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Trevali intersects multiple broad intervals of high-grade zinc at the Santander Pipe target – system remains open for expansion






Trevali Mining (TSX:TV) (LMA:TV) (OTCQX:TREVF) (FRANKFURT:4TI) announces results from its 2017 exploration program where directional diamond drilling continues to intersect multiple zones of high-grade zinc mineralization within and below the Santander Pipe target at its Santander Zinc Mine in Peru (Table 1, Figures 1 & 2).



Hole ID Depth From – To
Core Length
Interval* (metres)
Zn (%) Pb (%) Cu (%) Ag (g/tonne)
SAN-0224-17 792.45 – 803.40 10.95 7.45 0.01 0.15 7.45
incl. 792.45 – 795.70 3.25 14.75 0.01 0.33 14.1
incl. 801.40 – 803.40 2 12.92 0.01 0.15 8.26
SAN-0225-17 556.95 – 621.55 64.6 7.26 0.04 0.10 12.24
incl. 557.80 – 567.35 9.55 11.31 0.05 0.14 20.52
incl. 615.05 – 621.55 6.5 20.38 0.01 0.43 18.48
SAN-0225B-17** 550.70 – 551.75 1.05 3.05 0.30 0.01 29.86
556.45 – 583.45 27 6.06 0.02 0.10 6.37
incl. 561.80 – 574.20 12.4 10.07 0.01 0.17 7.40
783.00 – 789.90 6.9 17.2 0.01 0.17 7.07
SAN-0225C-17 543.60 – 547.85 4.25 2.20 1.43 0.05 31.60
556.55 – 590.50 33.95 6.35 0.01 0.13 8.03
incl. 565.50 – 579.40 13.9 10.36 0.01 0.23 8.40
767.40 – 769.65 2.25 6.01 0.01 1.08 61.14
SAN-0226-17 349.70 – 379.40 29.7 7.94 0.31 0.25 33.01
incl. 370.15 – 379.40 9.25 10.36 0.04 0.32 25.60
SAN-0226B-17 348.35 – 364.05 15.7 3.54 3.82 0.12 22.44
incl. 358.20 – 364.05 5.85 7.31 7.58 0.22 38.72
375.05 – 386.20 11.15 3.18 3.21 0.07 16.14
396.75 – 410.55 13.8 3.96 0.65 0.24 41.69
incl. 396.75 – 401.65 4.9 8.34 0.97 0.29 54.71
423.85 – 468.00 44.15 3.26 0.08 0.26 31.89


Table 1: Summary drill hole assay results – Santander Pipe; *length and specific gravity weighted composites. True width is estimated at approximately 70-90% of reported interval. ** 0XXB-XX designates a daughter hole wedged off respective parent / mother hole.   



“From our initial discovery drill hole in February 2008, Trevali has enjoyed almost 10-years of accretive resource growth and replacement at Santander. Given the coarse style of the mineralization, absence of significant amounts of barren sulphide and location immediately adjacent to the mine infrastructure, the Santander Pipe forms a compelling high-priority target,” stated Dr. Mark Cruise, Trevali’s President and CEO. “The exploration team currently has two surface and two underground drill rigs expanding the mineralized system which remains to be fully delineated.”



To view the figure associated with this release (Map of the Santander property showing the Magistral deposits, the Santander Pipe target and a portion of Trevali’s 17-km long, prospective exploration trends), please click on the following link: http://media3.marketwire.com/docs/TV_Figure_1.pdf


To view the figure associated with this release (Longitudinal Section (Looking East) of Magistral Deposits, Puajanca and Santander Pipe targets), please click on the following link: http://media3.marketwire.com/docs/TV_Figure_2.pdf






The Santander Pipe was continuously mined between 1957 and 1991 to a vertical depth of 480 metres below ground surface. Based on historical mine records the Pipe produced 7,993,105 tonnes of ore grading 10.88% Zn, 0.98% Pb, 0.31% Cu and 2.1 oz/t Ag during this period. Due to a combination of low commodity prices coupled with a general lack of development, mining ceased in high-grade mineralization and remains open for expansion at depth.



In 2011 Trevali completed five drill holes to compare and confirm the presence of mineralization versus historic drill results at the mid-levels of the Pipe. All holes intersected broad zones of mineralization (up to approx. 100 metres at 2.73% Zn) adjacent to and within the historic workings, within which are shorter high-grade intervals (See News Release TV-NR-11-19 June 21, 2011 for details):


  • 11.25 metres grading 7.24% Zn, 0.49% Pb and 94.9 g/t Ag
  • 9.5 metres grading 8.88 % Zn, 0.64% Pb and 41.4 g/t Ag
  • 7.1 metres grading 14.15% Zn, 0.74% Pb and 135.9 g/t Ag



The Santander Pipe target, as currently defined, is a roughly cylindrical body with a diameter of approximately 120 metres. Mineralization in the upper half of the Pipe, from 0-to-230-metres below ground surface, is hosted within the Jumasha and Pariatambo limestones while the lower half occurs within more favorable and reactive limestones of the Chulec Formation (Figure 3).



In the upper half of the Pipe, massive to semi-massive sphalerite with accompanying silver-rich (argentiferous) galena, pyrrhotite and minor chalcopyrite mineralization occurs as an annular ring 6-20 metres thick surrounding a central stock of lower grade garnetiferous skarn and disseminated sulphides that typically range from 0.5 to 4.0% Zn and 0.4 to 1.5 oz/t Ag. Sulphide mineralization in the lower half of the Pipe (from 230 to plus-440 metres below ground surface) occurs as manto replacement bodies between 5 to 25 metres thick, similar to those reported here (Figure 3).



