Trevali Provides Mineral Reserves and Mineral Resources Statements; Outlines 2018 Exploration Plans

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VANCOUVER, British Columbia, April 16, 2018 (GLOBE NEWSWIRE) -- (“Trevali” or the “Company”) (TSX:TV) (BVL:TV) (OTCQX:TREVF) (Frankfurt:4TI) reports its mineral reserves and mineral resources statements as of December 31, 2017 and 2018 exploration plans.

Consolidated mineral reserves and mineral resources are tabulated below on a contained metal basis (Tables 1 and 2). Detailed breakdowns for each of the active mines (Santander, Caribou, Perkoa and Rosh Pinah) are provided by category on a grade-tonnage-contained metal basis in Tables 3 through 10. Mineral resources in this document are reported inclusive of mineral reserves.

Table 1. Total Mineral Reserves (Contained Metal) as of December 31, 2017

Table 2. Total Mineral Resources (Contained Metal) as of December 31, 2017

Table 3. Santander (Peru) Mineral Reserves as at December 31, 2017

Table 4. Santander (Peru) Mineral Resources as at December 31, 2017

(1) All mineral reserves have been estimated in accordance with the CIM Definition Standards. Numbers may not add due to rounding.(2) The technical report entitled “Mineral Reserve Estimation Technical Report for the Santander Zinc Mine, Province de Huaral, Perú” dated March 31, 2017, is the current technical report for the Santander property.(3) The Santander Magistral Underground Mine mineral resource estimate is reported based on net smelter return cut-off-value of US$40/tonne with metal prices of: US$1.16/lb zinc, US$0.91/lb lead, US$18.50/oz silver. The Santander Magistral Underground Mine mineral resource estimate has been prepared by the mine geology department and non-independent resource geology consultants to the Company with an effective date of December 31, 2017, under the supervision of and approved by Professional Geologist Aline Cote (OGQ), a Qualified Person as defined in NI 43-101. Ms. Cote is an employee of a related party to the Company and accordingly, is not independent.(4) The Santander Pipe Underground Deposit mineral resource estimate is reported based on Gross Metal Value cut-off-value of US$40/tonne with metal prices of: US$1.13/lb zinc, US$1.00/lb lead, US$18.00/oz silver. The Santander Pipe Underground Deposit mineral resource estimate was prepared and approved by Gilles Arseneau (P.Geo.), a consultant with Arseneau Consulting Services Inc, who is an independent Qualified Person as defined in NI 43-101, with an effective date of November 6, 2016.(5) The Santander Puajanca Underground Deposit mineral resource estimate is reported based on Gross Metal Value cut-off-value of US$40/tonne with metal prices of: US$1.15/lb zinc, US$0.95/lb lead, US$16.50/oz silver. The Santander Puajanca Underground Deposit mineral resource estimate was prepared and approved by Gilles Arseneau (P.Geo), a consultant with Arseneau Consulting Services Inc., who is an independent Qualified Person as defined in NI 43-101, with an effective date of November 6, 2016.

Table 5. Caribou (New Brunswick) Mineral Reserves as at December 31, 2017

(1) All mineral reserves have been estimated in accordance with the CIM Definition Standards. Numbers may not add due to rounding.(2) The Caribou Underground Mine mineral reserve estimate is reported based on optimized stopes designed on an incremental net smelter return cut-off-value of US$75/tonne with metal prices of: US$1.21/lb zinc, US$1.00/lb lead, US$18.50/oz silver, FX: US$/CAD$0.80. The Caribou Underground Mine mineral reserve has been prepared by the mine engineering department of the Company with an effective date of December 31, 2017. The Caribou Underground Mine mineral reserve has been reviewed and approved by Professional Engineer Torben Jensen (P.Eng.), a consultant with Roscoe Postle Associates Inc., who is an independent Qualified Person as defined in NI 43-101 and will be detailed in the technical report entitled “Technical Report on the Caribou Mine, New Brunswick Canada” to be dated April 12, 2018, which will be available under the Company’s profile on SEDAR at www.sedar.com within 45 days following the date of this news release.

