Compañía de Minas Buenaventura S.A.A. announced preliminary production results for the fourth quarter and full year of 2017. For the quarter, the company's gold production was 50,056 Oz. from Orcopampa, 27,605 Oz. from Tambomayo, 30,648 Oz. from La Zanja, 45,164 Oz. from Tantahuatay and 134,291 Oz. from Yanacocha. Silver production was 4,129,464 Oz. from Uchucchacua, 292,358 Oz. from Julcani, 192,004 Oz. from Mallay, 814,012 Oz. from Tambomayo and 1,047,414 Oz. from El Brocal. Zinc production was 10,785 MT from El Brocal, 4,318 MT from Uchucchacua, 1,281 Oz. from Mallay and 2,086 MT from Tambomayo. Copper production was 12,103 MT from El Brocal.

For the year, the company's gold production was 190,976 Oz. from Orcopampa, 64,175 Oz. from Tambomayo, 127,118 Oz. from La Zanja, 151,454 Oz. from Tantahuatay and 534,691 Oz. from Yanacocha. Silver production was 16,583,698 Oz. from Uchucchacua, 2,249,527 Oz. from Julcani, 1,109,382 Oz. from Mallay, 1,788,219 Oz. from Tambomayo and 4,084,249 Oz. from El Brocal. Zinc production was 51,511 MT from El Brocal, 13,040 MT from Uchucchacua, 7,102 Oz. from Mallay and 2,906 MT from Tambomayo. Copper production was 45,097 MT from El Brocal.

For the year 2018, the company expects gold production from Orcopampa to be in the range of 190,000 Oz. to 210,000 Oz., Tambomayo to be in the range of 110,000 Oz. to 130,000 Oz., La Zanja to be in the range of 70,000 Oz. to 80,000 Oz., Tantahuatay to be in the range of 160,000 Oz. to 180,000 Oz., and Yanacocha to be in the range of 470,000 Oz. to 545,000 Oz. Silver production expects from Uchucchacua to be in the range of 17.2 million Oz. to 18.6 million Oz., Julcani expects to be in the range of 2.1 million Oz. to 2.4 million Oz., Mallay expects to be in the range of 0.4 million Oz. to 0.5 million Oz., Tambomayo expects to be in the range of 3.0 million Oz. to 3.5 million Oz., and El Brocal expects to be in the range of 4.2 million Oz. to 4.8 million Oz. Zinc production expects from El Brocal to be in the range of 43,000 MT to 50,000 MT, Uchucchacua to be in the range of 16,600 MT to 18,300 MT, Mallay to be in the range of 3,000 MT to 3,600 MT and Tambomayo to be in the range of 7,000 MT to 8,000 MT. Copper production expects from El Brocal to be in the range of 61,000 MT to 71,000 MT.

For the quarter, the company sold gold volume of 55,812 Oz. from Orcopampa, 31,491 Oz. from Tambomayo, 30,285 Oz. from La Zanja and 47,580 Oz. from Tantahuatay. Silver sales volume was 3,747,035 Oz. from Uchucchacua, 330,359 Oz. from Julcani, 211,609 Oz. from Mallay, 884,088 Oz. from Tambomayo and 846,928 Oz. from El Brocal. Zinc sales volume was 9,285 MT from El Brocal, 3,692 MT from Uchucchacua, 1,153 Oz. from Mallay and 1,906 MT from Tambomayo. Copper sales volume was 11,566 MT from El Brocal.

For the year, the company sold gold volume of 195,278 Oz. from Orcopampa, 63,130 Oz. from Tambomayo, 128,623 Oz. from La Zanja and 151,797 Oz. from Tantahuatay. Silver sales volume was 15,583,553 Oz. from Uchucchacua, 2,466,846 Oz. from Julcani, 993,040 Oz. from Mallay, 1,621,611 Oz. from Tambomayo and 3,253,899 Oz. from El Brocal. Zinc sales volume was 43,120 MT from El Brocal, 10,281 MT from Uchucchacua, 5,926 Oz. from Mallay and 2,398 MT from Tambomayo. Copper sales volume was 42,633 MT from El Brocal.