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Precious Metals at the Quartz Breccia
3/6/2013 4:25:32 AM  |  | 259 reads  | Post #32278980

This calculation of the mineral at the Quartz Breccia needs its own thread.

Refer to the cross section at http://www.bardventures.com/i/pdf/QtzBx-Sect1-WithHole70.pdf and note that as we move north from hole 04 the mineral gets more consistent and by the time we get to hole 70 the entire depth is fully mineralized. The moly in hole 70 along with the decreasing length of non-mineralized sections in hole 69 and 03 as we move north shows that we are really just at the edge of the hotter portion of the deposotional envirnoment. Even so, the intercepts here are good; and given that the mineral starts essentially at surface, we are dealing with an open pit scenario. Open pits take all the mineralized rock and using an average grade is valid as it represents what actually occurs during the mining process. Leaner rock is mixed with richer grades if necessary.

Below is an average mining grade calculation using holes 03, 69, and 70. I used today's prices of Ag \$29/oz, Cu \$3.50/lb and Mo \$11.40/lb

6.27 g/t Ag x 15.9m x \$0.93/g = 92.7

0.03% Mo x 70.2m /100% x 1000kg/t x \$25.11/kg = 528.8

0.09% Mo x 108.3m /100% x 1000kg/t x \$25.11/kg = 2447.5

0.17% Cu x 11.9m /100% x 1000kg/t x \$7.71/kg = 156.0

8.51 g/t Ag x 74.4m x \$0.93/g = 588.8

0.04% Mo x 69.5m /100% x 1000kg/t x \$25.11/kg = 698.1

0.05% Mo x 13.2m /100% x 1000kg/t x \$25.11/kg = 165.7

0.09% Cu x 251.8m /100% x 1000kg/t x \$7.71/kg = 1747.2

0.048% Cu x 106m /100% x 1000kg/t x \$7.71/kg = 392.3

0.044% Mo x 14m /100% x 1000kg/t x \$25.11/kg = 154.7

0.061% Mo x 104m /100% x 1000kg/t x \$25.11/kg = 1593.0

9.7 g/t Ag x 8.5m x \$0.93/g = 76.7

28.86 g/t Ag x 132m x \$0.93/g = 3542.9

0.09% Cu x 147m /100% x 1000kg/t x \$7.71/kg = 1020.0

5.43 g/t Ag x 18m x \$0.93/g = 90.9

0.09% Mo x 117.4m /100% x 1000kg/t x \$25.11/kg = 2653.1

70.49 g/t Ag x 214.7m x \$0.93/g = 14704.8

0.11% Cu x 186m /100% x 1000kg/t x \$7.71/kg = 1577.5

8.51 g/t Ag x 11.2m x \$0.93/g = 88.6

The above intercepts provide a total value of 32319.3 \$m/t. Dividing out our total depth to mineral, for the three holes (410m+410m+445m) = 1265m gives us the calculation below which assigns a zero dollar value to the sections containing no mineral.

(32319.3 \$m/t)/ 1265m = \$25.49/tonne

Recovery at the Alaskite NI43-101 showed ninety percent so if we use that we arrive at a gross ore value of \$23.00/tonne

Processing costs from page 77 of the Alaskite PEA are: \$8.67 total for mining, processing and G&A and leave us over \$14.33/tonne, not bad considering what the geology is telling us about where we are in the depositional model and the fact that the gold and rhenium have been left out of these calculations. But as an example hole 69 has just under fifty metres of half a gram of Au in the pit zone, with gold around \$50/gram that's \$25/tonne right to the bottom line.

We will look at gold later in another post, but moving on to tonnage we can use the Hard Rock Miners Handbook Rules of Thumbhttp://www.world-of-stocks.com/hp_content/pdf/Mcintosh%20Engineering_RulesofThumb.pdf at hole 70 which is continuously mineralized for over 400m. This gives us a width of 200m and a fat length of 800m which seems very large but yet the moly mixed with silver tells us that we are a ways away from the hotter depositional area and so the old timers' rule likely holds true.

Tonnage:

400m x 200m x 800m x 2.7tonne/cubic metre = 173 million tonnes.

So with \$14/tonne ore plus gold and rhenium bringing us to an average of probably just under twenty dollars a tonne we have.

For value with Ag, Cu, & Mo alone

173 million tonnes x \$14.33/ tonne = \$2.479 billion

For projected value with Ag, Cu, Mo, plus Au & Re

173 million tonnes x ~ \$20/ tonne = \$3.46 billion

So there we have it again, the same \$3.4 billion that I have calculated in the past.

We have used standard mining rule of thumb and a simple three hole average that incorporates non-mineralized ore to indicate that we are dealing with a major open-pittable poly-metallic precious metals ore body.