Table 6. Bathurst Mining Camp (New Brunswick) Mineral Resources as at December 31, 2017

(1) All mineral resources have been estimated in accordance with the CIM Definition Standards.  Mineral resources are inclusive of mineral reserves.  Mineral resources that are not mineral reserves do not have demonstrated economic viability. Numbers may not add up due to rounding.(2) The Caribou Underground Mine mineral resource estimate is reported based on 5% zinc equivalent cut-off grade with metal prices of: US$1.21/lb zinc, US$1.00/lb lead, US$18.50/oz silver, FX: US$/CAD$0.80. The Caribou Underground Mine mineral resource estimate has been prepared by the mine geology department and non-independent technical consultants to the Company with an effective date of December 31, 2017. The Caribou Underground Mine mineral resource estimate has been reviewed and approved by Professional Geologist Ian Blakley (P.Geo), a consultant with  Roscoe Postle Associates Inc., who is an independent Qualified Person as defined in NI 43-101, and will be detailed in the technical report entitled “Technical Report on the Caribou Mine, New Brunswick Canada” to be dated April 12, 2018, which will be available under the Company’s profile on SEDAR at www.sedar.com within 45 days following the date of this news release.(3) The Halfmile Underground Project mineral resource estimate is reported based on 5% zinc equivalent cut-off grade with metal prices of: US$1.05/lb zinc, US$0.95/lb lead, US$20.00/oz silver, FX: US$/CAD$0.80. The Halfmile Underground Project mineral resource estimate was prepared and approved by Professional Geologist Gilles Arseneau (P.Geo.), a consultant with SRK Consulting (Canada) Inc., who is an independent Qualified Person as defined in NI 43-101, with an effective date of October 26, 2017.(4) The Stratmat Underground Project mineral resource estimate is reported based on 5% zinc equivalent cut-off grade with metal prices of: US$1.00/lb zinc, US$1.00/lb lead, US$21.15/oz silver, FX: US$/CAD$0.85. The Stratmat Underground Project mineral resource estimate was prepared and approved by Professional Geologist Gilles Arseneau (P.Geo.), a consultant with SRK Consulting (Canada) Inc., who is an independent Qualified Person as defined in NI 43-101, with an effective date of October 26, 2017.

Table 7. Perkoa (Burkina Faso) Mineral Reserves as at December 31, 2017

(1) All mineral reserves have been estimated in accordance with the CIM Definition Standards. Numbers may not add due to rounding. The mineral reserve is shown at 100% ownership; Trevali holds a 90% joint venture interest in the Perkoa mine.(2) The Perkoa Underground Mine mineral reserve estimate is reported based on planned stopes with an net smelter return cut-off-value of US$100/tonne with incremental stopes greater than US$80/tonne included based on individual financial analysis, metal prices of: US$1.20/lb zinc, FX: €/US$1.08. The Perkoa Underground Mine mineral reserve has been prepared by the mine engineering department of the Company with an effective date of December 31, 2017 and has been reviewed and approved by Professional Engineer Torben Jensen (P.Eng.), a consultant with Roscoe Postle Associates Inc., who is an independent Qualified Person as defined in NI 43-101 and will be detailed in the technical report entitled “Technical Report on the Perkoa Mine, Burkina Faso” to be dated April 12, 2018, which will be available under the Company’s profile on SEDAR at www.sedar.com within 45 days following the date of this news release.

Table 8. Perkoa (Burkina Faso) Mineral Resources as at December 31, 2017

(1) All mineral resources have been estimated in accordance with the CIM Definition Standards.  Mineral resources are inclusive of mineral reserves. Mineral resources that are not mineral reserves do not have demonstrated economic viability. Numbers may not add up due to rounding. The mineral resource is shown at 100% ownership, Trevali holds an 90% joint venture interest in the Perkoa mine.(2) The Perkoa Underground Mine mineral resource estimate is reported based on 5% zinc cut-off grade with metal prices of: US$1.20/lb zinc, FX: €/US$1.08. The Perkoa Underground Mine mineral resource estimate has been prepared by the mine geology department and non-independent technical consultants to the Company with an effective date of December 31, 2017 and has been reviewed and approved by Consulting Professional Geologist Ian Blakley (P.Geo.), a consultant with Roscoe Postle Associates Inc., who is an independent Qualified Person as defined in NI 43-101 and will be detailed in the technical report entitled “Technical Report on the Perkoa Mine, Burkina Faso” to be dated April 12, 2018, which will be available under the Company’s profile on SEDAR at www.sedar.com within 45 days following the date of this news release.

