Exhibit 99.1

·             2Q18 net income was $409.6 million, 36.7% higher than 2Q17 net income of $299.7 million. Net income margin in 2Q18 was 22.3% compared with 19.6% in 2Q17. The increase was principally due to higher sales. The second quarter net income was net of a tax effect of $56.9 million due to a deferred tax adjustment and FX gain resulting from the local currency depreciation in Mexico.

·             2Q18 adjusted EBITDA was $955.2 million, 35.0% higher than 2Q17 adjusted EBITDA of $707.4 million. The adjusted EBITDA margin in 2Q18 was 52.0% compared with 46.2% in 2Q17.

·             Copper production: Copper production increased 2.0% to 219,962 tons in 2Q18 compared with 2Q17 mainly due to higher production at our Peruvian operations of Toquepala (+14.8%) and Cuajone (+15.8%) as a result of higher ore grades at both mines. This increase was partially offset by lower production at our Mexican operations.

·             Operating cash cost per pound of copper including by-product revenues credit was $0.81 in 2Q18, compared to $0.98 in 2Q17. The 17.3% operating cash cost decrease is mainly due to higher by-product revenues (+21.3%).

·             Cash flow from operating activities in 6M18 was $1,056.1 million, a 25.1% increase from the $843.9 million in 6M17. This improvement results from the strong generation of cash from operations, due to higher metal prices and cost control efficiencies.

·             Capital investments in 6M18 were $562.1 million, including $168.0 million for the Toquepala expansion, which is on schedule and on budget. The new concentrator will initiate operations in 3Q18, and is budgeted to produce 20,000 tons of copper in 2018 and 100,000 tons annually, thereafter.

·             Michiquillay acquisition: On June 12, 2018, Southern Copper signed a contract and made an initial payment of $12.5 million for the acquisition of the Michiquillay project in Cajamarca, Peru. The Company has created a multidisciplinary management team to plan the development of this project.

Michiquillay is a world class mining project with mineralized material of 1,150 million tons and a copper grade of 0.63%. When developed, we expect Michiquillay to produce 225,000 tons of copper per year (along with by-products of molybdenum, gold and silver) for an initial mine life of more than 25 years, at a competitive cash-cost. We estimate an investment of approximately $2.5 billion will be required and expect production start-up by 2025, with Michiquillay becoming one of Peru´s largest copper mines. The project will create significant business opportunities in the Cajamarca region, generate new jobs for the local communities and contribute with taxes and royalties to the national, regional and local governments.

·                  Peru Labor Negotiations: We have been conducting negotiations with our Peruvian labor unions whose collective bargaining agreements will expire in late 2018. In the second quarter of 2018, we signed a three-year agreement with one of the six unions which include, among other things, annual salary increases of 5% for each of the three years. We continue negotiations with the other five unions.

·             Dividends: On July 19, 2018, the Board of Directors authorized a dividend of $0.40 per share payable on August 21, 2018, to shareholders of record at the close of business on August 8, 2018.

Mr. German Larrea, Chairman of the Board, commenting on the Company´s progress said: “We view the recent fall in copper prices as a result of market concerns for a possible trade war between the United States and China as well as the appreciation of the U.S. dollar. However, we strongly believe that copper market fundamentals are solid, and expect a strong recovery in market prices in the coming months.”

“The continuing progress of our investment program is reflected in the consistent reduction of our unit cash cost, which has decreased by 14% year on year. We are close to completion of the Toquepala expansion project in Peru, which will add 100,000 tons to our annual copper production capacity, allowing us to reach one million tons of annual copper production by 2019, with an even lower cash cost per pound of copper.”

“Southern Copper has the largest copper reserves of the industry and operates high quality world class assets in investment grade countries such as Mexico and Peru. We are currently developing the next phase of a growth program aiming to reach a milestone copper production capacity of 1.5 million tons by 2025.”

Key Financial Data

Note: Figures in millions except per share amounts and %’s.

2Q18                         www.southerncoppercorp.com

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Capital Investments

Southern Copper’s investment philosophy is not based on the outlook of copper prices but on the quality of the assets that we operate and develop. Throughout the years, our strong financial discipline has consistently allowed us to invest on a continuous basis in our superior asset portfolio.

Peruvian Projects

Our portfolio of Board approved projects in Peru has a total capital budget of $2.9 billion of which $1.7 billion have already been invested. Considering the Michiquillay ($2.5 billion) and Los Chancas ($2.8 billion) projects, our investment commitment to Peru increases to $8.2 billion.

Toquepala Expansion Project — Tacna: This $1,255.0 million project includes a new-state-of-the-art concentrator that will increase Toquepala´s annual copper production by 100,000 tons to reach 245,000 tons in 2019, a 69% production increase. As of June 30, 2018, we have invested $1,042 million in this expansion. The project has reached 95% progress and is expected to initiate production in the 3Q18.

Tia Maria - Arequipa: We have completed engineering and after having complied with all environmental requirements, we have obtained the approval of the environmental impact assessment. We are working jointly with the Peruvian government to obtain the construction license for this 120,000 ton annual SX-EW copper greenfield project with a total capital budget of $1,400 million. We expect the license to be issued in 2018.

Mexican Projects

Buenavista Zinc - Sonora: This project is located within the Buenavista facility and contemplates the development of a new concentrator to produce approximately 80,000 tons of zinc and 20,000 tons of additional copper per year. As of today, we have concluded the basic engineering and are working on the purchasing process for the main project components. The project investment budget is $413 million and we expect to initiate operations in 2020. When completed this new zinc concentrator will double the Company’s zinc production capacity.

