Thank you. Good morning. Thank you for joining Gold Resource Corporation's 2017 Fourth Quarter and Year-End Conference Call. I expect my 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, March 9, 2018, 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, 2017.
In an effort to streamline quarterly conference calls, while still being available to take shareholder questions, I'm going to take a different approach to conference calls this year. I'm not going to just [ regularly take ] the quarterly numbers than anyone can read in the 10-K or quarterly reports. I'm going to hit the highlights, give color to updates and address problems or issues that may need to be addressed, and then turn the call over for questions. This hopefully will benefit everyone attending the call by making them shorter and more efficient.
2017 was another great year for Gold Resource Corporation. I am very proud that the company delivered its seventh consecutive year of profitability. We increased our cash balance by $8.2 million to $22.4 million and ended the year with $27.5 million in working capital. In addition to being profitable and adding to our cash balances and working capital, we succeeded on numerous fronts, including the following.
We reached the high end of our annual gold production outlook range with 28,117 gold ounces. We achieved our annual silver production outlook range with 1.77 million ounces. We significantly expanded the strike length of our Oaxaca Mining Unit's Arista Mine Switchback vein system from about 300 meters on strike length to now over 900 meters of strike, an increase of 600 meters or 200% in about 12 months. As part of the Arista mine's development, we successfully developed 5 levels at the Switchback vein system prior to commencing bulk tonnage mining methods in February of this year. Our Alta Gracia project's Mirador Mine development is now gaining more momentum, developing the mineralized veins. We continue to develop upwards, which what we believe will get us into higher grade zones in the mine. This is after overcoming challenges of ground stability issues early on and transitioning away from a mine contractor during 2017, which initially slowed our progress.
At our Nevada mining unit, we acquired an additional 153 claims to add to our Isabella Pearl project, now totaling 494 claims covering 9,000 acres with over 6 miles of structural trend for exploration upside. We optimized and finalized the Isabella Pearl mine plan, purchased and took delivery of both the new crushing plant and new conveyor stacking system and have made significant milestone payments of about $3.1 million of the $4.1 million ADR plan, which is the final process in the Isabella Pearl operation in order to produce dore. The ADR plant construction is about 95% complete, being built modularly and will be moved to site for setup once we are permitted to begin mining.
We continue to pursue the final permit for the Isabella Pearl project from the Bureau of Land Management and are optimistic, we may receive approval in the near future. We also acquired East Camp Douglas property during 2017, which has many historic high-grade gold surface samples and high-grade gold drill results. But we believe the property has not been tested in its most prospective areas, which we plan to do over time. East Camp provides exciting exploration potential for the company as a large district scale exploration play and a great addition to the Nevada mining unit.
Our total cash cost for precious metal gold equivalent ounce sold for 2017 was $75, a decrease of $473 from $548 the prior year. Our total all-in sustaining costs for precious metal gold equivalent ounces sold was $590, a decrease of $380 from $970 the prior year. A large part of the cost decrease was due to our significant base metal production and sales. We are mining higher base metal grades at the depths in both the Arista and Switchback vein systems.
During 2018, we were able to capitalize on 10-year highs and zinc prices and other strong market prices for copper and lead by mining areas of the mine with high base metal grades, which lowered our cost per ounce when used as a byproduct credit, and ultimately, generates additional revenue.
We've been mining the Arista mines, Arista vein system for approximately 8 years now, expanding underground operations not only along strike, but also mining significantly deeper into the lower levels of the deposit. A parallel system within the Arista mine called Switchback was accessed in late 2016, when we drilled ramps above 500 meters to the east. We entered the Switchback vein system at its current known deepest elevation in this area and plan to mine upwards to higher elevations where we expect to see increases in precious metal grades and lower base metal grades over time. The 2017 low production costs driven from base metal byproduct credits may not last forever, as we mine upwards at the Switchback vein system. If the typical gradation of the Switchback vein system comports with both the neighboring Arista vein system and the typical epithermal vein system models. We may ultimately, see a future reduction in base metal production offset by higher precious metal production as Switchback, but time will tell.