Table 9. Rosh Pinah (Namibia) Mineral Reserves as at December 31, 2017

(1) All mineral reserves have been estimated in accordance with the CIM Definition Standards. Numbers may not add due to rounding. The mineral reserve is shown at 100% ownership, Trevali holds an 80% joint venture interest in the Rosh Pinah mine.(2) The Rosh Pinah Underground Mine mineral reserve estimate is reported based on planned stopes with an net smelter return cut-off-value of US$66/tonne and incremental stopes greater than US$34/tonne, metal prices of: US$1.16/lb zinc, US$1.00/lb lead, US$18.18/oz silver, FX: NAD/US$ 13.30. The Rosh Pinah Underground Mine mineral reserve has been prepared by the mine engineering department of the Company with an effective date of December 31, 2017 and has been reviewed and approved by Professional Engineer Torben Jensen (P.Eng.), a consultant with Roscoe Postle Associates Inc., who is an independent Qualified Person as defined in NI 43-101 and will be detailed in the technical report entitled “Technical Report on the Rosh Pinah Mine, Namibia” to be dated April 10, 2018, which will be available under the Company’s profile on SEDAR at www.sedar.com within 45 days following the date of this news release.

Table 10. Rosh Pinah (Namibia) Mineral Resource as at December 31, 2017

(1) All mineral resources have been estimated in accordance with the CIM Definition Standards. Mineral resources are inclusive of mineral reserves. Mineral resources that are not mineral reserves do not have demonstrated economic viability. Numbers may not add up due to rounding. The mineral resource is shown at 100% ownership, Trevali holds an 80% joint venture interest in the Rosh Pinah mine.(2) The Rosh Pinah Underground Mine mineral resource estimate is reported based on 5% zinc equivalent cut-off grade with metal prices of: US$1.16/lb zinc, US$1.00/lb lead, US$18.18/oz silver, FX: NAD/US$ 13.30. The Rosh Pinah Underground Mine mineral resource estimate has been prepared by the mine geology department and non-independent technical consultants to the Company with an effective date of December 31, 2017 and has been reviewed and approved by Professional Geologist Ian Blakley (P.Geo.), a consultant with Roscoe Postle Associates Inc., who is an independent Qualified Person as defined in NI 43-101 and will be detailed in the technical report entitled “Technical Report on the Rosh Pinah Mine, Namibia” to be dated April 10, 2018, which will be available under the Company’s profile on SEDAR at www.sedar.com within 45 days following the date of this news release.

In 2017, the Company commenced an expanded and accelerated growth initiative at its four operating mines. The 2018 program forms part of a medium to long-range exploration strategy initially focused on brownfield and near-mine exploration targets. The primary aim is to expand and discover new mineral resources adjacent to existing mine infrastructure, to replace mined inventory, grow sustainable production, extend expected mine life and ultimately, contingent on success, provide production growth optionality to the operations.

The committed 2018 exploration budget has been increased from US$10 million to US$13 million, with additional success funding contingent on results, and programs will focus on:

For additional information on the Santander Mine, Peru, refer to the technical report entitled “Mineral Reserve Estimation Technical Report for the Santander Zinc Mine, Province de Huaral, Perú” dated March 31, 2017 which is available under the Company’s profile on SEDAR at www.sedar.com and on the Company’s website.

The shares of Trevali are listed on the TSX (symbol TV), the OTCQX (symbol TREVF), the Lima Stock Exchange (symbol TV), and the Frankfurt Exchange (symbol 4TI). For further details on Trevali, readers are referred to the Company’s website (www.trevali.com) and to Canadian regulatory filings on SEDAR at www.sedar.com.

