Hi CS and Wiz,
Thanks for the great posts. I see the future of the ADL Mining District through a slightly different lens than you guys might. I wholeheartedly agree that things take a lot longer in this industry than many might suspect. There’s no doubt about it. However, I’m not sure if many of us appreciate the significance of what happened recently when the Antonino Adit intersected the DL1 Vein within the extremely well-ventilated “old workings”. I like to keep my focus on the likely ECONOMICS of this mining operation. This parameter is the one closest related to the success of an investment here.
The ECONOMICS of this operation are what they are, and the potential ECONOMICS are complex but very compelling. A lot of this has to do with the grades mined by SMFL at the deepest part of their operations at “Level 2”. We all know about the 64 gpt gold grade AVERAGE over 30 years but the reality is that these historical grades were improving with depth all of the way down to “Level 2”, which was as low as they mined. SMFL’s most recent work done at Level 2 graded higher than that average grade of 64 gpt. This is the hallmark of a mesothermal vein system i.e. increasing grades and widths with depth.
These stellar historical grades were recently corroborated by the 16 samples Auryn took at the intersection of Shaft A and Level 2. THIS WAS A HUGE EVENT FROM AN ECONOMIC POTENTIAL POINT OF VIEW AS IT CORROBORATED MUCH OLDER WORK. Recall also that there was no contribution from copper to the historical grades of 64 gpt gold averaged by SMFL in between Level 2 and the surface. You might think of the Antonino Adit as the new “Level 3” which is about 10 to 15-meters below the deepest level of SMFL’s exploitation efforts at “Level 2” which is about 70-meters below the plateau surface.
Now, at this new Level 3 known as the Antonino Adit, all of a sudden, there is evidence of supergene enrichment (the blue material found in the Antonino Adit), all over the place immediately below Level 2 within the Antonino Adit. The ECONOMICS of this DL1 Vein operation are going to be heavily tied to the grades found historically at Level 2 AND BELOW LEVEL 2 where the new developments are being revealed. They’re also going to be heavily tied to the ability to ramp up production via simultaneously mining two working faces at each level, starting at Level 3, as well as mining different levels of the mine at the same time. This is where the access to the ventilation system within the “old workings” comes in. The operation also needed a “haulage adit” to bring mined ore to the surface. Until the recent completion of the Antonino Adit (now a “haulage adit”) and the intersection of the Antonino Adit with the DL1 Vein and the gaining of access to the ventilation system within the “old workings”, these potential ECONOMICS were a distant pipe dream. Now they’re within grasp.
The way I see it, over the recent 12 months of drifting the Antonino Adit, AURYN HAS BEEN “MINING” PLENTY BUT JUST NOT “SHIPPING” A WHOLE LOT. I don’t know what percentage of the ore removed during the drifting of the Antonino Adit will eventually be shipped or possibly processed on site. This is NOT the DL1 Vein ore that we know a lot about. During the drifting of this adit, the miners advanced 350-meters during about 240 workdays. They averaged about 1.45-meters per 9-hour workday or about 0.16-meters per hour. (5-day work weeks with about 5 weeks off due to the wheel-loader breaking down in November.)
This was real “mining”. The difference from here on out is that we’re going to be working down the long axis of a KNOWN (and recently corroborated) high-grade vein instead of cutting across small, mineralized structures that we had no idea even existed. It’s going to be the same “mining cycle” consisting of blasting involving drilling bore holes, stuffing them with explosives, blasting the rock, letting the dust settle and mucking/scooping up the ore and delivering it to the crusher. All of that equipment is already in place. The historical “mining” rate for this +/- 7 man crew working 9-hour days with the equipment they have in place is a KNOWN. This KNOWN factors in all of the different variables present at this mining operation.
Soon it will be two crews instead of one. The workday will include three 8-hour shifts instead of one 9-hour shift. Nine-hour workdays will give rise to 24-hour workdays, an increase of 2.66-fold. I think it would be pretty safe to multiply that previous mining rate by 2.66 just based on an added crew. This performance level is still in the KNOWN category. Assuming an adit working face of 3.5 meters width and 4-meters in height and a 2-meter bore hole for the explosives as well as a specific gravity for the ore of 3.1 Tonnes/cubic meter, one blast was freeing up 43 Tonnes of ore per 9-hour shift with one crew. If you multiply that by 2.66 then you’d come up with 115 Tonnes per 24-hour workday JUST WITH THE EXISTING EQUIPMENT but with an added crew. That’s about as far as we can go with the KNOWNS for now i.e. 115 Tonnes of rock being delivered to the crusher per 24-hour workday. LET’S LET THIS BE OUR “BASE CASE”, NO FRILLS SCENARIO i.e. 115 TONNES PER DAY SENT TO THE CRUSHER. Note that improvements to the camp would be needed to add and house another crew.