Regardless, it's great to have the additional revenue from high-grade base metals from this deep portion of the Arista mine, substantially adding to our annual net sales and net income. We posted annual net income of $4.2 million or $0.07 per share. That number factors in the $7.3 million in noncash new tax law adjustments that lowered our annual earnings by 13%.
We had annual net sales of $110.2 million, a $26.9 million increase over the prior year. We had mine gross profit of $42.1 million, and $19.7 million increase over the prior year. We remain committed to shareholder dividends, returning $1.1 million back to the owners of the company, the shareholders, in consecutive monthly dividends. The company produced 28,117 gold ounces, 1,773,263 silver ounces, 1,141 tonnes of copper, 5,365 tonnes of lead and 16,301 tonnes of zinc.
We successfully reached our production outlook target for 2017. And for 2018, our target is a similar outlook of 27,000 ounces of gold and 1.7 million ounces of silver with a plus or minus 10% range.
In addition to our precious metal production targets, we expect to produce substantial base metals, again, in 2018 for additional revenue. We continue to focus on margin, while mining tonnes based on Net Smelter Return, NSR, values per tonne of all 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. The company's 2018 production outlook targets efficient, precious and base metal production during the year to support our budget plans for 3 substantial capital expenditure projects as well as our ordinary CapEx requirements. The 3 large CapEx spends targeted in 2018, include a Phase 4 raise to our tailing facility, raising the dam height by approximately 10 meters.
The second is the power line project, where we hope to be on power grid by late this year, if the power commission continues to move forward on their current plans. I caveat that with the if, as we are not in control of this project's construction and time lines. But as of now, things are moving forward and connecting to the power grid as expected to save millions per year on power costs. The third project is a [ Paceville ] project where we plan to construct a pace plant to utilize [ Paceville ] in the Arista mine for 3 primary reasons. The first reason is safety. We want to limit the number of stopes left open at Switchback and elsewhere in the Arista mine for greater ground stability. The second reason is to increase total tailings storage capacity and extend the overall tailings facility life. The third reason is the ability to recover more mining pillars for additional ore recovery at Switchback.
The Board of Directors would have approved the [ Paceville ] project based on its increased safety factors alone, but the additional benefits of tailings capacity and pillar recovery make the projects over $5 million CapEx, a great project to undertake this year with the goal of having the plant operational by the end of 2018. The remaining CapEx is on all 3 projects total about $10 million, an additional CapEx spending for 2018 above and beyond the normal CapEx.
In addition to this long list of 2017 accomplishments, we just announced the company's strongest tonnage and a proven and probable reserve report to date, increasing our mine life by approximately one year over the prior year's reserve report. We converted a large portion of mineralized material into proven and probable reserves, while generating additional mineralized material targeting future conversion.
Please see the reserve report press release issued yesterday for more details and watch for the full report to be posted on our website in the near future. On a related note, the proven and probable gold ounces and mineralized material in the reserve report do not include mineralization from our Nevada, Isabella Pearl project. We are currently finalizing the reserve report for Isabella Pearl and plan to publicly update those reserves in the near future, which will add to the company-wide reserves.
We accomplished all of this, along with many other successes without raising money and without going into long-term corporate debt. 2017 was another great year for the company. I want to, again, highlight the fact, 2017 marked our seventh consecutive year of profitability, which few -- if any other mining companies can show such a track record. This fact, not only differentiates Gold Resource Corporation within our industry, but boldly speaks to the fact we have and continue to run this company like a profitable business. We have not relied, as many in the industry often do, on equity sales or long-term debt to keep the company going by topping off the treasury or by bailing management out of bad business decisions. We make money and have grown organically with that money for over 7 years now. Well, that may not always be the case. Seven consecutive profitable years is a great track record, so far, and a track record that stands out within the mining industry. I am proud of our excellent team that makes that accomplishment possible.
With that, I would like to thank you, everyone, for their time today on this conference call. Let's move onto the question-and-answer portion of the call in an effort to efficiently address the Q&A portion of the call without wasting anyone's time. And since we don't screen filter or limit who can call in any distracting or antagonistic calls will be terminated, and I will simply move onto the next productive caller. Operator, please open up the lines for the Q&A and take our first question, if there is one.