Frederick H. Earnest
Analyst · H.C. Wainwright
Thank you, Doug. I'll first start with a discussion of the metallurgical optimization program. During the quarter, we completed a metallurgical optimization program for the Mt Todd project. The objective of this program was to assess overall gold recoveries at finer-grind sizes and evaluate the efficiency of the FLSmidth VXP mills as opposed to the Glencore ISA mills, which were contemplated in the 2018 PFS. As a result of this test work and related leached recovery tests, a final grind size of 80% passing 40 microns was selected.
In August 2019, we announced the results of the fine-grinding test completed on samples over a wide range of sample head grades. These tests confirm that the Mt Todd ore can be efficiently ground to a finer final product size than estimated in the 2018 PFS. Leaching the 40-micron size material resulted in a higher life-of-mine gold recoveries of 91.9% compared to 86.4% that was used in the 2018 PFS, those previous results were at 60 microns, and an increase in total gold produced over the life of the mine of 349,000 ounces. It also demonstrated that at a 40-micron grind size, the tail grade is nearly constant within specific grade ranges.
These latest metallurgical test programs have confirmed: first, the efficiency of ore sorting across a broad range of head grades and the natural concentration of gold in the screen undersize prior to sorting; second, the efficiency of fine grinding and improved gold recoveries at the selected size of 80% passing, 40 microns; and last, the selection of the FLSmidth VXP mill as the preferred fine-grinding mill.
As I indicated previously, in the third quarter, we also commissioned an independent review of the fine-grinding circuit and completed an independent benchmarking study to assess the appropriateness of capital and operating cost estimates, construction and ramp-up schedules, owner's costs and key components of the project such as power supply. The comprehensive results of these studies were incorporated into an -- into the updated preliminary feasibility study.
Let me talk about the results of that study. In September, we announced the results of the 2019 PFS for the Mt Todd project. And in October, we filed -- earlier this month, we filed an updated 43-101 Technical Report. The 2019 PFS was based on the results of the metallurgical optimization program, a comprehensive review of the project and the redesign of elements of the process flow sheet, most importantly, the grinding circuit.
The 2019 PFS provides an assessment of the Mt Todd gold project at a gold price of $1,350 an ounce, with a foreign exchange rate of USD 0.70 per Australia dollar. The results reflect improved average life-of-mine gold recoveries of 91.9% and indicate a net present value at a 5% discount rate of USD 823 million, with an internal rate of return of 23.4%. At the current gold price and foreign exchange rate, the net present value at a 5% discount rate is approximately USD 1.15 billion with an internal rate of return of 30.2%.
Now turning to permitting. As indicated, we submitted the Mt Todd mine management plan, which is the equivalent of a mine operating permit here in North America to the Northern Territory Department of Mines in November of 2018, and the review is ongoing. We expect to receive authorization of the mine management plan later this year or early next year. Once approved, Vista will hold all the major permits for the Mt Todd project.
Now turning to the los Reyes project. Earlier this week, we received a third USD 1.5 million option payment for the los Reyes gold and silver project. As a reminder, in October of 2017, we entered into an option agreement, giving Minera Alamos an exclusive option to earn a 100% interest in the project. Prime Mining has since assumed the option agreement from Minera Alamos and has paid the third installment. To date, Minera Alamos and Prime Mining have paid $4.7 million in option payments. The final payment of USD 1.5 million is expected to be received by Vista on or before October 23, 2021.
So next steps. Our message going forward is very clear. We do not believe that the debt and dilution to build Mt Todd on a stand-alone basis is in the best interest of our shareholders. We intend to continue to derisk Mt Todd in a cost-effective manner while seeking to secure a development partner. The 2019 PFS provides a solid basis for engagement with prospective development partners that recognize the value of Mt Todd, allowing Vista to provide appropriate reward for its shareholders.
We will continue to focus on achieving evaluation for Mt Todd that is warranted for a multimillion ounce gold project in Australia's low-risk Northern Territory. With favorable costs, robust project economics and environmental permits in hand, we believe that these factors, coupled with the technical advance -- the technically advanced stage of the project and excellent infrastructure, place Mt Todd on a short list of the most attractive development-stage gold projects. It's our expectation that we can build on this to justify a greater appreciation from our industry peers and the investment community.
Looking at our share price performance. Year-to-date, Vista's share price is up 47%. As we've mentioned in previous calls, Vista is highly leveraged to the price of gold, and we understand the value of higher gold prices as it relates to project economics.
Since November 13, when gold broke out of its horizontal trend, that would be November 13, 2018, through October 11 of this year, the gold price improved by approximately 23%, while Vista's share price improved by 77%. This is 3.3x the improvement in the price of gold on a percentage basis. This compares to the value of the GDXJ improving 1.8x the improvement in the price of gold. We believe that the ongoing optimization work will further enhance the leverage that Vista shareholders enjoy relative to the price of gold.
In conclusion, our Mt Todd gold project is the largest single deposit -- undeveloped gold project in Australia. With 5.85 million ounces of gold in proven and probable reserves, Vista controls the third largest reserve package in Australia. It is ideally located in the Northern Territory of Australia, with paved roads to the site and other existing infrastructure such as power lines, a natural gas pipeline, the freshwater storage reservoir and tailings incumbent facility. The project improvements we have discussed today, along with our estimated reserve and production profiles have created the foundation for the leverage to gold price and improved shareholder value that we have seen over the last 6 months.
We believe Vista's leverage to the gold price demonstrates that Mt Todd would be an extremely attractive gold project even in a lower gold price environment. We have earned the trust of the local stakeholders, and we believe that our social license is firmly in hand. We've worked hard to secure the authorization of the major environmental permits and are now focused on gaining the authorization of the mine management plan.
We are extremely pleased with the results of the 2019 PFS, which demonstrated a net present value at a 5% discount rate of $823 million, with an internal rate of return of 23.4% at a $13.50 gold price and a USD 0.70 per Australian dollar foreign exchange rate.
I would remind you that at the current gold price and foreign exchange rate, the project economics are even more compelling with an NPV5 of approximately USD 1.15 billion and an internal rate of return of 30.2%. We believe that Mt Todd is a superior asset located in the Tier 1 mining jurisdiction and one of the most attractive development-stage gold projects not just in Australia but in the world.
For a more comprehensive assessment of the value according to Vista in the Mt Todd project, I refer you to our corporate presentation, which can be found on our website at www.vistagold.com. We believe that Vista Gold represents an exceptional investment opportunity for the gold investor looking for value, growth potential, low geopolitical exposure and leverage to the gold price.
That concludes our prepared remarks. We will now respond to any questions from the participants on this call.