Pilares — Sonora: Located 6 kilometers away from La Caridad, this project consists of an open-pit mine operation with an annual production capacity of 35,000 tons of copper in concentrates. The ore will be transported from the pit to the primary crushers of the La Caridad copper concentrator through a new off road truck road, 25 meters wide. Environmental permit studies are completed and will be presented to the Environmental Authorities. This project will significantly improve the over-all mineral ore grade (0.78% expected from Pilares vs. 0.34% La Caridad). As of today, we continue with the mine plan preparation, including the final outline design for the road through which the ore will be transported to the La Caridad mill. The investment budget for Pilares is $159 million and we expect it to start producing in 2019.

Conference Call

The Company’s second quarter earnings conference call will be held on Wednesday, July 25, 2018, beginning at 10:00 AM — EST (9:00 AM Lima and Mexico City time).

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Average Metal Prices

Source: Silver — COMEX; Gold and Zinc — LME; Molybdenum — Metals Week Dealer Oxide

Production and Sales

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Southern Copper Corporation

CONDENSED CONSOLIDATED STATEMENT OF EARNINGS

(Unaudited)

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Southern Copper Corporation

CONDENSED CONSOLIDATED BALANCE SHEET
(Unaudited)

As of June 30, 2018, December 31, 2017 and June 30, 2017 there were 773.0 million, 773.0 million and 773.0 million shares outstanding, respectively.

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Southern Copper Corporation

CONDENSED CONSOLIDATED STATEMENT OF CASH FLOW

(Unaudited)

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Company Profile

Southern Copper Corporation (SCC) is one of the largest integrated copper producers in the world and we believe we currently have the largest copper reserves in the industry. The Company is a NYSE and Lima Stock Exchange listed company that is 88.9% owned by Grupo Mexico, a Mexican company listed on the Mexican stock exchange. The remaining 11.1% ownership interest is held by the international investment community. The Company operates mining units and metallurgical facilities in Mexico and Peru and conducts exploration activities in Argentina, Chile, Ecuador, Mexico and Peru.

SCC Corporate Address

USA

1440 E Missouri Ave, Suite 160

Phoenix, AZ 85014, U. S. A.

Phone: (602) 264-1375

Fax: (602) 264-1397

Mexico

Campos Eliseos N° 400

Colonia Lomas de Chapultepec

Delegacion Miguel Hidalgo

C.P. 11000 - MEXICO

Phone: (5255) 1103-5000

Fax: (5255) 1103-5567

Peru

Av. Caminos del Inca 171

Urb. Chacarilla del Estanque

Santiago de Surco

Lima 15038 — PERU

Phone: (511) 512-0440

Fax: (511) 512-0492

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This news release contains forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995. In addition to the risks and uncertainties noted in this news release, there are certain factors that could cause results to differ materially from those anticipated by some of the statements made. These factors include those listed in the Company’s most recently filed quarterly reports on Form 10-Q and annual report on Form 10-K. The Company expressly disclaims any obligation to release publicly any updates or revisions to any forward-looking statements contained herein to reflect any change in the Company’s expectations with regard thereto or any change in events, conditions or circumstances on which any statement is based.

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Non-GAAP Financial Measures

Non-GAAP financial measures are intended to provide additional information only and do not have any standard meaning prescribed by U.S. generally accepted accounting principles (“GAAP”). These measures should not be considered in isolation or as a substitute for measures of performance prepared in accordance with GAAP. In addition, because not all companies use identical calculations, the measures included in this release may not be comparable to similarly titled measures of other companies. Following is a reconciliation of adjusted EBITDA to Net Income attributable to SCC and Operating Cash Cost before by-product revenues and Operating Cash Cost net of by-product revenues to their more comparable GAAP measure:

Adjusted EBITDA

EBITDA (earnings before interest, taxes, depreciation and amortization) is a measure commonly used by companies to evaluate operating performance and the ability to generate cash. Our adjusted EBITDA is not necessarily comparable to similar measures used by other companies. We believe that adjusted EBITDA provides useful information to management, investors and others in understanding and evaluating our operating results.

Our determination of the components of adjusted EBITDA is evaluated periodically based on a review of non-GAAP financial measures used by mining industry analysts. Management believes adjusted EBITDA enhances the comparability of information across reporting periods, is an effective measure for reviewing operating results and, therefore, is a useful measure for both management and investors. EBITDA and adjusted EBITDA do not represent, and should not be considered an alternative to, net income, operating income, or cash flow from operations as those terms are defined by GAAP, and do not necessarily indicate whether cash flows will be sufficient to fund cash.

Operating cash cost per pound of copper produced before by-product revenues and Operating cash cost per pound of copper produced net of by-product revenues

The measure operating cash cost per pound of copper produced net of by-product revenues is a common measure used in the copper industry to track performance and it is a useful management tool that allows us to better allocate our resources. This measure is also used in our investment project evaluation process to determine a project’s potential contribution to our operations, its competitiveness and its relative strength in different price scenarios. The expected contribution of by-products is generally a significant factor used by the copper industry in determining whether to move forward with the development of a new mining project. As the price of our by-product commodities can have significant fluctuations from period to period, the value of its contribution to our costs can be volatile.

Our Operating cash cost per pound of copper produced before by-product revenues allows us and our investors to monitor our cost structure and helps us address operating management areas of concern.

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