EVEN THE NO FRILLS “BASE CASE” MATH CAN GET A LITTLE CRAZY BUT THERE WAS NO “BASE CASE” MATH UNTIL THE RECENT INTERSECTION OF THE DL1, THE GAINING OF ACCESS TO THE VENTILATION SYSTEM WITHIN THE “OLD WORKINGS” AND THE COMPLETION OF THE “HAULAGE ADIT”
In addition to the above assumptions, assume that each 20-tonne truck being deployed can make a minimum of 3 round trips to the mill per day. Each round trip should take about 5 to 6 hours permitting 4 round trips per day but for the sake of conservatism let’s round that down to 3 round trips per day. This would represent 60-Tonnes per day “shipped” (PER TRUCK IN USE) and 115 Tonnes per day “mined” and delivered to the crusher. This means that the mountain of ore sitting under the upwardly inclined conveyor belt coming off of the crusher WILL BE GROWING ON A DAILY BASIS. IN ORDER TO KEEP THAT MOUNTAIN OF ORE FROM OCCUPYING TOO MUCH SPACE ON THE PLATEAU, MORE TRUCKS ARE GOING TO NEED TO BE DEPLOYED IN ORDER TO KEEP THE SIZE OF THE MOUNTAIN THE SAME. Assuming an average grade of 31 gpt “gold equivalent” (1 OPT), an AISC of $900 per ounce and a POG of $1,900 then this represents $60,000 profits per day PER TRUCK THAT CAN DO 3 ROUND TRIPS PER DAY. Remember that this is the BASE CASE scenario using inefficient jack leg drills and only the equipment presently in place.
KEEP YOUR FOCUS ON THE SIZE OF THE MOUNTAIN OF CRUSHED ORE AND THE NUMBER OF TRUCKS, EACH ADDING $60,000 TO THE DAILY PROFITS, NEEDED TO KEEP THAT MOUNTAIN THE SAME SIZE
During the drifting of the Antonino Adit, there was, of course, only one total working face being mined at a time by one crew. After an end of shift blast, nothing could get done until the dust settled and the ventilation system did its thing. Because of the ventilation improvements associated with intersecting the “old workings”, multiple working faces can now be simultaneously mined, with the blast residue, equipment exhaust and other toxic gases being successfully removed. The miners can stay productive during the dust settling phase. Why? Because not only did they hit the KNOWN, well-mineralized DL1 Vein, they also tapped into the network of ventilation raises, ventilation chimneys to surface and the emergency exits that were already in place. Soon they can SAFELY work on multiple working faces at multiple levels simultaneously. SERNAGEOMIN will tell the engineers the threshold levels of toxic gases that need to be constantly monitored for.
HOW TO GROW THE SIZE OF THAT MOUNTAIN OF CRUSHED ORE AGGRESSIVELY AS WELL AS THE NEED FOR MORE TRUCKS (EACH CLEARING $60,000 PER DAY IN PROFITS) TO KEEP THE MOUNTAIN THE SAME SIZE
During the drifting of the Antonino Adit, there was no need for a fully-mechanized “jumbo drill rig”. It would have been sitting idle most of the day. I would guess that you’d need to be working perhaps 6 or so working faces simultaneously in order to justify the deployment of a jumbo. I can only imagine the time savings involved in drilling out a working face with a jumbo as opposed to using hand-held jack leg drills under the BASE CASE scenario. Management is going to be highly incentivized to grow that mountain of ore (and the number of trucks needed to keep the size in check) as aggressively as they can. “MECHANIZATION” is going to be the key.
The transition will be from mining ore of unknown values at a snail’s pace during the drifting of the Antonino Adit, to mining high-grade ore at a brisk pace. Auryn now has a “haulage adit” to get the ore out of the belly of the mountain and to a crusher. It’s the Antonino Adit. The portal (opening) of the adit has been strategically located at the commencement of the North Road heading down the hill.
I’d argue that there is indeed a lot of work left to do but that a lot of the heavy lifting from a risk point of view, got mitigated when they intersected the DL1 Vein. Now, things are going to get a lot more mechanical and what is going to appear on the table is LEVERAGE. Advances in MECHANIZATION that never made economic sense in the past suddenly will. On-site “beneficiation” measures like dirt cheap high-G force gravity separators can be deployed to increase the grade of the ore being shipped. These never made economic sense in the past but they sure might in the near term.
I agree that with the supply chain issues in the world, the procurement of equipment is going to need a longer lead time. What I prefer to concentrate on is the BASE CASE scenario we have in place now without adding equipment. How much money can be made with two crews and the ability to work 24h hour days on multiple faces simultaneously? The numbers can be staggering. Equally staggering is the ability to ramp up production due to the cash flow. Auryn’s brand new 20-tonne truck cost $100,000. Under the above scenario, management could double that $60,000 per day profit by adding ONE new truck that would cost 1.66 days of profit. THAT’S LEVERAGE.