On Behalf of the Board of Directors ofMark D. Cruise, President

These statements reflect the Company’s current views with respect to future events and are necessarily based upon a number of assumptions and estimates that, while considered reasonable by the Company, are inherently subject to significant business, economic, competitive, political and social uncertainties and contingencies. If any assumptions are untrue, it could cause actual results, performance or achievements to be materially different from future results, performance or achievements expressed or implied by such statements. Assumptions have been made regarding, among other things, present and future business strategies and the environment in which the Company will operate in the future, including commodity prices, anticipated costs and ability to achieve goals.

Forward-looking statements are subject to known and unknown risks, uncertainties and other important factors that may cause the Company’s actual results, level of activity, performance or achievements to be materially different from those expressed or implied by such forward-looking statements, including but not limited to: risks related to joint venture operations; fluctuations in spot and forward markets for silver, zinc, base metals and certain other commodities (such as natural gas, fuel oil and electricity); fluctuations in currency markets; risks related to the technological and operational nature of the Company’s business; changes in national and local government, legislation, taxation, controls or regulations and political or economic developments in Canada, the United States, Peru, Namibia, Burkina Faso, or other countries where the Company may carry on business in the future; risks and hazards associated with the business of mineral exploration, development and mining (including environmental hazards, industrial accidents, unusual or unexpected geological or structural formations, pressures, cave-ins and flooding); risks relating to the credit worthiness or financial condition of suppliers, refiners and other parties with whom the Company does business; inadequate insurance, or inability to obtain insurance, to cover these risks and hazards; employee relations; relationships with and claims by local communities and indigenous populations; availability and increasing costs associated with mining inputs and labour; the speculative nature of mineral exploration and development, including the risks of obtaining necessary licenses and permits and the presence of laws and regulations that may impose restrictions on mining; diminishing quantities or grades of mineral resources or mineral reserves as properties are mined; global financial conditions; business opportunities that may be presented to, or pursued by, the Company; the Company’s ability to complete and successfully integrate acquisitions and to mitigate other business combination risks; challenges to, or difficulty in maintaining, the Company’s title to properties and continued ownership thereof; the actual results of current exploration activities, conclusions of economic evaluations, and changes in project parameters to deal with unanticipated economic or other factors; increased competition in the mining industry for properties, equipment, qualified personnel, and their costs, as well as those factors discussed in the section entitled “Risk Factors” in the Company’s most recently filed annual information form. Investors are cautioned against attributing undue certainty or reliance on forward-looking statements. Although the Company has attempted to identify important factors that could cause actual results to differ materially, there may be other factors that cause results not to be as anticipated, estimated, described or intended. The Company does not intend, and does not assume any obligation, to update these forward-looking statements or information to reflect changes in assumptions or changes in circumstances or any other events affecting such statements or information, other than as required by applicable law.

We advise US investors that while the terms "measured resources", "indicated resources" and "inferred resources" are recognized and required by Canadian regulations, the US Securities and Exchange Commission does not recognize these terms. US investors are cautioned not to assume that any part or all of the material in these categories will ever be converted into reserves.

This news release does not constitute an offer to sell or a solicitation of an offer to buy any of the securities in the United States.  The securities described herein have not been and will not be registered under the United States Securities Act of 1933, as amended, or the securities laws of any state and may not be offered or sold within the United States, absent such registration or an applicable exemption from such registration requirements. 

The Caribou Mine located in New Brunswick Canada is operated by the 100% Trevali owned Trevali Mining (New Brunswick) Ltd. The mineral resource and mineral reserve will be detailed in the report entitled “Technical Report on the Caribou Mine, New Brunswick Canada” to be dated April 12, 2018, with an effective date of December 31, 2017 which was prepared for the Company by Roscoe Postle Associates Inc. (“RPA”).  RPA is not aware of any environmental, permitting, legal, title, taxation, socio-economic, marketing, political, or other relevant factors that could materially affect the mineral resource and mineral reserve estimates. 

