Engineering & Mining Journal

JUL 2019

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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NEWS - CONTINUED 18 E&MJ • JULY 2019 ru), and Sona Hill (4.9 km southeast of Toroparu). Mining operations are planned to begin during the second year of con- struction at a rate of 8 million mt/y, in- creasing to 20 million mt/y by production year three, 32 million mt/y by year 10, and 42 million mt/y by year 15. Material containing higher sulphides will be stockpiled for feed into the flotation circuit beginning in year 11. Rehandling of stockpiled mineralized material will be ac- complished with wheel loaders and trucks. Production in years 23 and 24 is planned to be from stockpile rehandling only. "The re-scoping study shows the signif- icant changes to the profile of the Toroparu project that have occurred since the 2013 prefeasibility study was issued," Sand- spring CEO Rich Munson said. "With a reduction of preproduction capex by more than $120 million, an increase in total gold production, and an upfront monetary deposit based on a precious-metals pur- chasing agreement with Wheaton Precious Metals, the economics of the re-scoped project compare favorably to those of the 2013 prefeasibility study even though they are modeled at a gold price that is $100/oz less than the 2013 prefeasibility study." Los Andes Studying Major Development at Vizcachitas Los Andes Copper has announced posi- tive results from an updated preliminary economic assessment (PEA) of its 100% owned Vizcachitas project in central Chile. The study describes an open-pit mine and concentrator producing sep- arate copper and molybdenum concen- trates. Three potential mill throughputs were evaluated: 55,000 metric tons per day (mt/d), 110,000 mt/d, and 200,000 mt/d. The 110,000-mt/d scenario pro- duced the most favorable results and is being advanced to a prefeasibility study (PFS), which is planned for completion at the end of 2020. Capital costs to develop the 110,000- mt/d project are estimated at about $1.9 billion. Initial production is currently planned to begin near the end of 2024. Payback period from initial production is estimated at 3.4 years. Los Andes Executive Chairman Fernan- do Porcile said, "We are delighted with the results of this PEA, which highlight the significant opportunity that the Vizcachitas project presents and which we believe will be Chile's next major copper mine … "Vizcachitas currently has a signifi- cant measured and indicated resource of 1.284 billion mt at a copper equiva- lent grade of 0.45%, and production of 110,000 mt/d will only see half of the resource depleted by the end of the mine life. Additionally, the mineralization is open at depth and to the north, and Los Andes holds a significant land package in the district, meaning that there is poten- tial to increase the resource substantially. The Vizcachitas PEA was prepared by Tetra Tech Chile S.A. Endeavour Silver Gets Final Tailings Permit for Terronera Endeavour Silver Corp. recently received the final tailings permit for the Terronera silver-gold mine project in Jalisco state, Mexico. The Authorization to Change Soil Use on Forest Land, or ETJ permit, was issued by the Mexican Ministry of Envi- ronment (SEMARNAT). Endeavour Silver now has the right to store tailings from the Terronera high-grade, underground, silver-gold mine in a secure, filtered dry- stack tailings facility adjacent to the pro- posed plant site. According to the company, dry-stack tailings facilities cost more to build and operate than conventional wet tailings fa- cilities, but are safer and "greener" and represent the future of tailings storage. Now that the Terronera mine project is fully permitted, Endeavour Silver plans to complete a final improved prefeasibility study in the third quarter and arrange ap- propriate financing to build Endeavour's next core asset. Following an estimated 18-month construction period, the Terronera mine is expected to produce more than 5-mil- lion-oz silver equivalents (at an 80:1 sil- ver:gold ratio) over a minimum 12 year mine life, at an all-in sustaining cost per oz of silver produced in the lowest quar- tile of industry peers. NEWS - CALENDAR OF EVENTS AUGUST 27-29, 2019: AIMEX, Sydney Showgrounds, Sydney, Australia. Contact: Web: SEPTEMBER 6-7, 2019: Annual Meeting of the Mining Electrical Maintenance and Safety Association, Sheraton Sand Key, Clearwater Beach, Florida. Contact: Web: SEPTEMBER 9-12, 2019: Exposibram, the Brazilian Mining Expo & Congress, Expominas, Belo Horizonte, Brazil. Contact: Web: SEPTEMBER 16-20, 2019: 37 th International Conference and Exhibition of ICSOBA, Krasnoyarsk, Russia. Contact: Web: SEPTEMBER 16-20, 2019: Perumin, Centro de Convenciones Cerro Juli, Arequipa, Peru. Contact: Web: OCTOBER 9-10, 2019: China Mining 2019, Tianjin Meijiang Conven- tion Center, Tianjin, Peoples Republic of China. Contact: Web: OCTOBER 22-25, 2019: Convencion Internacional de Mineria, Mundo Imperial Acapulco, Mexico. Contact: Web: OCTOBER 30-NOVEMBER 2, 2019: China Coal & Mining Expo, New China International Exhibition Center, Beijing, China. Contact: Web: NOVEMBER 6-9, 2019: International Mining Exhibition (IME) 2019, EcoPark, Kolkata, India. Contact: Web: NOVEMBER 19-20, 2019: Smart Mining Conference, Tivoli Conference Center, Aachen, Germany. Contact: Web: DECEMBER 2-6, 2019: The 2019 American Exploration & Mining Association annual meeting, Nugget Casino Resort, Sparks, Nevada, USA. Contact: Web: (Regional News-Latin America - from p. 12)

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