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Trevali Mining update on Santander Zinc Mine

Mining News - Published on Thu, 07 Dec 2017

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Trevali Mining Corporation announced 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.

Dr Mark Cruise, Trevali's President and CEO stated that "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."He added that "The exploration team currently has two surface and two underground drill rigs expanding the mineralized system which remains to be fully delineated."

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:

1. 11.25 metres grading 7.24% Zn, 0.49% Pb and 94.9 g/t Ag

2. 9.5 metres grading 8.88 % Zn, 0.64% Pb and 41.4 g/t Ag

3. 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.

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.

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.

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Posted By : Rabi Wangkhem on Thu, 07 Dec 2017
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