Ian Ian Blakley P.Geo of  RPA  reviewed and verified information regarding drill sampling, data verification of all digitally-collected data, drill surveys and specific gravity determinations relating to the disclosure herein. The review encompassed quality assurance programs and quality control measures including analytical or testing practice, chain-of-custody procedures, sample storage procedures and included independent sample collection and analysis. This review found the information and procedures meet industry standards and are adequate for Mineral Resource and Mineral Reserve estimation and mine planning purposes. There were no limitations on the data verification process. In RPA’s opinion, the quality assurance and quality control (“QA/QC”) program, as designed and implemented by Trevali Mining (New Brunswick) Ltd. is adequate, and the assay results within the database are suitable for use in a mineral resource estimate.  The wireframes were modeled in Leapfrog Geo/Edge software with the interpretation constrained to represent the geology where necessary. Capping was performed for each metal by domain using cumulative distribution function analysis, one metre length composites were used.  The grade was estimated with ordinary kriging in three passes, by increasing size of the search ellipse in subsequent passes.  Pass 1 and 2 both require a minimum of three drill holes with a maximum of four samples per drill holes, pass 3 requires a minimum of two drill holes and a maximum of four samples per drill holes.  The grades were estimated in the block model in Leapfrog Geo/Edge software with 5 metre x 5 metre x 5 metre sized blocks with the row and column blocks sub blocked to 0.5 metre and a minimum height of 0.25 metres.  Mineral resource classification is based on the interpolation pass estimate attribute as well as the Qualified Person’s level of geological knowledge and information. Stoping voids were removed from the mineral resource estimate.  Specific gravity was measured on diamond drill core samples using a standard water displacement method. 

Mining shapes for the mineral reserve were initially designed by slicing the mineralized shells using Mineable Stope Optimizer in Deswick software, based on a net smelter return cut-off value of $75/tonne and a minimum mining width of 3.5 metres.  External dilution and mining recovery estimates were applied based on current mine performance by lens.  The net smelter return values based on average consensus forecast long-term prices of US$1.21/lb zinc, US$1.00/lb lead, US$18.50/oz silver at an exchange rate of $0.80 C$/US$.  Costs related to mining, processing, and G&A Mining and milling have been extracted from the forecasted 2018 operating costs, and include administration costs.  The average mining, milling, and maintenance cost over the Internal life of mine is US$59.00/t. This cost increases to US$65.42/t with the inclusion of surface sustaining capital and general and administrative costs for the underground operation. 

The Perkoa Mine located in Burkina Faso is operated by 90% Trevali owned Nantou Mining Burkina Faso S.A. (“Nantou Mining”).  The mineral resource and mineral reserve will be detailed in the report entitled “Technical Report on the Perkoa Mine, Burkina Faso” to be dated April 12, 2018, with an effective date of December 31, 2017 which was prepared for the Company by RPA. RPA is not aware of any environmental, permitting, legal, title, taxation, socio-economic, marketing, political, or other relevant factors that could materially affect the mineral resource and mineral reserve estimates.

Ian Blakley P.Geo of  RPA  reviewed and verified information regarding drill sampling, data verification of all digitally-collected data, drill surveys and specific gravity determinations relating to the disclosure herein. The review encompassed quality assurance programs and quality control measures including analytical or testing practice, chain-of-custody procedures, sample storage procedures and included independent sample collection and analysis. This review found the information and procedures meet industry standards and are adequate for Mineral Resource and Mineral Reserve estimation and mine planning purposes. There were no limitations on the data verification process.   In RPA’s opinion, the QA/QC program, as designed and implemented by Nantou Mining is adequate, and the assay results within the database are suitable for use in a mineral resource estimate.  The geological interpretation comprised wireframes for mineralization and lithological domains, which were developed using Surpac software. Drill hole assays are composited at a 1.5 metre length, a grade cap, which varied per domain, was applied.  A 5 metre x 5 metre x 5 metre block model was constructed which was then sub-blocked down to a minimum size of 1.25 metres. Search ellipsoids were used in the Ordinary Kriging interpolation in three passes.  For all passes the minimum number of assays is seven with a maximum of six from a single drill hole.  Specific gravity was measured on diamond drill core samples using a standard water displacement method.  Mineral resource classification is based on the interpolation pass estimate attribute as well as the Qualified Person’s level of geological knowledge and information.  Following estimation and classification, the block model was depleted using the actual development and stoping voids, any “unrecoverable” areas are completely sterilized, and extracted from the mineral resource estimate.