The high-grade mineralization within the Pipe is defined as robust and is controlled by an interplay of structure, favorable host lithology (clean and/or porous limestone units), and proximity to the primary fluid pathways. Based on results to date it represents a very attractive target capable of rapidly adding significant tonnages at relatively high zinc grades.



To view the figure associated with this release (Schematic diagram of mineralization in former Santander Pipe mining operation), please click on the following link: http://media3.marketwire.com/docs/TV_Figure_3.pdf






The first two holes testing the Pipe, SAN-0224 and SAN-0225, were designed to test the southern and central portions of the target respectively. As anticipated both holes intersected intense skarn alteration prior to intersecting broad zones of disseminated to massive zinc rich replacement mineralization.



SAN-0225B and SAN-0225C are daughter holes branching off the parent hole SAN-0225. They were designed to provide resource definition and confirm continuity of the mineralization encountered in SAN-0225 in the central portion of the currently defined Pipe.



SAN-0226, and daughter hole SAN-0226B, were designed to test the mineralization within the lower mine levels of pipe target, at similar vertical levels to currently defined Magistral mineralization, which also remains open for expansion (Figure 4).



To view the figure associated with this release (Sections (N-S and W-E) through the Santander Pipe highlighting significant intersections as discussed in the text), please click on the following link: http://media3.marketwire.com/docs/TV_Figure_4.pdf



Mineralization intersected in these holes is primarily sphalerite (+/- chalcopyrite) hosted within an intense garnet alteration halo. The relatively low quantities of barren sulphide gangue (pyrite and pyrrhotite) is anticipated to result in high recoveries and to produce a very clean zinc concentrate making the Pipe target metallurgically attractive. Several of the drill holes have also intersected late, lead and silver rich veins that cut earlier zinc mineralization. Additional drilling is required to understand the importance and geometry of these vein systems but as seen at the Magistral deposits they can form attractive high-grade targets in and of themselves.






For the remainder of 2017 additional exploration drilling will continue to test targets in and around the Santander Pipe. Surface drilling will also follow up on a variety of near-mine high priority targets along the two primary mineralization trends on the property (Figures 1 and 2). The underground drill program is advancing well at the Magistral bodies and is anticipated to expand the inferred resource in addition to upgrading inferred tonnages to measured and indicated status for future mine planning as part of Santander’s rolling mine plan strategy.






On November 6, 2017 Trevali announced the results of a Preliminary Economic Assessment for Halfmile-Stratmat massive sulphide zinc-lead-silver deposits in the Bathurst mining camp of New Brunswick, Canada.



Under the base case PEA both the Halfmile and Stratmat deposits are fed to a new 3,000-tonne-per-day concentrator plant located at the Stratmat site. Results indicate positive economics with a preproduction capital expenditure of $231-million, a post-tax internal rate of return of 19 per cent, post-tax net present value (NPV) of $99-million at an 8-per-cent discount rate, a mine life of 13 years with peak annual payable production of approximately 117 million pounds zinc, 35 million pounds lead, two million pounds copper and 766,000 ounces silver. The alternative case PEA examined the feasibility of transporting preconcentrated dense media feed (DMS) to the company’s Caribou concentrator plant. This study indicates economic results with an estimated preproduction capital expenditure of $156-million, a post-tax IRR of 25 per cent, post-tax NPV of $116-million at an 8-per-cent discount rate.



Trevali has filed, both on SEDAR and its website, the technical report entitled “Technical Report on Preliminary Economic Assessment for the Halfmile-Stratmat Massive Sulphide Zinc-Lead-Silver Integrated Project Bathurst, New Brunswick, Canada” completed by SRK Consulting (Canada) Inc. and dated effective October 26, 2017.



Qualified Person and Quality Control/Quality Assurance



EurGeol Dr. Mark D. Cruise, Trevali’s President and CEO and Daniel Marinov, P.Geo, Trevali’s VP Exploration, are qualified persons as defined by NI 43-101, have supervised the preparation of the scientific and technical information that forms the basis for this news release. Mr. Marinov is responsible for all aspects of the work, including the quality control/quality assurance programs. Dr. Cruise is not independent of the Company, as he is an officer, director and shareholder. Mr. Marinov is not independent of the Company as he is an officer and shareholder. Drill core samples were processed and assayed in the Santander mine onsite laboratory. Zinc, lead and silver, assays were obtained by Aqua-Regia dissolution followed by Atomic Absorption measurement. Values of lead and zinc over 15% are assayed by volumetric method. Analytical accuracy and precision are monitored by the analysis of reagent blanks, reference material and replicate samples. Quality control is further assured by the use of international and in-house standards. Blind certified reference material is inserted at regular intervals into the sample sequence by Trevali personnel in order to independently assess analytical accuracy. The onsite laboratory is outsourced and managed by SGS-Peru personnel. SGS-Peru’s quality system complies with the requirements for the International Standards ISO 9001:2000 and ISO 17025: 1999. Finally, representative blind duplicate samples are routinely forwarded to an ISO compliant third-party laboratory for external quality control.






Trevali is a zinc-focused, base metals mining company with four commercially producing operations.



The Company is actively producing zinc concentrates from its wholly-owned Santander mine in Peru, the wholly-owned Caribou mine in the Bathurst Mining Camp of northern New Brunswick, its 80% owned Rosh Pinah mine in Namibia and its 90% owned Perkoa mine in Burkina Faso.


Posted December 5, 2017

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