0.75 51.30 49.80
VU-236 53.5/360 1.00 1.50 0.50 29.10 7.00
38.40 39.00 0.60 43.30 27.30
VU-238 64/360 47.50 57.90 10.40 1.60 4.32
VU-240 -19.5/360 44.83 48.90 4.07 43.36 33.57
VU-242 -34.5/360 1.80 24.80 23.00 1.37 6.83
VU-244 -46/360 0.50 15.60 15.10 1.32 5.98
20.90 28.40 7.50 1.34 21.06
VU-246 -54/360 0.93 10.10 9.17 9.58 11.45
VU-248 -64.5/360 2.00 29.00 27.00 1.16 2.84
VU-200 19/90 52.10 60.50 8.40 24.57 23.04
58.75 59.25 0.50 386.00 315.00
VU-202 31/90 62.50 66.00 3.50 3.29 6.13
VU-203 40/90 69.50 70.00 0.50 3.47 11.60
VU-206 -31/90 61.00 61.60 0.60 128.00 64.30
VU-207 -40/90 60.00 63.00 3.00 10.21 10.82
VU-208 -50/90 23.85 24.35 0.50 32.90 22.90
80.00 80.50 0.50 18.05 20.90
97.00 104.25 7.25 20.39 99.38
VU-201 14/16 39.50 49.50 10.00 26.53 202.72 1 Au sample cut
VU-204 -14/16 26.40 37.83 11.43 30.09 29.29 1 Au sample cut
26.85 27.35 0.50 244.00 196.00
52.94 53.44 0.50 213.00 230.00
70.52 71.03 0.51 83.80 77.00
VU-213 41/34 52.10 59.00 6.90 2.05 45.97
VU-218 1/85 32.50 41.40 8.90 0.98 7.79
VU-220 27.5/85 94.80 97.55 2.75 4.42 55.11
VU-223 -53/85 23.00 31.25 8.25 5.76 27.21
VU-226 -65/122 55.50 63.30 7.80 4.49 130.21
VU-229 26/104 28.00 28.50 0.50 330.00 207.00
VU-230 50/104 39.00 41.05 2.05 8.52 10.55
VU-233 -54/104 36.50 43.00 6.50 2.33 21.32
VU-235 46/126 29.60 42.66 13.06 18.14 28.52 1 Au sample cut
VU-237 34/126 60.00 61.50 1.50 58.90 84.20
VU-239 -40/126 10.50 12.00 1.50 49.90 51.60
53.31 62.60 9.29 49.53 118.11 2 Au samples cut
VU-241 44/98 64.50 73.50 9.00 1.47 3.20
VU-245 -13/136 64.46 67.00 2.54 105.26 77.12
VU-247 -24/136 33.77 49.68 15.91 20.21 25.06 1 Au sample cut
63.62 64.12 0.50 76.20 92.10
80.14 80.64 0.50 75.30 49.00
VU-249 -34/136 33.43 37.12 3.69 6.88 9.18

Kenneth C. McNaughton, M.A.Sc., P.Eng., Chief Exploration Officer, Pretium Resources Inc. is the Qualified Person (QP) responsible for the Brucejack Project exploration program.

About Pretivm

Pretivm is creating value through gold at its high-grade gold Brucejack Project, located in northern British Columbia. Brucejack hosts a major undeveloped high-grade gold resource, with Probable Mineral Reserves in the Valley of the Kings totalling 6.6 million ounces of gold (15.1 million tonnes grading 13.6 grams of gold per tonne). Brucejack is being advanced as a high-grade underground mine with an average of 425,700 ounces of gold produced annually for the first 10 years and an average of 321,500 ounces of gold produced annually over the Project’s 22-year mine life. Commercial production is targeted to commence in 2016.

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