The mineral reserve uses zinc metal price assumption of US$1.20/lb and a €/US$ exchange rate of 1.08, based on average long term price for the next five years.  Metallurgical recovery and concentrate grade assumptions are based on the 2017 actual results.  Mining and milling costs used for the mineral reserve net smelter return calculation have been extracted directly from the actual 2017 operating costs, and include all operating costs and administration costs.  The average mining, milling, and maintenance cost over the Internal life of mine is US$80.00/t. This cost increases to US$102.80/t with the inclusion of surface sustaining capital and general and administrative (G&A) costs for the underground operation.  Stope shapes are designed manually using Surpac software respecting a net profit given the expected material revenue, and the cost per tonne (long term net smelter return >$100), or each stope must prove itself to be profitable to mine based on an individual financial analysis.  Any internal waste is added to the resource tonnage at zero grade plus an additional 15% unplanned dilution is then added and then a 95% recovery is applied.

The Rosh Pinah Mine located in Namibia is operated by the 80% Trevali owned Rosh Pinah Zinc Corporation (Proprietary) Limited (“RPZC”).  The mineral resource and mineral reserve will be detailed in the report entitled “Technical Report on the Rosh Pinah Mine, Namibia” to be dated April 10, 2018, with an effective date of December 31, 2017 which was prepared for the company by Roscoe Postle Associates Inc. (RPA.).  RPA is not aware of any environmental, permitting, legal, title, taxation, socio-economic, marketing, political, or other relevant factors that could materially affect the mineral resource and mineral reserve estimates. 

Ian Blakley P.Geo of  RPA  reviewed and verified information regarding drill sampling, data verification of all digitally-collected data, drill surveys and specific gravity determinations relating to the disclosure herein. The review encompassed quality assurance programs and quality control measures including analytical or testing practice, chain-of-custody procedures, sample storage procedures and included independent sample collection and analysis. This review found the information and procedures meet industry standards and are adequate for Mineral Resource and Mineral Reserve estimation and mine planning purposes. There were no limitations on the data verification process.   In RPA’s opinion, the QA/QC program, as designed and implemented by RPZC is adequate and the assay results within the database are suitable for use in a mineral resource estimate.  The Rosh Pinah mineral resources are presented as a series of discrete lenses that are interconnected along the mineralized horizon with four primary lenses, (EOF, SF1, SF3, and WF3).  For the WF3 lens separate high and low grade domains were identified with leapfrog software and modeled separated with hard boundaries.  Composites were extracted in MineSight software at 1.5 metre composite lengths, capping was applied.  The block model uses blocks of size of 5 metres x 5 metres x 5 metres, which is then sub-blocked down to a minimum size of 1.25 metres at domain boundaries.  All estimates are prepared using a three pass approach and estimated using ordinary kriging, the pass number aids in resource classification.  An overall default bulk density factor of 3.21 t/m is applied for WF3 lens to calculate the overall tonnage.

The mineral reserve estimate takes into consideration metallurgical recoveries, concentrate grades, transportation costs, smelter treatment charges, and royalty in determining economic viability.  Datamine software’s Mineable Stope Optimizer was used to determine an array of potentially mineable stope shapes per level based on a selection of cut-off grades as determined using a Basic Mining Equation that captures the full cost of the mining operation including mining, processing, shipping, and smelting costs.  The average operating cost, excluding capital, is US$48.79 per tonne. This cost increases to US$65.70 per tonne with the inclusion of sustaining capital costs for the underground operation.  Revenue of any given parcel of material is calculated using a net smelter return equation. Net smelter return is the net revenue received by the mine from the sale of the zinc, lead, and silver metal less transportation and processing costs.  The net smelter return calculation uses metal prices of US$1.16/lb zinc, US$1.00/lb lead, US$18.18/oz silver, FX: NAD/US$ 13.30. Past experience has been used to produce realistic dilution and mining recovery per phase of mining.

 

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