Thank you. Good morning, everyone, and thank you for joining Gold Resource Corporation's 2017 Third Quarter Conference Call. I expect my brief comments to run approximately 10 minutes, followed by a question-and-answer period. Joining me on the call today for the Q&A portion will be Mr. John Labate, our Chief Financial Officer.
Let me remind everyone that certain statements made on this call are not historical facts and are considered forward-looking statements. These statements are subject to numerous risks and uncertainties as described in our annual report on Form 10-K and other SEC filings, which could cause our actual results to differ materially from those expressed in or implied by our comments. Forward-looking statements in the earnings release that we issued yesterday, along with the comments on this call, are made only as of today, November 1, 2017, and we undertake no obligation to publicly update any of these forward-looking statements as actual events unfold. You can find a reconciliation of non-GAAP financial measures referred to in our remarks in our Form 10-K filed with the SEC for the year ended December 31, 2016.
Third quarter highlights include net income of $4.6 million or earnings of $0.08 per share. Our Oaxaca Mining Unit generated net sales of $31.1 million and mine gross profit of $11.2 million. Our cash cost per ounce produced was $2 per ounce after base metal by-product credits. And our cash balance in the third quarter held steady as it did the first 2 quarters at $15.8 million. Overall, it was a solid quarter.
Third quarter production from our Oaxaca Mining Unit totaled 6,465 gold ounces, 392,153 silver ounces, 291 tonnes of copper, 1,449 tonnes of lead and 4,628 tonnes of zinc before payable metal deductions.
Calculating the gold and silver as a precious metal gold equivalent, we produced 11,637 ounces at a realized 75.8:1 silver-to-gold ratio. We milled an average of 1,346 tonnes per day, or 114,678 total milled tonnes for the quarter.
Our total cash cost after base metal by-product credits per precious metal gold equivalent ounce sold and including royalties during the quarter, totaled $2 per ounce. We continue to see the positive impact of strong base metal prices, including zinc prices at record highs and our significant base metal production, which lowered our cash cost to $2. Average metal prices realized of copper, lead and zinc were all up on a quarterly and 9-month basis over the same periods in 2016.
Our all-in sustaining cash cost per ounce, a non-GAAP measure for the third quarter, totaled $639, down from $770 in the second quarter. During the quarter, we sold 5,672 gold ounces, 371,754 silver ounces, 328 tonnes of copper, 1,389 tonnes of lead and 4,326 tonnes of zinc.
Average grade and recoveries at the Oaxaca Mining Unit for Q3 included gold grade at 2.09 grams per tonne with 84% recovery, silver grade at 117 grams per tonne, with 91% recovery; copper grade at 0.35% with 72% recovery; lead grade at 1.73% with 73% recovery and a zinc grade of 5.04% with an 80% recovery. During the quarter, gold and base metal grades increased while silver grades stayed the same.
As is the case quarter-on-quarter, great variations are due primarily to the specific areas of the Arista deposit being mined during that quarter.
For the third quarter, we generated revenues, which are net of smelter charges of $31.1 million, generated mine gross profit of $11.2 million and a net income of $4.6 million, or $0.08 per share. Q3 average metal prices realized were $1,289 per ounce gold and $17 per ounce silver. Please note, because our metal sales include an embedded derivative, quarterly realized sales prices may be higher or lower than average quarterly metal prices.
The company maintains its 2017 outlook range, which range is based on a plus or minus 5% of approximately 27,500 gold ounces and 1.85 million silver ounces, along with significant base metal production. We continue to focus on margin while mining tonnes based on net smelter return, or NSR values per tonne of all the metals to maximize cash flow.
Base metal production generally results in lower production cost per tonne and per ounce when used as a credit against precious metal production cost. Base metal sales were the primary driver in lowering our cash cost and all-in sustaining costs per ounce for the quarter.
During the third quarter, Arista Mine development ore from the Switchback vein system accounted for approximately 48.5% of ore feed to the Aguila mill, the remainder coming from production stopes in the Arista Mine. Production areas from Arista were split evenly between levels 4 to 6 and levels 18 to 22. The new ventilation fans servicing Switchback are being installed and completed.
We have successfully reached our goal of approximately 1 full year of Switchback mine development prior to implementing both tonnage mining methods. Having taken a full year to develop this area of the Arista Mine, we now have close to an estimated 2 years of production development at Switchback for future mining, run rate dependent. We plan to begin bulk tonnage stope mining methods at Switchback using both long haul and cut-and-fill by the end of 2017 or early 2018.
Turning to the Mirador Mine. We have fully undercut the targeted mineralized zone with development on the 1470 level, which is estimated to be the bottom of the Mirador vein mineralization in this area. We have started the ramp to reach upper levels. We're past the new definition drilling -- has intercepted higher grade silver. While the mine has had its share of development challenges, first with the past contractor we terminated and then with tough ground, during the quarter, it also saw signs of success with 3,500 tonnes of development ore being extracted averaging 1 gram per tonne gold and 146 grams per tonne silver.
Ramping up the agitated leach plant for Mirador ore processing has also presented a few challenges as well as we continue to work through mill optimizations. The agitated leach portions of the mill was originally designed and built for processing open pit gold ore at a 300-tonne-per-day nominal capacity. Some adjustments and modifications to the mill had been necessary for the Mirador ore type, which is predominantly a silver ore.
Throughput maximums of Mirador silver ore through the agitated leach are estimated to be less than the nominal gold or rate of 300-tonne-per-day capacity. Exact throughput amounts have yet to be determined with the governing factors for throughput being the sizing of the Merrill Crowe precipitation circuit and slightly higher retention time frames in the leach tanks for the Mirador's high-grade silver ore. We still target to exit this year with 150-tonne-per-day average throughput goal, mine development and mill optimization dependent.
Operations in our Nevada mining unit during the quarter included taking delivery of the conveyors and radial stackers made by Superior and the crushing plant made by Telsmith for the Isabella Pearl Project. It is also exciting to see all this beautiful new equipment in our laydown yard ready to be installed and go to work producing gold for our Isabella Pearl Project. In addition, all this quality equipment was proudly made in America. We paid $1.7 million for the stackers during the second and third quarters and secured equipment financing for the crusher in the third quarter in the amount of $2.4 million. We continue to make progress payments on the project's ADR process plant, which is the final process of the plant where gold doré bars are poured. The ADR construction is nearing completion.
We are still working and waiting on final BLM permit approval for the project, but remain optimistic and comfortable having ordered the key pieces of long lead time equipment so that we may transition from the permitting phase to the construction phase as soon as possible upon final permit approval.
Turning to exploration. Our Oaxaca Mining Unit's exploration focus continues to be on expansion efforts of the Arista Mines, Arista and Switchback vein systems. Additional underground drilling and drill pad construction continue to better test for deposit expansion. The Switchback vein system continues to grow and has potential to become as large or larger than the Arista vein system. It's exciting to watch our Arista Mine grow and expand after 7 years of production. We hope to have additional drill results from Switchback before year-end.
Exploration at our Nevada mining unit focused on Gold Mesa with drill intercepts including 9.14 meters of 1.59-grams-per-tonne gold starting from surface.
With surface and near surface high-grade gold on all 4 of our properties in the pipeline of projects, Nevada, our mining unit there is very exciting.
With that, I would like to thank everyone for their time today on the conference call. Let's move onto the question-and-answer portion of the call. [Operator Instructions] Operator, please open up the lines for a Q&A and take a question if there is one. Thank you.